阅读说明：本技术 泡沫钛基底上生长氧化铁纳米棒阵列材料及其制备方法 (Iron oxide nanorod array material grown on foamed titanium substrate and preparation method thereof ) 是由 李睿智 李荣聪 张灵 周盈科 于 2020-11-12 设计创作，主要内容包括：本发明涉及一种泡沫钛基底上生长氧化铁纳米棒阵列材料及其制备方法。其技术方案是：按硫酸钠∶六水合氯化铁∶去离子水的物质的量比为7∶7∶7800配料,在室温条件下搅拌,得混合溶液。将所述混合溶液转移到高压反应釜中,再将经洗洁精、乙醇和用去离子水超声清洗过的泡沫钛浸入到混合溶液中,在160～170℃条件下保温4～7h,得前躯体。将所述前躯体置于管式气氛炉,在氩气气氛中于430～470℃条件下保温2～3h,制得泡沫钛基底上生长氧化铁纳米棒阵列材料。本发明工艺简单、环境友好和易于工业化生产,所制制品比容量高、倍率性能好和循环稳定性优异。(The invention relates to an iron oxide nanorod array material growing on a foamed titanium substrate and a preparation method thereof. The technical scheme is as follows: the materials are mixed according to the mass ratio of sodium sulfate, ferric chloride hexahydrate and deionized water of 7: 7800, and stirred at room temperature to obtain a mixed solution. And transferring the mixed solution into a high-pressure reaction kettle, immersing the foamed titanium ultrasonically cleaned by the detergent, the ethanol and the deionized water into the mixed solution, and preserving the heat for 4-7 hours at the temperature of 160-170 ℃ to obtain a precursor. And (3) placing the precursor in a tubular atmosphere furnace, and preserving heat for 2-3 h at the temperature of 430-470 ℃ in an argon atmosphere to obtain the iron oxide nanorod array material growing on the foamed titanium substrate. The method has the advantages of simple process, environmental protection and easy industrial production, and the prepared product has high specific capacity, good rate performance and excellent cycle stability.)

1. A preparation method for growing iron oxide nanorod array material on a foamed titanium substrate is characterized by comprising the following steps:

(1) mixing materials according to the mass ratio of sodium sulfate, ferric chloride hexahydrate and deionized water of 7: 7800, and stirring at room temperature to obtain a mixed solution;

(2) ultrasonically cleaning titanium foam for 15-30 min by using a detergent, ultrasonically cleaning for 15-30 min by using ethanol and ultrasonically cleaning for 15-30 min by using deionized water in sequence, then immersing the cleaned titanium foam into a reaction kettle containing the mixed solution, carrying out hydrothermal reaction for 4-7 h at 160-170 ℃, and naturally cooling to room temperature;

(3) washing the naturally cooled titanium foam with deionized water for 2-3 times, and drying at 60-80 ℃ for 6-8 h to obtain a precursor;

(4) placing the precursor in a tubular atmosphere furnace, heating to 430-470 ℃ at a speed of 5-10 ℃/min under the protection of argon, preserving heat for 2-3 h, and naturally cooling to obtain the iron oxide nanorod array material growing on the titanium foam substrate;

the iron oxide nanorods of the iron oxide nanorod array material grown on the titanium foam substrate are combined with titanium foam with a three-dimensional pore structure to form a three-dimensional structure with nested titanium foam pores and tightly arranged iron oxide nanorods.

2. The method for preparing the iron oxide nanorod array material on the titanium foam substrate according to claim 1, wherein the sodium sulfate is analytically pure.

3. The method for preparing a nano-rod array material of iron oxide grown on a titanium foam substrate according to claim 1, wherein the ferric chloride hexahydrate is analytically pure.

4. The method for preparing the material of the foam titanium substrate with the iron oxide nanorod array grown thereon according to claim 1, wherein the foam titanium is in a strip shape and has a purity of 99.95% or more.

5. A method for growing iron oxide nanorod array material on a titanium foam substrate, characterized in that the iron oxide nanorod array material on the titanium foam substrate is the iron oxide nanorod array material on the titanium foam substrate prepared by the method for preparing the iron oxide nanorod array material on the titanium foam substrate according to any one of claims 1-4.

Technical Field

The invention belongs to the technical field of iron oxide nanorod array composite materials. In particular to an iron oxide nanorod array material grown on a foamed titanium substrate and a preparation method thereof.

