Nano-high-entropy alloy electrocatalyst and preparation method thereof

Abstract

The invention relates to a nano-high-entropy alloy electrocatalyst and a preparation method thereof, and belongs to the technical field of new material preparation. The material is composed of a three-dimensional porous carbon substrate and FeCoNiCrCu high-entropy alloy nanoparticles loaded on the three-dimensional porous carbon substrate; the nanoparticles are an FeNi alloy structure monoclinic system, and the space group is Pm6; the molar ratio of Fe to Co to Ni to Cr to Cu is 1:1:1:1:1. The preparation method comprises the following steps: 1) dissolving a template agent-sodium chloride, a carbon source, and urea with deionized water, adding a doping source, magnetically stirring and freezing until totally solid, and then performing vacuum drying; 2) performing heat treatment and then cooling to room temperature to obtain powder; 3) washing, filtering and drying the powder to obtain the nano-high-entropy alloy electrocatalyst; 4) producing the nano-high-entropy alloy electrocatalyst into a working electrode and performing electrochemical performance test. The diameter of the nano-high-entropy alloy nanoparticles is 10 to 100 nm; according to a reaction of oxygen evolution through catalysis of the high-entropy alloy electrocatalyst, the initial potential is 1.50 to 1.63 V, the overpotential is 360 to 460 mV when the current density is 10 mA cm<-2>, and the Tafel slope is 70 to 120 mV dec<-1>.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, and relates to a nano high-entropy alloy electrocatalyst and a preparation method thereof. Background technique [0002] The reaction kinetics of anode oxygen evolution involving a four-electron reaction is quite slow, and it is the most energy-consuming step in the water splitting reaction, which is a huge obstacle to the development of energy storage and conversion fields such as electrolysis of water and fuel cells. At present, the noble metals used to catalyze the oxygen evolution reaction are expensive and easily corroded. Non-noble metals also have problems of stability and poor activity. How to make the oxygen evolution reaction catalyst acceptable under the condition of lower content of noble metal or even without noble metal? The catalytic activity and operating life of the catalyst have become a problem that needs to be solved urgently, and it is also a problem that sci...

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Problems solved by technology

At present, the noble metals used to catalyze the oxygen evolution reaction are expensive and easily corroded. Non-noble metals also have problems of stability and poor activity. How to make the oxygen evolution reaction catalyst acceptable under the condition of lower content of noble metal or even without noble metal? Catalytic activity and operating life have become a problem that needs to be solved urgently, and it is also a problem that scientific researchers generally pay attention to.

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