阅读说明：本技术 一种具有颗粒状镍、铁、钴三元金属氢氧化物高性能析氧催化剂的制备方法 (Preparation method of high-performance oxygen evolution catalyst with granular nickel, iron and cobalt ternary metal hydroxide ) 是由 郭志岩 王友配 李明 王思清 杜芳林 于 2019-10-14 设计创作，主要内容包括：本发明涉一种具有颗粒状镍、铁、钴三元金属氢氧化物高性能析氧催化剂的制备方法,具体涉及一种利用水热法法一步合成,其具体制备工艺为：称取5.463g硝酸镍(H<Sub>12</Sub>N<Sub>2</Sub>NiO<Sub>12</Sub>)和2.517g硝酸铁(H<Sub>18</Sub>FeN<Sub>3</Sub>O<Sub>18</Sub>)以及0.604g硝酸钴(CoH<Sub>12</Sub>N<Sub>2</Sub>O<Sub>12</Sub>)溶于30mL去离子水中,将2.304g氢氧化钠(NaOH)和2.544g碳酸钠(Na<Sub>2</Sub>CO<Sub>3</Sub>)溶于30mL去离子水中,后将两种溶液混合剧烈搅拌后,在70－90℃温度范围内,水热条件下反应48h,将得到的沉淀离心,在60℃下干燥24h。所得到的具有具有颗粒状镍、铁、钴三元金属氢氧化物析氧催化剂具有析氧活性高,导电性好,碱性条件下稳定性高等优点。本发明材料制备方法简易,设备简单；原材料价格低廉,重复性好。(The invention relates to a preparation method of a high-performance oxygen evolution catalyst with granular nickel, iron and cobalt ternary metal hydroxide, in particular to a one-step synthesis method by a hydrothermal method, which comprises the following specific preparation processes: 5.463g of nickel nitrate (H) were weighed out 12 N 2 NiO 12 ) And 2.517g of iron nitrate (H) 18 FeN 3 O 18 ) And 0.604g of cobalt nitrate (CoH) 12 N 2 O 12 ) Dissolved in 30mL of deionized water, 2.304g of sodium hydroxide (NaOH) and 2.544g of sodium carbonate (Na) 2 CO 3 ) Dissolved in 30mLMixing the two solutions in deionized water, stirring vigorously, reacting at 70-90 deg.C under hydrothermal condition for 48 hr, centrifuging the obtained precipitate, and drying at 60 deg.C for 24 hr. The obtained oxygen evolution catalyst with the granular nickel, iron and cobalt ternary metal hydroxide has the advantages of high oxygen evolution activity, good conductivity, high stability under alkaline conditions and the like. The material of the invention has simple preparation method and simple equipment; the raw materials are low in price and good in repeatability.)

1. The invention relates to a preparation method of a high-performance oxygen evolution catalyst with granular nickel, iron and cobalt ternary metal hydroxide, in particular to a method for synthesizing the high-performance oxygen evolution catalyst with more exposed active sites by utilizing a one-step hydrothermal method, wherein the synthesis method comprises the following steps: 5.463g of nickel nitrate (H) were weighed out₁₂N₂NiO₁₂) And 2.517g of iron nitrate (H)₁₈FeN₃O₁₈) And 0.604g of cobalt nitrate (CoH)₁₂N₂O₁₂) Dissolved in 30mL of deionized water, 2.304g of sodium hydroxide (NaOH) and 2.544g of sodium carbonate (Na)₂CO₃) Dissolving in 30mL deionized water, mixing the two solutions, stirring vigorously, reacting at 70-90 deg.C under hydrothermal condition for 48h, centrifuging the obtained precipitate, and drying at 60 deg.C for 24 h.