Background

Environmental problems associated with the consumption of fossil energy have accelerated the widespread research of people on new types of energy and high efficiency conversion storage devices. The super capacitor has a series of advantages of high power density, high charging and discharging speed, long cycle life, environmental friendliness and the like, and becomes a novel green energy storage device with the greatest prospect in the fields of portable electronic equipment, new energy and the like. Meanwhile, the selection and preparation of the electrode material are the key points which directly influence the electrochemical performance of the super capacitor. The electrode materials currently developed and researched mainly include carbon materials, metal oxides and conductive polymers, wherein the metal oxides are the most promising electrode materials for the super capacitor due to high specific capacity.

Among the numerous metal oxides, iron oxides have the following advantages: 1. the valence state is multiple, the redox activity is high, and the theoretical capacity is high; 2. a stable and large negative working range is provided; 3. safe, nontoxic and environment-friendly; 4. widely distributed and cheap (Fe)₂O₃<And 1/kg), is easy to be put into commercial mass production, and becomes an ideal electrode material of the super capacitor. However, the activity of iron oxides is dependent on surface or near-surface redox reactions, the performance of which is determined by charge transport kinetics, and it is difficult to obtain theoretically predicted high capacitances in practice.

At present, people still have some defects although researches on modification methods such as nanostructure design, composition, element doping, phase/defect regulation and the like are carried out to improve the electrochemical performance of the iron oxide to a certain extent.

Core-shell structure Fe₂O₃Preparation method of @ PPy composite material and application of @ PPy composite material in supercapacitor "(CN 1105)26299A) The patent technology comprises directly growing ZnO nano-array by solvothermal method, and hydrothermal treating the obtained ZnO nano-array to obtain MnO₂Nanotube array of MnO₂Placing the nanotube array in mixed solution of ferrous sulfate heptahydrate for hydrothermal treatment, drying, and calcining in a muffle furnace to obtain Fe₂O₃A nanotube array; finally mixing Fe₂O₃The nanotube array is put into an aqueous solution containing pyrrole and p-toluenesulfonic acid, then ammonium persulfate solution is slowly dripped into the nanotube array, ice bath is carried out, and Fe is obtained after drying₂O₃The @ ppy nanotube array has complicated experimental steps and is difficult to realize industrialization.

Xulongqu culvert et al (C. -H.xu et al₂O₃Fe produced from/CNT compositions for supercapacitor application, J.alloys.Comp.676(2016)469-473)₂O₃The specific capacity of the/N-CNT is also lower, and reaches only 54F g at the sweep rate of 1mV/s^-1。

' A kind of Fe₂O₃The patent technology of the nanometer rod array electrode in-situ sulfuration and carbon coating (CN 106848301B) uses a titanium sheet as a substrate, and prepares Fe through in-situ sulfuration and coating by a hydrothermal method₂O₃the-S @ C is poor in rate capability, and meanwhile, when carbon coating is carried out, methane is used as a carbon source, so that the environment is influenced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and aims to provide a preparation method for growing iron oxide nanorod array materials on a foamed titanium substrate, which has the advantages of simple process, convenient operation, environmental friendliness and easy industrial production.

In order to achieve the purpose, the invention adopts the following technical scheme:

(1) the materials are mixed according to the mass ratio of sodium sulfate, ferric chloride hexahydrate and deionized water of 7: 7800, and stirred at room temperature to obtain a mixed solution.

(2) And ultrasonically cleaning the titanium foam for 15-30 min by using a detergent, ultrasonically cleaning for 15-30 min by using ethanol and ultrasonically cleaning for 15-30 min by using deionized water in sequence, immersing the cleaned titanium foam into a reaction kettle containing the mixed solution, carrying out hydrothermal reaction for 4-7 h at 160-170 ℃, and naturally cooling to room temperature.

(3) Washing the naturally cooled titanium foam with deionized water for 2-3 times, and drying at 60-80 ℃ for 6-8 h to obtain a precursor.

(4) And (3) placing the precursor in a tubular atmosphere furnace, heating to 430-470 ℃ at the speed of 5-10 ℃/min under the protection of argon, preserving the temperature for 2-3 h, and naturally cooling to obtain the iron oxide nanorod array material growing on the foamed titanium substrate.

The iron oxide nanorods of the iron oxide nanorod array material grown on the titanium foam substrate are combined with titanium foam with a three-dimensional pore structure to form a three-dimensional structure with nested titanium foam pores and tightly arranged nanorods.

The sodium sulfate is analytically pure.

