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Electrochemical modification of graphite felt electrode for vanadium redox flow battery

  The activity of graphite felt electrode can be improved by electrochemical treatment, the increase of the electrode activity is attributed to the increase in the number of functional groups on the surface of carbon fiber and the increase of the specific surface area of the COOH.

  The small capacity of the battery has been successfully applied in human life, further research and development of new environmentally friendly battery suitable for large-scale energy storage, development and utilization of new energy sources, will have great social and economic significance. All vanadium redox flow battery can be regarded as the representative of the new energy storage battery, compared with other batteries it has a unique advantage.

  At present, the vanadium battery has been abroad applied to wind power plant, power station power peaking and solar photovoltaic demonstration operation. But the development of vanadium battery is still limited, the electrode material is a very important factor.

  The electrode material is mainly divided into metal electrode and carbon electrode, wherein the carbon electrode with good stability reflects the greater advantage, and the carbon electrode, graphite felt materials with its advantages of real surface area is much larger than the geometric surface area and occupies the dominant position.

  Using concentrated sulfuric acid liquid phase oxidation and air oxidation method to activate the graphite felt, it was found that the electrochemical performance of the graphite felt can be greatly improved,although the process is simple, the process is simple, the operation is small, and the oxidation reaction is not easy to control.

  The surface treatment of graphite felt by electrochemical oxidation, electrochemical performance of vanadium battery in the graphite felt electrode before and after treatment were investigated, which were characterized by FT-IR, SEM, BET and XPS, and improve the activity of the preliminary analysis,