Etching method capable of increasing electrochemical active area of nickel foam electrode

Abstract

The invention relates to an etching method capable of increasing the electrochemical active area of a nickel foam electrode, belonging to the fields of surface treatment technology for materials and electrocatalysis. According to the invention, a chemical etching solution with hydrochloric acid and an oxidizing agent as main components is used for soaking and etching of the nickel foam electrode,and the nickel foam electrode with a large active area and high stability is prepared by controlling etching time and the concentration of the etching solution. The prepared nickel foam electrode canprovide more active sites for hydrogen evolution and oxygen evolution of electrolysed water and reduce energy consumption in electrolysis. The etching method is simple in process and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to an etching method for increasing the electrochemical active area of ​​a foamed nickel electrode, and belongs to the fields of material surface treatment technology and electrocatalysis. Background technique [0002] Hydrogen energy, due to its advantages of high energy density, high conversion efficiency, clean and pollution-free, has become a new generation of clean energy known to everyone. However, hydrogen is only an energy carrier, not an energy source. Therefore, the method of preparing hydrogen determines whether the energy stored in hydrogen is a clean energy. Due to industrial cost considerations, fossil fuel hydrogen production accounts for 96% of the world's total hydrogen production, natural gas accounts for 48%, oil accounts for 30%, and coal accounts for 18%. Only the remaining less than 4% is hydrogen production from electrolyzed water. However, only hydrogen production by electrolysis of water will not produce...

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Problems solved by technology

However, in the preparation process of Raney-Ni electrodes, high-purity Raney-Ni alloys are required as raw materials to ensure their high activity and stability, and some also require plasma equipment and high temperature and high pressure conditions, which increases the preparation cost

In addition, the Raney-Ni electrode also has problems such as weak anti-reverse current capability, and the catalytic components of the electrode are easy to dissolve under the condition of long-term power failure, resulting in a decrease in electrode activity.

In recent years, research on increasing the electrochemically active area of ​​electrodes has emerged in an endless stream, but the preparation methods are mostly cumbersome.

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