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

Abstract

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. In the method, platinum metal salt, M metal salt, and nitrogen-containing ligand are dispersed in a solvent, and a homogeneous solution is obtained by ultrasonication; the homogeneous solution is placed in a water bath and stirred at 20-90°C; carbon carriers dispersed in the solvent are added, After ultrasonication, stir and evaporate the solvent at 20-120°C to obtain a black mixture; after drying and grinding, carbonize in an inert atmosphere at 200-1100°C for 0.1-3 hours; replace the inert gas with a reducing gas, etch and adhere The precipitate on the surface of the metal particles is obtained. The preparation method of the present invention does not need to use a surfactant, and the prepared nitrogen-doped carbon-supported low-platinum metal spherical nanoparticle electrocatalyst with uniform particle size has high electrocatalytic activity, and is suitable for anode hydrogen in hydroxide exchange membrane fuel cells oxidation reaction.

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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