阅读说明：本技术 一种PtNPs/NiNPs/碳布可塑电极及其应用 (PtNPs/NiNPs/carbon cloth plastic electrode and application thereof ) 是由 孙晶 曹厚勇 方尧萱 于 2019-11-29 设计创作，主要内容包括：本发明涉及一种PtNPs/NiNPs/碳布可塑电极及其应用,属于燃料电池技术领域。主要技术方案为以碳布为基底和导电层,纳米镍铂颗粒为电化学沉积层,所述纳米铂颗粒沉积在纳米镍颗粒上,纳米镍颗粒沉积在碳布上。本发明利用碳布良好的导电性,制得一种对麦芽糖具有高灵敏度的电极,且该电极在麦芽糖为基液时,催化效果好、灵敏度高、选择性好、结构稳定等优点,本燃料电池可用于制作随身充电宝,可用于发电厂及电动汽车等领域。(The invention relates to a PtNPs/NiNPs/carbon cloth plastic electrode and application thereof, belonging to the technical field of fuel cells. The main technical scheme is that carbon cloth is used as a substrate and a conducting layer, nano nickel platinum particles are used as an electrochemical deposition layer, the nano platinum particles are deposited on the nano nickel particles, and the nano nickel particles are deposited on the carbon cloth. The electrode with high sensitivity to maltose is prepared by utilizing the good conductivity of the carbon cloth, and has the advantages of good catalytic effect, high sensitivity, good selectivity, stable structure and the like when the maltose is used as a base liquid.)

1. A PtNPs/NiNPs/carbon cloth plastic electrode is characterized in that carbon cloth is used as a substrate and a conducting layer, nano nickel platinum particles are used as an electrochemical deposition layer, the nano platinum particles are deposited on the nano nickel particles, and the nano nickel particles are deposited on the carbon cloth;

the PtNPs/NiNPs/carbon cloth plastic electrode is prepared by the following method:

(1) adopting a three-electrode system, using a phthalocyanine/polyacid carbon cloth electrode as a working electrode, an Ag/AgCl electrode and a platinum wire electrode as reference electrodes and a counter electrode to be placed in an electrolytic cell filled with a nickel sulfate solution, and preparing Ni/carbon cloth with a nano structure by adopting multi-potential step;

(2) immersing the nano-structured Ni/carbon cloth into 5mmol/L K₂PtCl₄And 0.05mol/LK₂SO₄In the mixture, a platinum electrode is used as a counter electrode, Ag/AgCl is used as a reference electrode, the voltage is set to be minus 0.4V, the time is 3200s, underpotential deposition is carried out, nitrogen protection is carried out after the deposition, and the PtNPs/NiNPs/carbon cloth plastic electrode is obtained after the mixture is placed for three days.

2. Use of the PtNPs/NiNPs/carbon cloth compliant electrode of claim 1 in the construction of a maltose fuel cell.

Technical Field

The invention relates to the field of fuel cells, in particular to a PtNPs/NiNPs/carbon cloth plastic electrode and application thereof.

Background

With the development of society, the demand for fossil fuels is rapidly increasing, and the exhaustion of fossil fuels and the serious pollution to the environment are accelerated, thereby limiting the development of human society and seriously affecting human health. To mitigate the environmental pollution and human health impact of fossil fuels, it is important to find alternatives to fossil fuels. The technical research and development and utilization of renewable energy resources are actively and widely carried out all over the world at present. At present, main substitutes of fossil fuels include biodiesel, liquid hydrogen, solar energy, wind energy and the like, and fuel cells are also substitutes of fossil fuels. The substitute is superior to other substitutes in the aspects of source distribution, transportation and the like, and the advantages of high cleanness, high conversion rate, low emission and the like of the fuel cell are applied to solving the energy problem.

Disclosure of Invention

The invention aims to develop a non-enzymatic fuel cell anode, which combines the advantages of nano materials to obtain a fuel cell anode with higher catalytic activity and stability. The invention uses carbon cloth as substrate, phthalocyanine (amino phthalocyanine: CoTAPc) and polyacid (P)₂Mo₁₈) Modifying the substrate with an autonomous device, and depositing nano platinum nickel particles on the autonomous device layer by an electrochemical deposition method to prepare the nano platinum nickel electrode. On the basis, a new method is provided for the construction of the maltose fuel cell.

