Ni-S active cathode for hydrogen evolution with gradient structure and method for preparing same

Abstract

This invention relates to the nickel-sulphur active hydrogen-separating cathode with grads structure and its making method, which is to deposit a thin layer of metal nickel on the base metal surface first, then control the current density change from high to low during deposition by current cascade-transition method in the solution containing nickel iron and sulphur compound, and then obtain nickel-sulphur alloy deposition layer on the ordinal iron cathode surface by electrochemical deposition, wherein the prepared electrochemical deposition layer has grads structure, that is the sulphur atom content increases gradually from base metal to deposition layer surface, but nickel atom content decreases. The advantage in this invention is that the active cathode has well hydrogen-separating active and active deposition layer and base metal have firm combining power, the capability is stable.

Description

Technical field: [0001] The invention relates to a novel electrode and a preparation method thereof, in particular to a nickel-sulfur active hydrogen evolution cathode with a gradient structure and a method for preparing the cathode by electrochemical deposition technology, belonging to the field of electrode materials. Background technique: [0002] Chlor-alkali industry, electrolytic hydrogen production, organic electrolysis and other electrolysis industries all consume huge amounts of electric energy. Under the circumstances that petroleum energy is increasingly depleted, new energy development is slow, and energy costs are rising, saving limited energy resources and reducing energy consumption in industrial production have become electrolysis. An urgent and important research topic for industry. The energy consumption of the electrolysis industry is determined by the cell voltage during the production process. With the promotion of dimensionally fixed anodes (DSA) since ...

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Problems solved by technology

When the above-mentioned cathode materials are used in the chlor-alkali industry, the problem encountered is not the catalytic activity but the long-term stability and economic practicability. For example, under long-term cathodic polarization, the active structure of Raney Ni is prone to sintering and recrystallization and the activity decreases. ; Raney nickel has a porous structure and low mechanical strength of the skeleton, and the active layer is easy to peel off under the influence of external force, resulting in a decrease in activity; due to the large internal stress of the coating, the oxide-coated cathode is easy to fall off and lose activity when it is operated for a long time or under impact; nickel Due to the instability of the structure of base metal alloys and nickel-non-metal alloys, structural changes (from amorphous to crystalline) or dissolution of another component may occur under long-term operation, thereby losing catalytic activity

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