The ferric chloride hexahydrate is analytically pure.

The foamed titanium is in a strip shape, and the purity of the foamed titanium is more than 99.95%.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, firstly, foamed titanium is subjected to ultrasonic cleaning by using detergent, ethanol and deionized water in sequence, then hydrothermal reaction is carried out at 160-170 ℃ to obtain a precursor, and then the precursor is subjected to argon heat treatment to obtain the iron oxide nanorod array material grown on the foamed titanium substrate, so that the process is simple.

(2) The invention has no toxic gas release in the reaction process, and the Na discharged after the reaction is finished₂SO₄And FeCl₃·6H₂The O mixed waste liquid has little pollution to the environment and is green and environment-friendly. The iron source for preparing the ferric oxide has low price, the equipment required by the production process is simple, and the production cost is low.

(3) The iron oxide nanorods in the iron oxide nanorod array material grown on the foamed titanium substrate prepared by the invention are closely arranged on the substrate. Firstly, the contact area of unit mass electrode/electrolyte can be increased by material nanocrystallization, so that more reaction sites are generated, secondly, the ordered nanorod array structure is most effective in the aspect of reaction kinetics, and the provided fast and direct electron transport channel can shorten the transport path of electrolyte ions and electrons, so that larger capacitance and higher rate performance are obtained.

(4) The iron oxide nanorods of the iron oxide nanorod array material grown on the foam titanium substrate prepared by the invention are combined with the foam titanium with a three-dimensional pore structure to form the three-dimensional material formed by nesting and growing the iron oxide nanorod array and the foam titanium substrate. The three-dimensional porous structure can greatly improve the loading capacity of active substances on a unit area, improve the specific capacity of the material, and meanwhile, the porous structure can accelerate the permeation of electrolyte, shorten an ion transmission channel and increase the active surface area of the active material in contact with the electrolyte, so that the specific capacity, the multiplying power and the cycle performance of the iron oxide are further improved.

(5) The detection shows that the iron oxide nanorod array material grown on the foam titanium substrate prepared by the invention is as follows: the aperture of the titanium foam is 20-25 μm, and the iron oxide nanorods are uniformly distributed on the surface layer and in the holes of the titanium foam.

The iron oxide nanorod array material grown on the foamed titanium substrate prepared by the invention is tested by electrochemical performance: the sweep rate of the prepared product is 1mV s^-1The specific capacity is 2.891-4.697F cm^-2(ii) a At a sweeping speed of 5mV s^-1The specific capacity is 1.127-2.022F cm^-2(ii) a At a sweeping speed of 50mV s^-1The specific capacity is 0.420-0.850F cm^-2。

Therefore, the invention has the characteristics of simple process, convenient operation, environmental protection and easy industrial production, and the prepared iron oxide nanorod array material grown on the foamed titanium substrate has high specific capacity, good rate capability and excellent cycling stability.

Drawings

FIG. 1 is an XRD pattern of iron oxide nanorod array material grown on a titanium foam substrate prepared according to the present invention;

FIG. 2 is a high magnification SEM image of the growth of iron oxide nanorod array material on the titanium foam substrate shown in FIG. 1;

FIG. 3 is a low-magnification SEM image of the iron oxide nanorod array material grown on the titanium foam substrate shown in FIG. 1;

FIG. 4 is a diagram of electrochemical performance of three electrodes of the iron oxide nanorod array material grown on the titanium foam substrate shown in FIG. 1;

FIG. 5 is a diagram of the electrochemical performance of three electrodes of an iron oxide nanorod array material grown on another titanium foam substrate prepared by the present invention;

FIG. 6 is a diagram of electrochemical performance of three electrodes of a further iron oxide nanorod array material grown on a titanium foam substrate according to the present invention;

FIG. 7 is a diagram of the electrochemical performance of three electrodes of an iron oxide nanorod array material grown on a titanium foam substrate prepared by the method of the present invention.

Detailed Description

The invention is further described with reference to the following drawings and detailed description, but the invention is not limited to the scope of the claims.

An iron oxide nanorod array material grown on a foamed titanium substrate and a preparation method thereof. The preparation method of the specific embodiment comprises the following steps:

(1) the materials are mixed according to the mass ratio of sodium sulfate, ferric chloride hexahydrate and deionized water of 7: 7800, and stirred at room temperature to obtain a mixed solution.

