Nanosheet-structured NiFeCr composite hydroxide oxygen evolution material prepared by chemical oxidation method

Abstract

The invention provides a preparation method of an electro-catalytic moisture desorption oxygen desorption catalyst in a carbonate system, and belongs to the field of chemical oxidation and electro-catalytic moisture desorption oxygen desorption. Comprising the steps that a stainless steel material containing a nickel source, an iron source and a chromium source serves as a substrate, oil stains and oxides on the surface of the stainless steel material are removed, then the stainless steel material reacts in an alkaline solution containing a persulfate oxidizing agent at the temperature of 20-110 DEG C for 0.25-3 h, a product is taken out, washed to be clean and then subjected to vacuum drying, and the NiFeCr composite hydroxide oxygen evolution material with the nanosheet structure is obtained. The electrode can greatly reduce the oxygen evolution overpotential for catalyzing water decomposition in a carbonate system, a test result shows that the electrode treated by adopting a potassium persulfate oxidizing agent has excellent oxygen evolution catalytic performance, and the oxygen evolution overpotential is 263 mV and 384 mV respectively when the current density is 10 mA cm <-2 > and 100 mA cm <-2 > in 0.5 mol L <-1 > Na2CO3 / NaHCO3. The stainless steel substrate used in the method is cheap and easy to obtain, the treatment method is simple and easy to operate, conditions are mild, and the method is suitable for large-scale production.

Description

technical field [0001] The invention prepares an anode material with excellent electrocatalytic performance through simple and rapid chemical oxidation treatment, which is used for electrocatalytic water splitting in a carbonate system. Background technique [0002] The depletion of traditional fossil fuels and the pollution to the environment make people need to find a sustainable energy source such as hydrogen to replace traditional fossil fuels. Among all the current hydrogen production processes, the method of electrocatalytic water splitting for hydrogen production is favored by researchers because of its high efficiency and no pollution. Compared with traditional electrolytes, the electrolytic carbonate system can generate not only hydrogen and oxygen, but also sodium hydroxide and bicarbonate products, which are used in industry, but because the oxygen evolution reaction involves a four-electron transfer process. , the oxygen evolution kinetics in the carbonate syste...

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Problems solved by technology

At present, most of them use hydrothermal method, electrochemical treatment method, potassium permanganate / chlorine gas and sodium hypochlorite oxidation method to modify the surface, but because the hydrothermal method requires a long time and high temperature and high pressure process, the limitation of electrolytic devices such as electrolyzers The electrochemical treatment method cannot be used on a large scale and on a large scale, so we add a persulfate oxidant under alkaline conditions to carry out surface oxidation treatment under mild conditions. It is worth noting that, compared with the traditional chemical oxidation method Compared with persulfate oxidants, they are more environmentally friendly than chlorine-containing oxidants, and have stronger oxidizing ability in alkaline solution, so it is easy to form NiFeCr hydroxide with high oxygen evolution catalytic activity

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