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A method for controlling gas behavior on electrode surface for electrochemical reaction

A technology of electrode surface and gas, applied in the field of electrochemical efficiency control, can solve the problems of high price, complicated process, unsuitable for large-scale preparation, etc., and achieve the effect of low cost, easy to obtain raw materials, and rapid release

Active Publication Date: 2019-10-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of regulating the gas behavior on the electrode surface by changing the electrode structure and controlling the surface chemical composition is relatively complicated and expensive, and it is not suitable for large-scale preparation.

Method used

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  • A method for controlling gas behavior on electrode surface for electrochemical reaction
  • A method for controlling gas behavior on electrode surface for electrochemical reaction
  • A method for controlling gas behavior on electrode surface for electrochemical reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The surfactant proposed in this embodiment is used to regulate the behavior of electrode surface gas in acidic solution, including the following steps;

[0041] (1) The electrolyte solution is: 500mL of 0.1M / L nitric acid.

[0042] (2) Clean the inert Pt sheet electrode (1.6*0.8*0.2cm) with acetone, ethanol, and deionized water in sequence, and then place it in the electrolyte solution configured in (1).

[0043] (3) Apply a certain voltage at both ends of the inert Pt sheet electrode, and use a high-speed camera to observe the behavior of the gas on the electrode surface ( figure 2 shown). Surfactants were added to make their volume fractions 0.1%, 0.2%, 0.3% and 0.5%, and the behavior of the gas on the electrode surface was observed ( image 3 a-d).

Embodiment 2

[0045] The surfactant proposed in this embodiment is used to regulate the behavior of the electrode surface gas in a neutral solution, including the following steps;

[0046] (1) Configure the electrolyte as follows: 500mL of 0.1M / L sodium nitrate.

[0047] (2) Clean the inert Pt sheet electrode (1.6*0.8*0.2cm) with acetone, ethanol, and deionized water in sequence, and then place it in the electrolyte solution configured in (1).

[0048] (3) Apply a certain voltage at both ends of the inert Pt sheet electrode, and use a high-speed camera to observe the behavior of the gas on the electrode surface (such as Figure 4 shown). Surfactants were added to make their volume fractions 0.1%, 0.2%, 0.3% and 0.5%, and the behavior of the gas on the electrode surface was observed (such as Figure 5 a-d).

Embodiment 3

[0050] The surfactant proposed in this embodiment is used to regulate the behavior of the electrode surface gas in the alkaline solution, including the following steps;

[0051] (1) Configure the electrolyte as follows: 500mL of 0.1M / L sodium hydroxide.

[0052] (2) Clean the inert Pt sheet electrode (1.6*0.8*0.2cm) with acetone, ethanol, and deionized water in sequence, and then place it in the electrolyte solution configured in (1).

[0053] (3) Apply a certain voltage at both ends of the inert Pt sheet electrode, and use a high-speed camera to observe the behavior of the gas on the electrode surface (such as Figure 6 shown). Surfactants were added to make their volume fractions 0.1%, 0.2%, 0.3% and 0.5%, and the behavior of the gas on the electrode surface was observed (such as Figure 7 a-d).

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Abstract

The invention provides surfactant used for regulating the behaviors of gas on an electrode surface, and belongs to the technical field of electrochemical efficiency regulation. One or more surfactants is / are added to regulate the behaviors and the state of the gas on the electrode surface in order to effectively reduce and even eliminate the adhesion of gas on the electrode surface and improve the adhesion behavior of the gas on the electrode surface. The disadvantages of complex preparation process, high price and unsuitableness for large-scale use of methods for regulating the behaviors of the electrode surface through changing the electrode structure and controlling the chemical composition of the electrode surface are overcome, and a new idea is provided for the control of the behaviors of the gas on the electrode surface.

Description

technical field [0001] The invention belongs to the technical field of electrochemical efficiency control, and specifically relates to adding one or more surfactants to change (reduce or even eliminate or improve) the adhesion of gas on the electrode surface, realize the effective regulation of the bubble behavior on the electrode surface, and improve the efficiency of electrolysis and electrocatalysis . Background technique [0002] The electrochemical reactions that gas participates in mainly include: gas "overflow" and "absorption" reactions, both of which are key factors affecting the efficiency of electrocatalysis and the performance of corresponding devices. For the gas overflow electrocatalytic reaction, if the generated bubbles cannot leave the electrode surface in time, they will accumulate into a gas film and cover the surface, reducing the effective catalytic area, increasing the diffusion resistance and polarization effect of the electrolyte, and eventually leadi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
Inventor 王景明薛秀粘王瑞晓江雷
Owner BEIHANG UNIV