(2) And ultrasonically cleaning the titanium foam for 15-30 min by using a detergent, ultrasonically cleaning for 15-30 min by using ethanol and ultrasonically cleaning for 15-30 min by using deionized water in sequence, immersing the cleaned titanium foam into a reaction kettle containing the mixed solution, carrying out hydrothermal reaction for 4-7 h at 160-170 ℃, and naturally cooling to room temperature.

(3) Washing the naturally cooled titanium foam with deionized water for 2-3 times, and drying at 60-80 ℃ for 6-8 h to obtain a precursor.

(4) And (3) placing the precursor in a tubular atmosphere furnace, heating to 430-470 ℃ at the speed of 5-10 ℃/min under the protection of argon, preserving the temperature for 2-3 h, and naturally cooling to obtain the iron oxide nanorod array material growing on the foamed titanium substrate.

In this embodiment:

the detection shows that the iron oxide nanorod array material grown on the titanium foam substrate prepared by the specific embodiment is as follows: the aperture of the titanium foam is 20-25 μm, and the iron oxide nanorods are uniformly distributed on the surface layer and in the holes of the titanium foam.

Fig. 2 and 3 show an iron oxide nanorod array material grown on a titanium foam substrate prepared according to this embodiment, and fig. 2 and 3 show that iron oxide nanorods of the iron oxide nanorod array material grown on the titanium foam substrate are combined with titanium foam having a three-dimensional pore structure to form a three-dimensional structure in which titanium foam pores and nanorods are tightly arranged in a nested manner.

The sodium sulfate is analytically pure.

The ferric chloride hexahydrate is analytically pure.

The foamed titanium is in a strip shape, and the purity of the foamed titanium is more than 99.95%.

The detailed description is omitted in the embodiments.

Example 1

An iron oxide nanorod array material grown on a foamed titanium substrate and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:

(1) the materials are mixed according to the mass ratio of sodium sulfate, ferric chloride hexahydrate and deionized water of 7: 7800, and stirred at room temperature to obtain a mixed solution.

(2) And ultrasonically cleaning the titanium foam for 15min by using a detergent, ultrasonically cleaning for 25min by using ethanol and ultrasonically cleaning for 20min by using deionized water in sequence, immersing the cleaned titanium foam into a reaction kettle containing the mixed solution, carrying out hydrothermal reaction for 4h at 170 ℃, and naturally cooling to room temperature.

(3) And washing the naturally cooled foam titanium with deionized water for 2 times, and drying for 8 hours at the temperature of 60 ℃ to obtain a precursor.

(4) And (3) placing the precursor in a tubular atmosphere furnace, heating to 430 ℃ at the speed of 5 ℃/min under the protection of argon, preserving the temperature for 3h, and naturally cooling to obtain the iron oxide nanorod array material growing on the foamed titanium substrate.

The detection shows that the iron oxide nanorod array material grown on the foamed titanium substrate prepared by the experiment is as follows: the aperture of the titanium foam is 22 μm, and the iron oxide nano-rods are uniformly distributed on the surface layer and in the holes of the titanium foam.

The iron oxide nanorod array material grown on the titanium foam substrate prepared in the embodiment is shown in fig. 5 after being subjected to electrochemical performance tests: the sweep rate of the prepared product is 1mV s^-1Specific capacity at 2.891F cm^-2(ii) a At a sweeping speed of 5mV s^-1Specific capacity at time of 1.127F cm^-2(ii) a At a sweeping speed of 50mV s^-1Specific capacity at 0.452F cm^-2。

Example 2

An iron oxide nanorod array material grown on a foamed titanium substrate and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:

(1) the materials are mixed according to the mass ratio of sodium sulfate, ferric chloride hexahydrate and deionized water of 7: 7800, and stirred at room temperature to obtain a mixed solution.

(2) And ultrasonically cleaning the titanium foam for 20min by using a detergent, ultrasonically cleaning for 30min by using ethanol and ultrasonically cleaning for 25min by using deionized water in sequence, immersing the cleaned titanium foam into a reaction kettle containing the mixed solution, carrying out hydrothermal reaction for 5h at 165 ℃, and naturally cooling to room temperature.

(3) And washing the naturally cooled foam titanium by using deionized water for 3 times, and drying for 7 hours at the temperature of 70 ℃ to obtain a precursor.

(4) And (3) placing the precursor in a tubular atmosphere furnace, heating to 450 ℃ at the speed of 7 ℃/min under the protection of argon, preserving the temperature for 2.5h, and naturally cooling to obtain the iron oxide nanorod array material growing on the titanium foam substrate.

