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Composite electrode for electrodialysis as well as preparation method and application thereof

A composite electrode and application technology, applied in the field of electrodialysis, can solve the problems of cumbersome operation process, no industrial production application, high oxygen evolution overpotential, and achieve good electrochemical stability, good chemical stability, and good electrocatalytic performance. Effect

Inactive Publication Date: 2016-06-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxygen evolution overpotential of the two graphene-added electrodes prepared by this method is still relatively high.
Moreover, the operation process of this method is cumbersome and does not apply to industrial production (Ning Huili, Du Ailing, Xu Likun, Research on performance improvement of titanium-based metal oxide anodes containing graphene, Shandong University, 2015)

Method used

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  • Composite electrode for electrodialysis as well as preparation method and application thereof
  • Composite electrode for electrodialysis as well as preparation method and application thereof
  • Composite electrode for electrodialysis as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] (1) Preparation of conductive substrate / graphene electrode

[0080] Use 3M adhesive tape to fix the exposed area of ​​the titanium plate (1.4cm×1.5cm) to 0.7cm 2 , drop 50μl (1mgml -1 ) graphene oxide (GO) solution, placed in the air to dry naturally, to prepare a conductive substrate / graphene oxide Ti / GO electrode, and further prepare a conductive substrate / graphene electrode by electrochemical reduction, named Ti / rGO electrode.

[0081] (2)': Preprocessing

[0082] Before electrodeposition, apply 60% PTFE solution to the place where there is no rGO on the Ti / rGO electrode (that is, the working area of ​​the fixed electrode is 0.7cm 2 ), and placed in the air to dry naturally to form a film for later use.

[0083] (2) Preparation of conductive substrate / graphene / metal oxide composite electrodes by electrodeposition

[0084] Add 5mM RuCl to the electrolyte (composed of 0.01M HCl and 0.1M KCl) 3 ·xH 2 O solution with 0.5 mM IrCl 3 ·xH 2 O solution, with the Ti / rG...

Embodiment 2

[0090] (1) Preparation of conductive substrate / graphene electrode

[0091] The preparation method and conditions are the same as in Example 1, and a conductive substrate / graphene electrode is prepared, named Ti / rGO electrode;

[0092] (2)': Preprocessing

[0093] The method and condition of pretreatment are identical with embodiment 1;

[0094] (2) Preparation of conductive substrate / graphene / metal oxide composite electrodes by electrodeposition

[0095] To the electrolyte (the composition is 0.01MH 2 SO 4 and 0.2MKCl) by adding 5mM RuCl 3 ·xH 2 O solution with 0.5 mM IrCl 3 ·xH 2 O solution, with the Ti / rGO electrode that step (1) obtains as working electrode, adopts the method for electro-deposition to deposit metal oxide on the surface of Ti / rGO electrode, described metal oxide is ruthenium, iridium oxide, named after ( Ru+Ir)O x mH 2 O, that is, cyclic voltammetry was used to continuously scan 150 cycles between the potential of -0.3 and +1.0Vvs.SCE, and the elec...

Embodiment 3

[0099] (1) Preparation of conductive substrate / graphene electrode

[0100] The preparation method and conditions are the same as in Example 1, and a conductive substrate / graphene electrode is prepared, named Ti / rGO electrode;

[0101] (2)': Preprocessing

[0102] The method and condition of pretreatment are identical with embodiment 1;

[0103] (2) Preparation of conductive substrate / graphene / metal oxide composite electrodes by electrodeposition

[0104] Add 5mM RuCl to the electrolyte (composed of 0.1M HCl and 0.5M KCl) 3 ·xH 2 O solution with 1 mM IrCl 3 ·xH 2 O solution, with the Ti / rGO electrode that step (1) obtains as working electrode, adopts the method for electro-deposition to deposit metal oxide on the surface of Ti / rGO electrode, described metal oxide is ruthenium, iridium oxide, named after ( Ru+Ir)O x mH 2 O, that is, cyclic voltammetry was used to continuously scan 150 cycles between the potential of -0.3 and +1.0Vvs.SCE, and the electrolyte was placed in...

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Abstract

The invention provides a composite electrode for electrodialysis, which has low hydrogen evolution over-potential and low oxygen evolution over-potential, as well as a preparation method and an application thereof. A metal oxide material is deposited and prepared on the surface of a conductive base / graphene electrode through an electrolytic deposition method, so that a conductive base / graphene electrode / metal oxide composite electrode is obtained. The method provided by the invention is simple and easy to operate and low in preparation cost; the prepared composite electrode has good chemical stability and electrochemical stability, and also has good electrocatalytic properties and conductivity and a long service life. The composite electrode provided by the invention has the very low hydrogen evolution over-potential and oxygen evolution over-potential and can be used for carrying out a linear circulating volt-ampere test in a 0.5M H2SO4 solution; and under the condition of 10mAcm<-2>, the hydrogen evolution over-potential can be as low as 100mV and the oxygen evolution over-potential can be as low as 260mV.

Description

technical field [0001] The invention belongs to the technical field of electrodialysis, and relates to a composite electrode for electrodialysis, its preparation method and application, in particular to a composite electrode for electrodialysis with low hydrogen evolution overpotential and low oxygen evolution overpotential, its preparation method and its use. Background technique [0002] Electrodialysis is a relatively mature technology in the membrane separation process. It uses the potential difference as the driving force under the action of a DC electric field to separate the useless salts in the electrolyte from the solution by using the selective permeability of the ion exchange membrane. removal, so as to achieve the purpose of product concentration, refinement or purification. In addition to being widely used in the desalination of brackish water, food, medicine and chemical industry, electrodialysis has many other industrial applications, such as the treatment of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/46
CPCB01D61/46B01D61/422
Inventor 张光晋刘荣基曹宏斌石绍渊
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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