High-efficiency ptru/c bifunctional fuel cell anode catalyst and preparation method thereof

Abstract

The invention belongs to the field of fuel cell anode catalysts, in particular to a high-efficiency PtRu / C dual-function fuel cell anode catalyst and a preparation method thereof. Mix the Pt source and Ru source in ethylene glycol, stir well; then add sodium nitrate solution, then pass through hydrogen gas, react, after the reaction is completed, cool, wash, and dry to obtain PtRu nano-clusters; then mix with carbon black Uniform ultrasonication, and then heat treatment, to obtain the catalyst, the chemical formula is: Pt x Ru y -H 2 / C, where 0<x<4, 0<y<4, and x+y=4. The catalyst of the present invention has excellent methanol oxidation reaction and hydrogen oxidation reaction performance, has a relatively high Pt-Ru interface number, and has excellent electrocatalytic methanol performance, has excellent specific activity and mass activity of methanol and hydrogen oxidation reaction, and It has better stability; the invention also provides its preparation method.

Description

technical field [0001] The invention belongs to the field of fuel cell anode catalysts, in particular to a high-efficiency PtRu / C dual-function fuel cell anode catalyst and a preparation method thereof. Background technique [0002] Fuel cells have been extensively studied due to their ability to convert chemical energy into electrical energy without pollution. Proton exchange membrane fuel cells have demonstrated their excellent performance and efficacy. Hydrogen fuel cell (HFC) and direct methanol fuel cell (DMFC) are electrochemical power generation devices that do not need to go through the Carnot cycle. They have high energy conversion efficiency, no pollution, zero emissions, low operating noise, and high reliability. High, simple structure, easy maintenance and maintenance, among them, hydrogen and methanol have the advantages of wide source and operating temperature. For DMFC, it is especially suitable for mobile phones, portable notebook computers and some military...

AI Technical Summary

Problems solved by technology

So far, Pt-based catalysts are still the best catalysts for electrocatalytic methanol oxidation at the anode of fuel cells. However, Pt is expensive and prone to CO poisoning, which leads to a rapid decrease in its activity, which directly makes it difficult to realize industrial applications.

Therefore, Pt and transition metals (such as: Ru, Pd, Au and Ni, etc.) form bimetallic or trimetallic catalysts to improve the activity and stability of its electrocatalytic methanol oxidation through coordination; so far, PtRu is the most recognized It is the most effective catalyst for methanol oxidation and hydrogen oxidation. The addition of Ru can not only regulate the electronic structure of Pt, but also effectively remove the CO adsorbed on the surface of Pt. However, the activity and stability of PtRu catalysts still have room for improvement. space

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