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CN-122025671-A - Electrode and preparation method thereof

CN122025671ACN 122025671 ACN122025671 ACN 122025671ACN-122025671-A

Abstract

The application provides an electrode and a preparation method thereof. The electrode comprises a carbon matrix and a SnO 2 /CeO 2 catalyst supported on the surface of the carbon matrix. The electrode of the application loads and deposits a layer of SnO 2 /CeO 2 catalyst on the surface of the electrode, which can effectively improve the specific surface area of the electrode and increase the active site of electrochemical reaction. When the method is applied to a flow battery, for example, the method is applied to an all-vanadium flow battery, hydrogen evolution reaction in the battery can be restrained, charge and discharge efficiency of the flow battery is improved, redox activity of vanadium ions is improved, and irreversible capacity loss caused by precipitation and precipitation of the vanadium ions on the surface of an electrode is prevented.

Inventors

  • LIU TIANJIAO
  • FAN WEIZHEN
  • SHI LITAO

Assignees

  • 广州天赐高新材料股份有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. An electrode comprises a carbon matrix and a SnO 2 /CeO 2 catalyst supported on the surface of the carbon matrix.
  2. 2. The electrode of claim 1, wherein the SnO 2 /CeO 2 catalyst is present in an amount of 0.1% -10% by mass based on the mass of the electrode.
  3. 3. The electrode of claim 1, wherein the SnO 2 /CeO 2 catalyst is present in an amount of 0.3% -10% by mass based on the mass of the electrode.
  4. 4. The electrode of claim 1, wherein the carbon matrix is selected from at least one of graphite felt, carbon cloth, and carbon paper.
  5. 5. A method of producing an electrode according to any one of claims 1 to 4, comprising: (1) Activating the carbon matrix to obtain an activated carbon matrix; (2) Mixing SnCl 2 ·2H 2 O、CeO 2 nano-particles with acid to obtain an electrolyte, wherein the acid is sulfuric acid or hydrochloric acid, the concentration of the SnCl 2 ·2H 2 O in the electrolyte is 0.01-0.5 mol/L, the concentration of the SnCl 2 ·2H 2 O、CeO 2 nano-particles is 0.05-2 mol/L, and the concentration of the CeO 2 nano-particles is 0.1-10 g/L; (3) And immersing the activated carbon matrix serving as a cathode electrode into the electrolyte, and electrochemically depositing a SnO 2 /CeO 2 catalyst on the surface of the carbon matrix.
  6. 6. The method according to claim 5, wherein the electrochemical deposition has a current density of 4-8 ma/cm 2 for 0.5-1.5 hours.
  7. 7. The preparation method of claim 5, wherein the size of the CeO 2 nano-particles is 10-50 nm.
  8. 8. The method according to claim 5, wherein the carbon substrate is at least one selected from the group consisting of graphite felt, carbon cloth and carbon paper.
  9. 9. The method of claim 5, wherein the step of activating the carbon matrix comprises: Placing the carbon matrix in deionized water, boiling for 1-2 hours, then placing in acid, treating for 8-12 hours at 80-120 ℃, washing the deionized water, and drying to obtain the activated carbon matrix, wherein the acid is selected from sulfuric acid or hydrochloric acid.
  10. 10. A flow battery comprising the electrode of any one of claims 1-4 or the electrode produced by the production method of any one of claims 5-9.

Description

Electrode and preparation method thereof Technical Field The application relates to the technical field of energy storage batteries, in particular to an electrode and a preparation method thereof. Background Along with the increasing problem of exhaustion of fossil energy resources and environmental pollution, the search for new energy and energy storage technologies is a problem that needs to be solved in the current energy development. As a novel efficient electrochemical energy storage battery, the flow battery, in particular the all-vanadium flow battery, has the characteristics of ultra-long circulation, flexible capacity, capacity expansion, high response speed, intrinsic safety and the like, and is widely focused in the field of new energy. In the charge and discharge process of the flow battery, hydrogen evolution reaction exists on the surface of the negative electrode, and the hydrogen evolution reaction competes with the main reaction in the flow battery to influence the charge and discharge efficiency of the flow battery. In addition, the hydrogen evolution reaction can also cause the change of the concentration of H + ions in the electrolyte to influence the conductivity of the electrolyte, the generation of hydrogen can also cause the increase of the air pressure in the battery to influence the structure and the performance of the battery, and potential safety hazards exist. In addition, oxidation and reduction of vanadium ions under the action of externally applied current widely exist in the charge and discharge processes of the all-vanadium redox flow battery, and as the electrodes of the redox flow battery are made of carbon matrix materials, carbon in the carbon matrix materials can be combined with the vanadium ions to generate insoluble precipitate under the action of externally applied current, and the active substances of electrolyte are consumed to cause irreversible capacity attenuation, so that industrialization and large-scale application of the redox flow battery are limited to a certain extent. Therefore, developing an electrode that can effectively inhibit hydrogen evolution reaction during the operation of a flow battery is a technical problem to be solved by those skilled in the art. Disclosure of Invention The application aims to provide an electrode and a preparation method thereof, which can effectively inhibit hydrogen evolution reaction in the working process of a flow battery, improve the charge and discharge efficiency of the flow battery and prevent irreversible capacity loss caused by precipitation and precipitation of vanadium ions on the surface of the electrode. The specific technical scheme is as follows: In a first aspect, the application provides an electrode comprising a carbon substrate and a tin oxide/cerium oxide (SnO 2/CeO2) catalyst supported on the surface of the carbon substrate. In one embodiment of the application, the mass percentage of the SnO 2/CeO2 catalyst is 0.1% -10%, preferably 0.3% -10% based on the mass of the electrode. In one embodiment of the present application, the carbon substrate is selected from at least one of graphite felt, carbon cloth and carbon paper. A second aspect of the present application provides a method for producing an electrode according to the first aspect of the present application, comprising: (1) Activating the carbon matrix to obtain an activated carbon matrix; (2) Mixing SnCl 2·2H2O、CeO2 nano-particles with acid to obtain an electrolyte, wherein the acid is sulfuric acid or hydrochloric acid, the concentration of the SnCl 2·2H2 O in the electrolyte is 0.01-0.5 mol/L, the concentration of the SnCl 2·2H2O、CeO2 nano-particles is 0.05-2 mol/L, and the concentration of the CeO 2 nano-particles is 0.1-10 g/L; (3) And immersing the activated carbon matrix serving as a cathode electrode into the electrolyte, and electrochemically depositing a SnO 2/CeO2 catalyst on the surface of the carbon matrix. In one embodiment of the application, the current density of the electrochemical deposition is 4-8 mA/cm 2, and the time is 0.5-1.5 hours. In one embodiment of the present application, the CeO 2 nanoparticles have a size of 10 to 50nm. In one embodiment of the present application, the carbon substrate is selected from at least one of graphite felt, carbon cloth and carbon paper. In one embodiment of the present application, the step of activating the carbon substrate comprises: Placing the carbon matrix in deionized water, boiling for 1-2 hours, then placing in acid, treating for 8-12 hours at 80-120 ℃, washing the deionized water, and drying to obtain the activated carbon matrix, wherein the acid is selected from sulfuric acid or hydrochloric acid. A third aspect of the application provides a flow battery comprising an electrode according to the first aspect of the application or an electrode produced by a method according to the second aspect of the application. The application has the beneficial effects that: the applicatio