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A dual-function channel alloy electrode and its preparation method by laser selective bombardment

An alloy electrode and dual-function technology, applied in the field of electrocatalysis, can solve the problems of catalyst shedding, difficult gas-electrolyte-electrocatalyst three-phase interface construction, increasing the complexity of electrode preparation, etc., and achieve the effect of easy control and convenient operation

Active Publication Date: 2022-07-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A dual-function channel alloy electrode and its preparation method by laser selective bombardment
  • A dual-function channel alloy electrode and its preparation method by laser selective bombardment
  • A dual-function channel alloy electrode and its preparation method by laser selective bombardment

Examples

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Embodiment 1

[0039] like Figures 1 to 2 As shown, a copper sheet with a purity of 99.99% and a thickness of 0.01 mm is used as the upper metal sheet 2, and a tin sheet with a purity of 99.99% and a thickness of 0.05 mm is used as the conductive substrate 1; The vacuum stage was turned on, and then the copper sheet was bombarded with laser 3, treated with a laser speed of 200 mm / s and a laser power of 0.72 W for 2 s.

[0040] The obtained area is 0.5cm 2 The copper-tin alloy gas diffusion electrode has a tapered channel structure distributed on the electrode. The narrow opening at the lower part of the conical channel is the gas diffusion opening 6, and the wide opening at the upper part is the electrolyte diffusion opening 5; alloy nanoparticles 4 are supported in-situ on the sidewall of the channel, and the nanoparticles are copper-tin alloy nanoparticles, and the prepared copper-tin alloy is prepared. Gas diffusion electrodes such as image 3 shown. Depend on Figure 4 It can be se...

Embodiment 2

[0042] Compared with Example 1, the area of ​​the laser bombardment area was changed to 0.3 cm 2 , the obtained electrode morphology is as Image 6 shown.

Embodiment 3

[0044] With respect to Example 1, the material of the conductive substrate was changed, and a silver sheet with a thickness of 0.1 mm was used as the conductive substrate, respectively, and a laser power of 0.3 W was used to carry out laser bombardment for 4 min. The obtained electrode crystal structures were as follows: Figure 7 shown.

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Abstract

The invention relates to a dual-function channel alloy electrode and a preparation method thereof. The electrode uses an alloy metal sheet with a channel structure as a conductive base, the upper channel is wide and the lower one is narrow and conical, and the alloy electrocatalyst particles are in-situ supported on the inner wall of the channel. This electrode has both gas diffusion ability and electrocatalytic reduction of carbon dioxide activity; this dual-functional porous alloy electrode adopts the laser bombardment selective synthesis method. On the upper metal sheet, and use laser to bombard the selected point area for a period of time, the upper metal particles etch the lower metal sheet to form a channel structure, and at the same time, the alloy nanoparticles are loaded in-situ in the channel, and a dual-functional Porous alloy electrodes. The synthesis method adopted in the present invention belongs to the preparation method of normal temperature, normal pressure, solid phase, and open system, and is convenient to operate, easy to control, and environmentally friendly, and no toxic reaction raw materials are used.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to an alloy electrode synthesized by laser selective 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 current density to meet the requirements of industrial applications. Its main components are gas diffusion layer and catalytic layer. Among them, the gas diffusion layer is usually made of porous materials, which are used to transport gas and face the gas chamber; the catalytic layer is composed of catalysts, which are used for catalytic reactions and face the liquid chamber. Under normal pressure, the gas and electrolyte reach equilibrium in the catalyst layer. A stable gas-liquid-solid three-phase interface is formed, which improves the catalytic rate. In recent year...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/032C25B11/051C25B1/23C25B3/26
CPCC25B1/00Y02E60/50
Inventor 周伟家王艺洁李晓刘震陈玉客刘晓燕
Owner UNIV OF JINAN