Preparation method of nitrogen-doped carbon-supported low-platinum metal spherical nanoparticle electrocatalyst with uniform particle size and application

Abstract

The invention belongs to the technical field of metal electrocatalysts, and relates to a preparation method of a low-platinum metal spherical nanoparticle electrocatalyst with uniform nitrogen-doped carbon supported particle size and an application. The method comprises the following steps: dispersing platinum metal salt, M metal salt and a nitrogen-containing ligand into a solvent, and performingultrasonic treatment to obtain a uniform solution; putting the uniform solution into a water bath, and performing stirring at 20-90 DEG C; adding a carbon carrier dispersed in the solvent, carrying out ultrasonic treatment, performing stirring at 20-120 DEG C, and evaporating the solvent to dryness to obtain a black mixture; after drying and grinding, performing carbonizing for 0.1-3 hours at thetemperature of 200-1100 DEG C in an inert atmosphere; changing inert gas into reducing gas, and etching precipitates attached to the surfaces of the metal particles. According to the preparation method disclosed by the invention, a surfactant does not need to be used, and the prepared nitrogen-doped carbon-supported low-platinum metal spherical nanoparticle electrocatalyst with uniform particle size has higher electrocatalytic activity and is suitable for an anodic hydrogen oxidation reaction of a hydroxyl exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the technical field of metal electrocatalysts, and relates to a preparation method and application of a low-platinum metal spherical nanoparticle electrocatalyst with uniform nitrogen-doped carbon loading particle size. Background technique [0002] for H 2 -O 2 type hydroxide exchange membrane fuel cell, the cathode carries out the oxygen reduction reaction (1 / 2O 2 +H 2 O+2e - →2OH - ), the resulting OH - Passed through the hydroxide exchange membrane to the anode side. On the anode side fuel H 2 Complete the hydrogen oxidation reaction (H 2 +2OH - →2H 2 O+2e - ), making the fuel H 2 Convert chemical energy into electrical energy. In recent years, with the development of high-performance hydroxide exchange membranes and cathode ORR electrocatalysts, hydroxide exchange membrane fuel cells are expected to replace proton exchange membrane fuel cells and become the next generation of high-efficiency and low-cost energ...

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Problems solved by technology

However, more toxic chemical reagents are used in the synthesis of low-order phenolic resin, which is harmful to the environment (patent application number: 201910361025.7)

Zhang Chengwei et al. used discarded cigarette butt filters as carbon and nitrogen sources to generate nitrogen-doped porous carbon materials in one step; then impregnated platinum salts and nickel salts, and gas-phase reduction to obtain high-performance nitrogen-doped porous carbon-supported PtNi alloy particles methanol fuel cell catalysts , but the synthesis steps of nitrogen-doped porous carbon are complicated, which is not conducive to large-scale production (patent application number: 201811001681.8)

[0005] In summary, the synthesis methods of alkaline hydroxide electrocatalysts in reported articles or nitrogen-doped carbon-supported nano-metal catalysts in reported patents often require the use of environmentally unfriendly surfactants or chemical reagents; the synthesis steps are complex Or the utilization rate of noble metal spherical nanoparticles is not high

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