2. The preparation method of claim 1, the obtained high-performance oxygen evolution catalyst with the granular nickel, iron and cobalt ternary metal hydroxide has more exposed active sites, and electrochemical tests show that: the current density reaches 10mA cm^-2when the voltage is over-potential is only 230mV, the Tafel slope is smaller and is 72.7mV dec^-1。

Technical Field

The invention relates to a preparation method of a high-performance oxygen evolution catalyst with granular nickel, iron and cobalt ternary metal hydroxide, in particular to a method for synthesizing the high-performance oxygen evolution catalyst with the granular nickel, iron and cobalt ternary metal hydroxide exposing more active sites by using a hydrothermal method.

Background

The high-efficiency catalyst with the characteristics of large specific surface area, more exposed active sites and the like is a material capable of reducing overpotential, and has important application in the aspects of fuel cells, solar cells, metal air cells, clean hydrogen fuel production and the like.

In recent years, non-noble metal based transition metal (Ni, Fe, Co,) compounds and alloys have become effective catalysts for water decomposition and are identified as catalytically active centers due to their excellent theoretical catalytic performance, environmental friendliness and abundant sources. Transition metal hydroxides have gained much research interest in the field of electrocatalysis due to their low cost and abundant sources, and in addition, have good stability in acid-base media. It is important to design and synthesize efficient catalysts that can expose more active sites.

As a typical electro-catalyst material, the metal elements of nickel, iron and cobalt are widely researched in the aspect of the field of electro-catalytic oxygen evolution due to low cost and rich sources. The nickel, iron and cobalt ternary metal hydroxide is prepared by a one-step hydrothermal method, and the electrocatalytic activity is obviously enhanced because the structural unit of the nickel, iron and cobalt ternary metal hydroxide is formed by fine particles and can provide more active sites. Therefore, the granular nickel, iron and cobalt ternary metal hydroxide electrocatalyst has great advantages in oxygen evolution reaction.

As for the particle stack nickel, iron and cobalt ternary metal hydroxide electrocatalyst, the three-element metal hydroxide electrocatalyst has richer active centers, and has obvious advantages in the aspect of designing the electrochemical oxygen evolution reaction. So far, no report is found on the preparation method of the high-performance oxygen evolution catalyst with the granular nickel, iron and cobalt ternary metal hydroxide synthesized by a hydrothermal method.

Disclosure of Invention

The invention relates to a preparation method of a high-performance oxygen evolution catalyst with granular nickel, iron and cobalt ternary metal hydroxide, in particular to a one-step synthesis method by utilizing a hydrothermal method, wherein the obtained nickel, iron and cobalt ternary metal hydroxide catalyst has the advantages of high oxygen evolution activity, good conductivity, high stability under an alkaline condition and the like, and is easy for batch production.

The invention firstly prepares the high-performance oxygen evolution catalyst with granular nickel, iron and cobalt ternary metal hydroxide by a one-step hydrothermal method, and the specific preparation process comprises the following steps:

5.463g of nickel nitrate (H) were weighed out₁₂N₂NiO₁₂) And 2.517g of iron nitrate (H)₁₈FeN₃O₁₈) And 0.604g of cobalt nitrate (CoH)₁₂N₂O₁₂) Dissolved in 30mL of deionized water, 2.304g of sodium hydroxide (NaOH) and 2.544g of sodium carbonate (Na)₂CO₃) Dissolving in 30mL deionized water, mixing the two solutions, stirring vigorously, reacting at 80 deg.C for 48h, centrifuging the obtained precipitate, and drying at 60 deg.C for 24 h.

The product of the invention has the advantages of simple and easily realized process, stable product quality, good process repeatability, easily controlled reaction parameters, safety, reliability, cheap and easily obtained raw materials, easy amplification, industrial production and the like; the prepared nickel-iron-cobalt ternary metal hydroxide electrocatalyst with a fine particle stacking structure has the advantages of high oxygen evolution activity, good conductivity, high stability under an alkaline condition and the like.

Drawings

FIG. 1 is a scanning electron Shovel (SEM) morphology photograph of the product shown in example 1;

Detailed Description