The detection shows that the iron oxide nanorod array material grown on the foamed titanium substrate prepared by the experiment is as follows: the aperture of the titanium foam is 25 μm, and the iron oxide nano-rods are uniformly distributed on the surface layer and in the holes of the titanium foam.

The iron oxide nanorod array material grown on the titanium foam substrate prepared in the embodiment is subjected to electrochemistryThe results of the tests are shown in FIG. 6: the sweep rate of the prepared product is 1mV s^-1Specific capacity at 3.620F cm^-2(ii) a At a sweeping speed of 5mV s^-1Specific capacity at time of 1.155F cm^-2(ii) a At a sweeping speed of 50mV s^-1Specific capacity at 0.420F cm^-2。

Example 3

An iron oxide nanorod array material grown on a foamed titanium substrate and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:

(1) the materials are mixed according to the mass ratio of sodium sulfate, ferric chloride hexahydrate and deionized water of 7: 7800, and stirred at room temperature to obtain a mixed solution.

(2) And ultrasonically cleaning the titanium foam for 25min by using a detergent, ultrasonically cleaning for 20min by using ethanol and ultrasonically cleaning for 15min by using deionized water in sequence, immersing the cleaned titanium foam into a reaction kettle containing the mixed solution, carrying out hydrothermal reaction for 6h at 165 ℃, and naturally cooling to room temperature.

(3) And washing the naturally cooled foam titanium by using deionized water for 3 times, and drying for 7 hours at the temperature of 80 ℃ to obtain a precursor.

(4) And (3) placing the precursor in a tubular atmosphere furnace, heating to 450 ℃ at the speed of 10 ℃/min under the protection of argon, preserving the temperature for 2h, and naturally cooling to obtain the iron oxide nanorod array material growing on the foamed titanium substrate.

The detection shows that the iron oxide nanorod array material grown on the foamed titanium substrate prepared by the experiment is as follows: the aperture of the titanium foam is 20 μm, and the iron oxide nanorods are uniformly distributed on the surface layer and in the holes of the titanium foam.

The iron oxide nanorod array material grown on the titanium foam substrate prepared in the embodiment is shown in fig. 4 after being subjected to electrochemical performance tests: the sweep rate of the prepared product is 1mV s^-1Specific capacity at 4.697F cm^-2(ii) a At a sweeping speed of 5mV s^-1Specific capacity at 2.022F cm^-2(ii) a At a sweeping speed of 50mV s^-1Specific capacity of 0.850F cm^-2。

Example 4

An iron oxide nanorod array material grown on a foamed titanium substrate and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:

(1) the materials are mixed according to the mass ratio of sodium sulfate, ferric chloride hexahydrate and deionized water of 7: 7800, and stirred at room temperature to obtain a mixed solution.

(2) And ultrasonically cleaning the titanium foam for 30min by using a detergent, ultrasonically cleaning for 15min by using ethanol and ultrasonically cleaning for 30min by using deionized water in sequence, immersing the cleaned titanium foam into a reaction kettle containing the mixed solution, carrying out hydrothermal reaction for 7h at 160 ℃, and naturally cooling to room temperature.

(3) And washing the naturally cooled foam titanium by using deionized water for 3 times, and drying for 6 hours at the temperature of 80 ℃ to obtain a precursor.

(4) And (3) placing the precursor in a tubular atmosphere furnace, heating to 470 ℃ at the speed of 10 ℃/min under the protection of argon, preserving the temperature for 2h, and naturally cooling to obtain the iron oxide nanorod array material growing on the foamed titanium substrate.

The detection shows that the iron oxide nanorod array material grown on the foamed titanium substrate prepared by the experiment is as follows: the aperture of the titanium foam is 23 μm, and the iron oxide nanorods are uniformly distributed on the surface layer and in the holes of the titanium foam.

The iron oxide nanorod array material grown on the titanium foam substrate prepared in the embodiment is shown in fig. 7 after being subjected to electrochemical performance tests: the sweep rate of the prepared product is 1mV s^-1Specific capacity at 4.211F cm^-2(ii) a At a sweeping speed of 5mV s^-1Specific capacity at time of 1.267F cm^-2(ii) a At a sweeping speed of 50mV s^-1Specific capacity at 0.421F cm^-2。

Compared with the prior art, the beneficial effects of the specific implementation mode are as follows:

(1) according to the specific embodiment, firstly, the foamed titanium is subjected to ultrasonic cleaning by using the detergent, the ethanol and the deionized water in sequence, then the precursor is obtained through hydrothermal reaction at the temperature of 160-170 ℃, then the precursor is subjected to argon heat treatment, and the iron oxide nanorod array material growing on the foamed titanium substrate is obtained, and the process is simple.

