Metal substrate/cobalt-containing hydrotalcite nano-membrane electrode and preparation method thereof

Abstract

The invention provides a metal substrate / cobalt-containing hydrotalcite nano-film electrode and a preparation method thereof. The electrode is obtained by growing a cobalt-containing hydrotalcite nano-film on a metal substrate, and can be directly used as an electrode. The preparation method is as follows: adding H2O2 into mixed salt liquor containing transition metal and cobalt to prepare electrolyte; adding an electrolyte into an electrolytic tank; on the basis of taking the metal substrate as a working electrode, carrying out electro-deposition at a room temperature, combining metal ions in liquor with hydroxyl radical, directly growing on the surface of the metal substrate, partly oxidizing divalent cobalt ion into trivalent cobalt ion by H2O2 to obtain a cobalt-containing hydrotalcite nano-film. Compared with the conventional powder synthetic method, the preparation method disclosed by the invention is simple to operate and gentle in reaction condition, and has non-toxic reaction agent; the nano-film is directly grown on the metal substrate without using a binder or carrying out post-treatment. The substrate can be a flexible metal substrate in various dimensions, and is suitable for large-scale production and engineering application of the cobalt-containing hydrotalcite nano-film. The cobalt-containing hydrotalcite nano-film electrode can be directly used for electrochemical water oxidation catalytic reaction, and has high catalytic activity on water oxidization reaction and good stability.

Description

technical field [0001] The invention belongs to the field of catalyst (electrode) preparation, and in particular relates to a cobalt-containing hydrotalcite nano-film electrode directly grown on a metal substrate and a preparation method thereof. The electrode can be directly used in an electrochemical water oxidation catalytic reaction. Background technique [0002] With the rapid increase of human demand for energy and the high environmental pollution caused by the consumption of traditional fossil energy, the development and utilization of renewable and clean energy has become an important way to solve the problem of traditional energy. Directly obtaining hydrogen and oxygen from water splitting is one of the most valuable ways to obtain clean energy. This method is pollution-free, the cost of raw materials is extremely low, and the obtained product (hydrogen) has a high energy storage density. The water decomposition methods usually include electrolysis and photolysis. A...

AI Technical Summary

Problems solved by technology

When performing catalytic evaluation, it is necessary to use binders such as naphthol to coat the glassy carbon electrode, resulting in problems such as powder samples not being well dispersed on the electrode surface, and active sites not fully in contact with the electrolyte, which greatly affects the catalytic effect

[0009] Literature [JakubA.Koza, ZhenHe, AndrewS.Miller, and JayA.Switzer. ElectrodepositionofCrystallineCo 3 o 4 —ACatalystfortheOxygenEvolutionReaction.Chem.Mater.2012,24,3567-3573.] uses electrodeposition to deposit cobalt-containing catalysts on metal substrates, but heating is required during deposition, and the operation is complicated and cumbersome

[0010] Therefore, the main problems of traditional cobalt-containing catalysts are: the catalysts are all powders, which are easy to aggregate, which will reduce the active exposure area during the catalytic reaction, resulting in a decrease in activity; the binding force between the catalyst powder and the electrode matrix is ​​not strong, and it is easy to fall off, and this also Increases the complexity of the electrode preparation process

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