In order to achieve the purpose, the invention adopts the technical scheme that: a PtNPs/NiNPs/carbon cloth plastic electrode takes carbon cloth as a substrate and a conducting layer, nano nickel platinum particles are an electrochemical deposition layer, the nano platinum particles are deposited on the nano nickel particles, and the nano nickel particles are deposited on the carbon cloth;

the PtNPs/NiNPs/carbon cloth plastic electrode is prepared by the following method:

(1) adopting a three-electrode system, using a phthalocyanine/polyacid carbon cloth electrode as a working electrode, an Ag/AgCl electrode and a platinum wire electrode as reference electrodes and a counter electrode to be placed in an electrolytic cell filled with a nickel sulfate solution, and preparing Ni/carbon cloth with a nano structure by adopting multi-potential step;

(2) immersing the nano-structured Ni/carbon cloth into 5mmol/L K₂PtCl₄And 0.05mol/LK₂SO₄In the mixture, a platinum electrode is used as a counter electrode, Ag/AgCl is used as a reference electrode, the voltage is set to be minus 0.4V, the time is 3200s, underpotential deposition is carried out, nitrogen protection is carried out after the deposition, and the PtNPs/NiNPs/carbon cloth plastic electrode is obtained after the mixture is placed for three days.

The invention also discloses the application of the PtNPs/NiNPs/carbon cloth plastic electrode in the construction of a maltose fuel cell.

A PtNPs/NiNPs/carbon cloth electrode is used as a working electrode, an Ag/AgCl electrode is used as a reference electrode, a platinum wire is used as an auxiliary electrode to form a three-electrode system, the three-electrode system is placed in maltose solution and supporting electrolyte, the set potential is-0.2-1.2V, a cyclic voltammetry curve of 10mmol/L maltose with the scanning speed range of 20-100 mV/S is recorded, and the control process of the electrode electrocatalytic oxidation maltose solution is analyzed by using a standard curve method.

Further, the supporting electrolyte contains 1mol/LKOH and has a pH of 14.

The invention has the following beneficial effects: the electrode with high sensitivity to maltose is prepared by utilizing the good conductivity of the carbon cloth, and has the advantages of good catalytic effect, high sensitivity, good selectivity, stable structure and the like when the maltose is used as a base liquid.

Drawings

FIG. 1 is a surface topography of a carbon cloth-based nano nickel/nano platinum composite electrode;

FIG. 2 is a comparison of cyclic voltammograms of maltose solution and a blank solution;

wherein: a. maltose solution, b, blank solution.

FIG. 3 is a plot of cyclic voltammograms of maltose solutions at different sweep rates.

Wherein: a. 100mV/s, b, 80mV/s, c, 60mV/s, d, 40mV/s, e, 20 mV/s.

FIG. 4 is a standard curve of maltose at different sweep rates.

FIG. 5 is a graph showing the resistance to poisoning of the PtNPs/NiNPs/carbon cloth electrode.

Detailed Description

The technical solutions of the present invention are further described below with reference to the drawings and the specific embodiments, but the present invention is not limited to the embodiments in any way. In the examples, unless otherwise specified, the experimental methods are all conventional methods; unless otherwise indicated, the experimental reagents and materials were commercially available.

The preparation method of the PtNPs/NiNPs/carbon cloth electrode in the following embodiment is as follows:

and taking a piece of carbon cloth to be used, and shearing the carbon cloth with the size of 10 x 20mm by using scissors for later use. And cleaning the carbon cloth with ethanol for 30 minutes, taking out, washing with deionized water, and drying with nitrogen for later use.

The carbon cloth substrate self-assembly comprises the following specific steps: the carbon cloth glass is placed in phthalocyanine (amino phthalocyanine: CoTAPc) to be soaked for 20min, and then taken out and dried. Placing CoTAPc/carbon cloth in polyacid (P)₂Mo₁₈) Soaking the solution for 20min, taking out, drying, and protecting with nitrogen gas for use.

