Metal self-supporting electrode, preparation method and application

A self-supporting electrode, metal technology, applied in electrodes, electrode coatings, non-precious metal oxide coatings, etc., can solve the problems of low electrocatalyst activity, low product selectivity, high application cost, and achieve good electrocatalytic redox The effect of high reactivity, high product selectivity and simple preparation method

Pending Publication Date: 2022-04-26
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a metal self-supporting electrode, a preparation method and an application, which are used to solve the problem of electrocatalysts in the prior art in the process of electrocatalytic reduc

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  • Metal self-supporting electrode, preparation method and application

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preparation example Construction

[0043] The preparation method of the metal self-supporting electrode in the present invention is simple, and the preparation cost is low. The shape of the prepared metal self-supporting electrode is a hollow fiber tube, the thickness of the tube wall is between 100nm and 300 μm, and the inner surface and the outer surface of the tube are porous. , the pore size is between 10nm and 10μm, and the raw metal powder, metal oxide powder or alloy powder used in the metal self-supporting electrode presents a partially sintered and fused state; the metal self-supporting electrode prepared in the present invention has good Electrocatalytic redox reaction activity, high product selectivity, high reproducibility and good stability; using low-grade renewable energy as an energy source, metal self-supporting electrodes can achieve directional conversion of small energy molecules at room temperature, And it is easy to apply on an industrial scale, not only for electrocatalytic CO 2 , N 2 、H...

Embodiment 1

[0101] This embodiment provides a metal self-supporting electrode, and its preparation method specifically includes the following steps:

[0102] S1. Mix spherical copper powder with a particle size of 50nm, NMP and PEI in proportions of 40wt%, 48wt%, and 12wt%, respectively, and ball mill for 12h at a rotating speed of 300r / min to obtain a uniform slurry;

[0103] S2. Degas the slurry in a vacuum drying oven for 12 hours. Driven by a syringe pump, the slurry is sprayed out through the spinneret at 7mL / min, then enters the coagulation solution through the air layer, and casts to form a hollow fiber tubular software. Wherein, the core liquid of spinneret is ultrapure water, and the flow rate of core liquid is 15mL / min, and coagulation liquid is tap water, and the air distance between spinneret and coagulation liquid liquid level is 1cm;

[0104] S3. Rinse the hollow fiber tubular soft body continuously with flowing tap water to remove the organic solvent, straighten and fix the...

Embodiment 2

[0109] This embodiment provides a metal self-supporting electrode. The difference between its preparation method and Embodiment 1 is that the raw material in step S1 is spherical copper powder with a particle size of 100 nm, NMP and PEI according to 43wt%, 46wt%, and 11wt%, respectively. The ratio is mixed; other steps and methods are the same as in Example 1, and will not be repeated here, and finally a copper self-supporting electrode with a porous hollow fiber tubular structure is prepared.

[0110]This embodiment also provides an application of a copper self-supporting electrode, which uses a constant potential method to reduce CO 2 , the applied voltage is -0.9Vvs.RHE, the reaction time is 1h, and the electrolyte is 0.5M KHCO 3 aqueous solution to obtain hydrogen, carbon monoxide and formic acid products, wherein the faradaic current efficiency of formic acid reaches 84.6%, which has good selectivity.

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Abstract

The invention provides a metal self-supporting electrode, a preparation method and application, and the preparation method comprises the following steps: S1, grinding and mixing metal or metal oxide powder, an organic solvent and a binder to obtain a slurry; s2, the slurry liquid is sprayed out through a spinning nozzle and enters solidification liquid through an air layer, and a hollow fiber tubular soft body is cast; s3, washing and shaping to obtain a green body; s4, roasting the green body in an oxidizing gas atmosphere to obtain an intermediate product; and S5, heating and reducing the intermediate product in a reducing gas atmosphere, and cooling to obtain the metal self-supporting electrode. The metal self-supporting electrode prepared by the preparation method is applied to electrocatalytic oxidation and reduction of CO2, N2, H2O, CH4, ethylene, propylene and glycerol. The preparation method is simple, convenient and low in cost, and the prepared metal self-supporting electrode has good electrocatalytic oxidation-reduction reaction activity, high product selectivity, high reproducibility and good stability.

Description

technical field [0001] The invention belongs to the field of electrocatalytic materials, and in particular relates to a metal self-supporting electrode, a preparation method and an application. Background technique [0002] Since the industrial revolution, especially in recent decades, modern society has developed rapidly and has a huge demand for energy, which has consumed a large amount of fossil energy and produced a large amount of CO 2 into the atmosphere. Plants in nature cannot absorb such an excess of CO 2 , resulting in atmospheric CO 2 The concentration continues to rise, which causes a series of global climate and environmental problems such as the greenhouse effect, which seriously threatens the sustainable development of human beings. CO 2 Emission reduction and resource utilization are the rational disposal of CO 2 important way to convert CO 2 As an economical, safe and sustainable C1 resource, CO 2 The process of emission reduction has received more an...

Claims

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Application Information

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IPC IPC(8): C25B11/031C25B11/046B22F3/11B22F5/00C25B1/01C25B1/04C25B1/23C25B3/26
CPCC25B11/031C25B11/046C25B1/04C25B1/23C25B1/01C25B3/26B22F3/11B22F5/00
Inventor 陈为朱畅陈奥辉李守杰冯光辉吴钢锋韦懿恒董笑宋艳芳李桂花魏伟孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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