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Method for measuring electroactive area of three-dimensional porous membrane electrode

A three-dimensional porous and membrane electrode technology, which is applied in the fields of permeability/surface area analysis, suspension and porous material analysis, measurement devices, etc., can solve the problems of tedious BET method and the inability to accurately measure the electroactive area of ​​three-dimensional porous electrodes, and achieve operational Simple, fast and convenient, fast electrochemical reaction response, sensitive and accurate effects

Inactive Publication Date: 2011-05-04
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to propose an electrochemical method for measuring the electroactive area of ​​a three-dimensional porous membrane electrode and the thickness of the active film, which solves the problem that the existing gas adsorption BET method is cumbersome and cannot accurately measure the electroactive area of ​​a three-dimensional porous electrode in a liquid-solid electrochemical reaction system. Especially the problem of electroactive membrane area of ​​three-dimensional porous membrane electrode

Method used

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  • Method for measuring electroactive area of three-dimensional porous membrane electrode
  • Method for measuring electroactive area of three-dimensional porous membrane electrode
  • Method for measuring electroactive area of three-dimensional porous membrane electrode

Examples

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Embodiment 1

[0032] A three-dimensional porous nickel foam matrix with a length, width and thickness of 1 cm, 1 cm and 0.12 cm was used as the working electrode, and at 5 mmol L -1 K 3 Fe(CN) 6 solution (which contains 0.5mol·L -1 Na 2 SO 4 as a supporting electrolyte) to measure the cyclic voltammetry curves at different scan speeds. Scan speeds are 10, 20, 30, 40, 50, 70, 100 and 200mV·s -1 . The peak current increases with the increase of the scanning speed, and the square root of the peak current and the scanning speed shows a good linear relationship, according to the Randles-Sevick formula into [Fe(CN) 6 ] 3- The concentration c(5m mol·L -1 ) and its diffusion coefficient D(6.2×10 -6 cm 2 ·s -1 ), by the slope B of the line (101.032×10 -3 ) Calculate the electrochemical reaction active area A of the membrane electrode to be 30.168cm 2 .

[0033] Electrodeposition method was used to deposit NiHCF thin film on the nickel foam electrode, and the three-dimensional porous me...

Embodiment 2

[0035] 18 graphite cores with a diameter of 2mm were divided into three rows and assembled into a multi-row graphite core matrix as a working electrode. -1 K 3 Fe(CN) 6 solution (which contains 0.5mol·L -1 Na 2 SO 4 as a supporting electrolyte) to measure the cyclic voltammetry curves at different scan speeds. Scan speeds are 10, 20, 30, 40, 50, 70, 100 and 200mV·s -1 . The peak current increases with the increase of the scanning speed, and the square root of the peak current and the scanning speed shows a good linear relationship, according to the Randles-Sevick formula into [Fe(CN) 6 ] 3- The concentration c(5m mol·L -1 ) and its diffusion coefficient D(6.2×10 -6 cm 2 ·s -1 ), by the slope B of the line (57.421×10 -3 ) Calculate the electrochemical reaction area A of the electrode as 42.296cm 2 , and the theoretical surface area of ​​the graphite matrix is ​​50.87cm 2 very close.

[0036] Electrodeposition method was used to deposit NiHCF thin film on this mul...

Embodiment 3

[0039] Graphite particles with a particle size of 50-300 μm are added to an appropriate amount of polytetrafluoroethylene and ethanol, thoroughly stirred, and then coated layer by layer on a nickel mesh with a length × width of 1 cm × 1 cm. After drying, it is compressed into a three-dimensional porous conductive material. substrate; then the three-dimensional porous NiHCF membrane electrode is prepared by chemical deposition method. at 1mol L -1 KNO 3 The cyclic voltammetry curves at different scan speeds were measured in the solution. Scan speeds are 10, 20, 30, 40, 50, 70, 100 and 200mV·s -1 . The peak current increases with the increase of the scanning speed, and the square root of the peak current and the scanning speed shows a good linear relationship, and the electrochemical reaction active area A of the membrane electrode is calculated from the slope of the straight line ac 0.32cm 2 .

[0040] The porous graphite-based NiHCF membrane electrode was used as the wor...

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Abstract

The invention provides a method for measuring the electroactive area of a three-dimensional porous membrane electrode, which comprises the steps of: respectively measuring cyclic voltammetry curves under different scanning speeds in potassium cyanide-containing and potassium cyanide-free kali salt or sodium salt solution with a three-electrode system and a potentiostat by taking a three-dimensional porous electrode or the three-dimensional porous membrane electrode which is deposited with a transition element ferricyanide semiconductor membrane, and measuring the electroactive area and the cover degree thereof with the reversibility of the redox reaction of the membrane electrode in different solution systems; and obtaining the active volume and the average membrane depth of the inner membrane of the three-dimensional porous membrane electrode by combining with the chronocoulometry. The method is simple and reliable, and has strong practicability.

Description

technical field [0001] The invention belongs to a method for measuring the electroactive area of ​​a three-dimensional porous membrane electrode, specifically, an electrochemical method for measuring the electroactive area of ​​a three-dimensional porous membrane electrode and the thickness of an active film. Background technique [0002] The three-dimensional porous electrode can achieve high apparent current density and high macroscopic reaction rate by utilizing a large electrode active inner surface under relatively low electrode polarization. Due to a series of advantages such as large reaction surface area, good adsorption and mass transfer conditions, and long liquid-solid phase contact reaction time, three-dimensional porous electrodes are widely used in high-energy batteries, supercapacitors, fuel cells, electrodeposition, electrochemical synthesis, and electrocatalytic oxidation. This area of ​​technology has great application potential and its importance is increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01B7/06
Inventor 郝晓刚王忠德杨言言张忠林刘世斌
Owner TAIYUAN UNIV OF TECH
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