Difunctional porous alloy electrode and selective laser bombardment preparation method thereof

Abstract

The invention relates to a difunctional pore channel alloy electrode and a preparation method thereof, the electrode takes an alloy metal sheet with a pore channel structure as a conductive substrate, a pore channel is conical with a wide upper part and a narrow lower part, and alloy electrocatalyst particles are loaded on the inner wall of the pore channel in situ; the electrode has gas diffusion capability and electrocatalytic reduction activity of carbon dioxide at the same time, wherein in the difunctional porous alloy electrode, a laser bombardment selective area synthesis method is adopted, and after two metal sheets are stacked up and down, laser focuses are converged on the upper-layer metal sheet through a microscope equipped with a laser, and a selected point area is bombarded by laser for a period of time; at this time, the upper metal particles etch the lower metal sheet to form a pore channel structure, and alloy nanoparticles are loaded in the pore channel in situ, so that the dual-function pore channel alloy electrode is prepared in one step. The synthesis method belongs to a normal-temperature, normal-pressure, solid-phase and open-system preparation method, is convenient to operate, easy to control and environment-friendly, and does not use toxic reaction raw materials.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to an alloy electrode synthesized by selective laser bombardment with gas diffusion capability and electrocatalytic carbon dioxide reduction activity and a preparation method thereof. Background technique [0002] Gas diffusion electrodes are widely used in electrocatalysis, etc., and can be used to increase the current density to meet the requirements of industrial applications. The main components are gas diffusion layers and catalytic layers. Among them, the gas diffusion layer is usually made of porous material, which is used to transport gas and faces the gas chamber; the catalytic layer is composed of catalyst, which is used for catalytic reaction, and faces the liquid chamber. Under normal pressure, the gas and electrolyte are balanced in the catalyst layer, A stable gas-liquid-solid three-phase interface is formed, which improves the catalytic rate. In recent years...

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Problems solved by technology

[0003] The commonly used gas diffusion electrode is prepared by dropping the catalyst on the porous layer or using physical mixing and rolling. It usually consists of two parts: the gas diffusion layer and the electrocatalyst layer. It has several deficiencies: first, the gas diffusion layer And the electrocatalyst layer usually consists of two parts. It is necessary to choose a suitable method to combine the gas diffusion layer and the catalytic layer, which increases the complexity of the electrode preparation, and the long-term test is easy to cause the catalyst to fall off; secondly, the catalyst is generally loaded on the gas diffusion layer. On one side of the layer, it is difficult to realize the three-phase interface construction of gas-electrolyte-electrocatalyst inside the gas diffusion channel

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