Graphene oxide-modified electrode material for energy storage flow battery

An electrode material, the technology of all-vanadium redox flow battery, applied in the direction of battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of unstable adhesion, consume a lot of manpower and material resources, reduce charge transfer impedance, etc., and achieve omission of processing and time, save equipment and capital investment, and enrich the effect of oxygen-containing functional groups

Active Publication Date: 2016-04-27
INST OF CHEM CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

Studies have shown that graphite felt electrodes loaded with iridium (Ir), indium (In) and other metals have good electrochemical catalytic activity, and pyrolytic reduction of H 2 IrCl 6 The preparation of Ir-modified carbon felt electrodes reduces the V(IV)/V(V) pair charge transfer resistance, but at the same time reduces the hydrogen evolution overpotential of the electrode, so it can only be applied to the modification of vanadium battery cathode materials
Bismuth (Bi) metal has a high hydrogen evolution overpotential. By thermal decomposition, electrodepositing nano-Bi metal on the surface of graphite felt can not only inhibit hydrogen evolution, but also promote the electrochemical redox of V(II)/V(III) reaction, but the metals Bi and Ir are noble metals, which are expensive, which limits their large-scale application
mn 3 o 4 , Nb 2 o 5 Such metal oxides can reduce the activation energy of the electrode reaction, increase the electrode reaction rate, reduce the chemical reaction kinetics, and have a good catalytic effect on the electrode reaction of the vanadium battery, but problems such as their low conductivity and unstable adhesion need to be solved urgently; (2 ) use heat treatment, acid treatment and electro-oxidation method to process gr...

Method used

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  • Graphene oxide-modified electrode material for energy storage flow battery
  • Graphene oxide-modified electrode material for energy storage flow battery
  • Graphene oxide-modified electrode material for energy storage flow battery

Examples

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Effect test

Embodiment 1

[0030] Take 0.3g of graphite powder with a purity of 99.9999%, 2g of potassium permanganate, 36ml of concentrated sulfuric acid, and 4ml of concentrated phosphoric acid, put them into a round-bottomed flask, mix the three fully, place the round-bottomed flask in a magnetic stirring pot, and put it in an oil bath. Set the temperature to 45°C and the reaction time to 24 hours, place the prepared graphene oxide in ice water, ensure that the temperature of the ice-water bath is 1°C, add 33% hydrogen peroxide to the graphene oxide until no bubbles are generated in the solution, Take the solution from the previous step and put it into a 50ml centrifuge tube, add 30ml, 2mol / L hydrochloric acid solution, centrifuge for 15min at a speed of 2000r / min, wash three times, take the clear liquid and add deionized water, centrifuge for 15min and wash at a speed of 6000r / min , until the pH of the solution is 6, a graphene oxide precipitate is obtained, containing hydroxyl, carboxyl, epoxy, and ...

Embodiment 2

[0033] Take 1.5g of graphite powder with a purity of 99.9999%, 10g of potassium permanganate, 1g of sodium nitrate, 180ml of concentrated sulfuric acid, and 20ml of concentrated phosphoric acid, put them into a round-bottomed flask, mix them well, and place the round-bottomed flask in a magnetic stirring pot , oil bath, set the temperature to 50°C, and the reaction time is 30 hours, place the prepared graphene oxide in ice water, ensure that the temperature of the ice-water bath is 3°C, add 33% hydrogen peroxide to the graphene oxide until it is in the solution No bubbles are generated, take the solution from the previous step and put it into a 50ml centrifuge tube, add 30ml, 2mol / L hydrochloric acid solution, centrifuge for 15min at a speed of 3000r / min, wash three times, take the clear solution and add deionized water, centrifuge and wash for 30min, The rotating speed is 7000r / min until the pH of the solution is 6, and the graphene oxide precipitate is obtained, which contain...

Embodiment 3

[0036] Take 1.5g of graphite powder with a purity of 99.9999%, 15g of potassium permanganate, 1g of potassium persulfate, 180ml of concentrated sulfuric acid, and 20ml of concentrated phosphoric acid, put them into a round-bottomed flask, mix them well, and place the round-bottomed flask in a magnetic stirring pot In an oil bath, the set temperature is 55°C, and the reaction time is 26 hours. The prepared graphene oxide is placed in ice water to ensure that the temperature of the ice-water bath is 5°C, and 33% hydrogen peroxide is added to the graphene oxide until the solution is If there is no bubbles in the medium, take the solution from the previous step and put it into a 50ml centrifuge tube, add 30ml, 2mol / L hydrochloric acid solution, centrifuge for 45min at a speed of 4000r / min, wash three times, take the clear solution and add deionized water, centrifuge and wash for 30min , rotation speed 8000r / min, until the pH of the solution is 7, graphene oxide precipitates are obt...

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Abstract

The invention relates to a graphene oxide-modified electrode material for an energy storage flow battery and a preparation method of the graphene oxide-modified electrode material. The electrode material comprises a carbon material matrix and a graphene oxide compound on the surface of the carbon material matrix. According to the method, graphene oxide is loaded on the surface of a carbon electrode by a hydrothermal process; the specific surface area of the modified electrode material is greatly increased; the contact area of an electrolyte and the electrode is increased; reactivity sites of the electrode and the electrolyte are increased; meanwhile, oxygen-containing functional groups of the modified electrode are rapidly increased; the internal resistance of electrochemical reaction of an all-vanadium redox flow battery electrode and the transport resistance of electrons are reduced; and overpotential of the battery under high current density is reduced, so that the voltage efficiency and the energy efficiency of an all-vanadium redox flow battery under the high current density are greatly improved.

Description

technical field [0001] The invention relates to the preparation and application of an electrode material for an energy storage liquid flow battery, in particular to an electrode for an all-vanadium flow battery and its application. Background technique [0002] Redox flow battery (VRB) is one of the most promising large-scale energy storage technologies. All-vanadium redox flow battery is a secondary battery with vanadium ion solution as positive and negative active materials, mainly composed of vanadium electrolyte , separator, electrode and current collector. The positive electrode electrolyte is V (V) and V (IV) sulfuric acid solution, and the negative electrode is V (III) and V (II) sulfuric acid solution. Through an external pump, the solution is pumped from the liquid storage tank into the battery stack, and the electrolyte flows through the graphite felt electrode for electrochemical reaction, and then the solution is transported back to the liquid storage tank. The...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/96H01M8/18
CPCH01M4/9083H01M4/96H01M8/188Y02E60/50
Inventor 郭玉国吴雄伟邓奇殷雅侠万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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