| It is extremely urgent to develop and utilize renewable and clean energy（such as wind、solar and tidal energy,etc.）,but its shortcomings such as intermittentity and volatility need to be matched with advanced large-scale energy storage.All-vanadium redox flow battery has a wide application prospect in large-scale energy storage,but the limited electrochemical performance of electrode materials is an important limiting factor in the development of all-vanadium redox flow battery.This article aims to improve the electrocatalysis of electrode materials.For the purpose of activity,the effect of Heteroatom-doping and electrocatalyst modification on the electrochemical performance of the electrode material was studied.The details are as follows:1.The boron（B）element was successfully introduced into the graphite fiber surface by high temperature pyrolysis of potassium tetraborate（K2B4O7）supported on the surface of the graphite felt.Compared with the blank group,the voltage efficiency of the experimental group was increased by 6.02%and the discharge capacity was increased by 34.85%under the current density of 100 mAcm-2.2.The phosphorus and Fuorine co-doped graphite felt（PF-GF）electrode was developed via high temperature pyrolysis.The studies showed the functional group on the electrode material surface effectively promotes the redox reaction of vanadium ions.The charge-discharge test shows that the energy and voltage efficiency of the experimental group are improved 10%and 5%relative to the blank group at a current density of 100 mA cm-2,and better cycling stability at high current densities of 120mA cm-2.3.The copper phthalocyanine modification produced a rich defect on the surface of the graphite felt electrode,providing rich reactive sites for the redox reaction of vanadium ions.Electrochemical tests show under the current density of 100 mA cm-2,the energy efficiency and voltage efficiency of the assembled battery are improved by12%and 10%relative to the blank group. |
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