Electrodeposition method for preparing transition metal nano-catalyst and application thereof in electrocatalytic CO2 reduction

Abstract

The invention belongs to the technical field of electrocatalyst preparation, and relates to a method for preparing a transition metal nano-catalyst, in particular to an electrodeposition method for preparing the transition metal nano-catalyst. The electrodeposition method comprises the following steps: adding transition metal insoluble salt (namely a precursor), oxide, a stabilizer polyvinyl pyrrolidone (PVP) and ethanol into a K2SO4 or KHCO3 solution to form a metastable mixed electrodeposition solution, then immersing a pure copper sheet or a carbon material as a carrier in the mixed electrodeposition solution, and conducting electrodeposition in a constant-voltage mode, wherein the transition metal electrodeposition precursor is sold on the market or decomposed. According to the electrodeposition method, an electric field formed during electrodeposition is used for adsorbing the metal insoluble salt and oxide to form a metal nano-structure, and the metal nano-structure is suitable for transition metal elements such as Cu, Ag, Au, Zn, Sn and the like. The preparation method is simple, continuous electrodeposition can be achieved only by adding a new electrodeposition precursor, and the prepared catalyst is excellent in performance and has good application prospects in the aspects of electro-catalysis, photocatalytic CO2 reduction and oxygen reduction.

Description

technical field [0001] The invention belongs to the technical field of electrocatalyst preparation, relates to a method for transition metal nano-catalysts, in particular to an electrodeposition method for preparing transition metal nano-catalysts and its application in electrocatalytic CO 2 reduction. Background technique [0002] Electrodeposition technology is a material synthesis method that uses the reduction effect of the electrolytic reaction cathode to reduce the metal ions in the solution to form metal elements on the surface of the cathode. The current electrodeposition technology can be applied to transition metals such as Zn, Ag, Cu, Sn, Au, etc., through potential, additives (diethylene glycol, sodium citrate, ethylene glycol, etc.) and changes in the concentration of metal ions in the solution to Synthesize diverse nanostructures for application in various photocatalytic and electrocatalytic environments. [0003] Electroplating technology can change the appe...

AI Technical Summary

Problems solved by technology

[0005] Electrodeposition technology still has some key problems that need to be improved. For example, if the concentration of pure metal ions is too high, the deposition rate will be too fast and large metal particles will be formed; if the concentration of metal ions is too low, the deposition rate will be slow and the deposition layer will be dense; important Unfortunately, the electronic structure of the metal catalyst obtained by electrodeposition is relatively single, and it is difficult to form a catalyst with abundant electronic states, which hinders the further improvement of catalytic performance; moreover, due to the consumption of ions during the deposition process, it will not be possible to continuously form deposition materials. , the shape changes

These problems lead to reduced metals not being able to exhibit better performance in the field of catalysis

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