(2) The specific embodiment has no toxic gas release in the reaction process, and the Na discharged after the reaction is finished₂SO₄And FeCl₃·6H₂The O mixed waste liquid has little pollution to the environment and is green and environment-friendly. The iron source for preparing the ferric oxide has low price, the equipment required by the production process is simple, and the production cost is low.

(3) The iron oxide nanorods in the iron oxide nanorod array material grown on the titanium foam substrate prepared by the specific embodiment are closely arranged on the substrate. Firstly, the contact area of unit mass electrode/electrolyte can be increased by material nanocrystallization, so that more reaction sites are generated, secondly, the ordered nanorod array structure is most effective in the aspect of reaction kinetics, and the provided fast and direct electron transport channel can shorten the transport path of electrolyte ions and electrons, so that larger capacitance and higher rate performance are obtained.

(4) The iron oxide nanorods of the iron oxide nanorod array material grown on the titanium foam substrate prepared by the specific embodiment are combined with the titanium foam with a three-dimensional pore structure to form the three-dimensional material in which the iron oxide nanorod array and the titanium foam substrate are nested and grown. The three-dimensional porous structure can greatly improve the loading capacity of active substances on a unit area, improve the specific capacity of the material, and meanwhile, the porous structure can accelerate the permeation of electrolyte, shorten an ion transmission channel and increase the active surface area of the active material in contact with the electrolyte, so that the specific capacity, the multiplying power and the cycle performance of the iron oxide are further improved.

(5) The iron oxide nanorod array material grown on the titanium foam substrate prepared by the specific embodiment is shown in the attached drawings: FIG. 1 is an XRD pattern of iron oxide nanorod array material grown on a titanium foam substrate prepared in example 3; FIG. 2 is a high magnification SEM image of the growth of iron oxide nanorod array material on the titanium foam substrate shown in FIG. 1; FIG. 3 is a low-magnification SEM image of the iron oxide nanorod array material grown on the titanium foam substrate shown in FIG. 1. As can be seen from FIG. 1, the product is pure phase Fe₂O₃Material (PDF # 33-0664); as can be seen from FIGS. 2 and 3, the iron oxide nanorod arrays in the product are grown on the surface of the titanium foam sheet layer in a closely and orderly manner, not only on the surface of the sheet layer, but also in the pores of the titanium foam, and it can be seen that the three-dimensional pore structure greatly improves the unit areaThe loading capacity of the active material is greatly improved, so that the specific capacity of the material is greatly improved; fig. 4, fig. 5, fig. 6 and fig. 7 are diagrams of electrochemical performance of three electrodes for growing iron oxide nanorod array materials on the titanium foam substrate prepared in examples 3, 1, 2 and 4 in sequence; as can be seen from FIGS. 4, 5, 6 and 7, the four curves all have distinct redox peaks corresponding to Fe³⁺/Fe²⁺And the valence state is changed in the charging and discharging process. As the sweep rate is increased, the distance between the oxidation peak and the reduction peak is gradually increased, but the shape of the curve is basically maintained, which indicates that the electrode oxidation-reduction reaction process has higher coulombic efficiency and good reversibility.

(6) The detection shows that the iron oxide nanorod array material grown on the titanium foam substrate prepared by the specific embodiment is as follows: the aperture of the titanium foam is 20-25 μm, and the iron oxide nanorods are uniformly distributed on the surface layer and in the holes of the titanium foam.

The iron oxide nanorod array material grown on the titanium foam substrate prepared by the specific embodiment is tested by electrochemical performance: the sweep rate of the prepared product is 1mV s^-1The specific capacity is 2.891-4.697F cm^-2(ii) a At a sweeping speed of 5mV s^-1The specific capacity is 1.127-2.022F cm^-2(ii) a At a sweeping speed of 50mV s^-1The specific capacity is 0.420-0.850F cm^-2。

Therefore, the specific implementation mode has the characteristics of simple process, simple and convenient operation, environmental friendliness and capability of realizing industrial production, and the prepared iron oxide nanorod array material grown on the foamed titanium substrate has high specific capacity, good rate capability and excellent cycling stability.