The electrode preparation method comprises the following specific steps:

(1) using a three-electrode system with phthalocyanine (amino phthalocyanine: CoTAPc)/polyacid (P)₂Mo₁₈) The carbon cloth electrode is used as a working electrode, the Ag/AgCl electrode and the platinum wire electrode are used as reference electrodes and counter electrodes, and the reference electrodes and the counter electrodes are placed in an electrolytic cell filled with nickel sulfate (1M) solution. And (3) setting the electro-deposition parameter Step1 potential of the electrochemical workstation by adopting multi-potential Step: -0.1v, hold time 20s, Step2 potential: -0.2v, hold time 50s, Step3 potential: -0.3v, hold time 100s, Step4 potential: -0.4v, hold time 200s, Step5 potential: -0.5v, hold time 300s, Step6 potential: -0.6v, hold time 400s, Step7 potential: -0.7v, hold time 500s, Step8 potential: -0.8v, hold time 550s, Step9 potential: -0.9v, hold time 600s, Step10 potential: -1.0v, hold time 300s, Step11 potential: 1.1v, hold time 200s, Step12 potential: -1.2v, keeping time for 100s, and keeping the electrode under nitrogen protection after deposition for three days for later use.

Adopting a three-electrode system and soaking K in Ni/carbon cloth with a nano structure₂PtCl₄(5mmol/L) and K of 0.05mol/L₂SO₄In the mixture (2), a platinum electrode was used as a counter electrode and Ag/AgCl as a reference electrode. Setting the voltage to-0.4V and the time to 3200s, and carrying out underpotential deposition. And (5) carrying out nitrogen protection on the electrode after deposition, and standing for standby after three days.

The surface topography based on the carbon cloth/nano nickel platinum composite electrode is shown in figure 1: the nano-particle size and distribution on the electrode are uniform, and the electrocatalysis performance is particularly outstanding.

Example 1 comparison of cyclic voltammograms of maltose solution and blank solution

Firstly, placing a three-electrode system in a KOH solution with the pH of 14 and the concentration of 1mol/L, scanning within a potential range of-0.2-1.2V by using a cyclic voltammetry method, and recording a cyclic voltammetry curve of a blank solution; then, the three-electrode system is placed in 10mmol/L maltose solution to be detected containing 1mol/L KOH solution with pH of 14 as supporting electrolyte, and scanning is carried out in a potential range of-0.2-1.2V by using cyclic voltammetry, and the cyclic voltammetry curve of maltose is recorded. As shown in fig. 2: the catalytic effect of the Pt-Ni electrode at 10mmol/L maltose was tested at a scan rate of 100 mV/s. It can be seen from the figure that Pt-Ni electrodes are very active for maltose catalysis. Shows that the fuel composed of the Pt-Ni/carbon cloth electrode can efficiently convert the biological energy into the electric energy.

Example 2 Cyclic voltammetric response of PtNPs/NiNPs/carbon cloth electrode to maltose of the same concentration at different sweep rates

Sequentially placing the three-electrode system in a 10mm maltose solution to be detected containing 1mol/L KOH solution with the pH value of 14 as a supporting electrolyte, testing the maltose solutions with different sweep rates at the same concentration, wherein the sweep rates are respectively 20m V/s, 40m V/s, 60m V/s, 80mV/s and 100m V/s, and scanning within a potential range of-0.2-1.2V by using a cyclic voltammetry. Cyclic voltammograms of maltose at the same concentration and different sweep rates were recorded. As shown in the attached figures 3 and 4: as can be seen from the figure, as the sweep rate is increased continuously, the oxidation current of the nano electrode in the maltose solution is increased continuously, the oxidation peak is increased continuously, and a good linear response for catalyzing maltose is presented, so that the Pt-Ni electrode can be proved to be used for catalyzing maltose to be diffusion control.

EXAMPLE 3 determination of the antitoxic Capacity of the electrode

First, the three-electrode system was placed in a 1mol/L KOH solution having a pH of 14, and the time-current curve of ethanol was recorded at a potential of 0.7V by the time-current method. However, as shown in FIG. 5: after the 1000s anti-poisoning, the current still keeps 70% of the original current, so the anti-poisoning capability of the electrode is strong, and the structure is stable.

The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.