Preparation and application of molybdenum-doped cobalt selenide foamed nickel composite electrode for electrolyzing water

Abstract

The invention discloses preparation and application of a molybdenum-doped cobalt selenide foamed nickel composite electrode for electrolyzing water. The composite electrode is formed by depositing a molybdenum-doped cobalt selenide compound on a foamed nickel electrode, and the composite electrode is marked as Mo-CoSe2NS-NF. The electrode is applied to water electrolysis and has good electro-catalytic performance and stability on hydrogen evolution and oxygen evolution at the same time, the catalytic hydrogen evolution [eta]10 is 89mV, and the Tafel slope is 69mV dec-1; the catalytic oxygen evolution [eta]10 is 234 mV, the Tafel slope is 58 mV dec-1, the Tafel serves as a cathode and an anode to form an electrolytic cell, and the electrolytic voltage is only 1.56 V when the current densityin an alkaline medium reaches 10 mA cm <-2>. The catalytic active substance of the composite electrode is directly deposited on the foamed nickel electrode, the synthesis method is simple, green andenvironment-friendly, and the composite electrode has an efficient bifunctional catalytic effect, so that the designed water electrolysis tank is simple in structure and suitable for industrial large-scale application of water electrolysis.

Description

technical field

[0001] The invention relates to an electrocatalytic composite electrode for water electrolysis, in particular to a preparation method and application of a molybdenum-doped cobalt selenide foamed nickel with high-efficiency electrocatalysis for electrolysis of hydrogen and oxygen evolution, and belongs to the field of electrolysis of water. Background technique

[0002] With the improvement of human living standards and the improvement of social civilization, the requirements for energy supply and ecological environment quality are constantly increasing. At present, how to solve the economic and technical challenges and problems related to energy and environment in a timely manner has become an important issue facing the whole human society, including the conversion and storage of clean and renewable energy including fuel cells, metal-air batteries and electrochemical water separation devices The system has thus been greatly stimulated and developed. Among th...

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