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Effect of KMnO4 modified graphite felt on the performance of vanadium battery

  Vanadium battery is a new type of energy storage battery developed in recent years, because of its high energy efficiency and long service life.

  Environmental friendly and cheap, operating and maintenance costs low, many of the characteristics of the rapid development of. But at present, there are some problems in vanadium battery. There are many factors that affect the performance of vanadium battery, including the electrode material performance, the positive and negative electrode reaction is an important factor.

  Graphite felt has a series of excellent properties, such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, conductivity and thermal expansion coefficient, so it is used in the field of vanadium battery. However, it is found that the active surface area is smaller than the surface area, the surface energy is low, and the wettability is poor.

  By low temperature liquid phase oxidation method for surface oxidation of graphite felt, with different concentration and Potassium Permanganate solution at different temperature and acid solution on Potassium Permanganate graphite felt for processing, to obtain the performance of graphite felt electrode material excellent. The graphite felt surface becomes smooth after Potassium Permanganate solution treatment.

  The surface polar groups of the graphite felt treated by different Potassium Permanganate solution increased, and the hydrophilicity was improved. Graphite felt on the surface in the process of Potassium Permanganate solution deposition on the Potassium Permanganate, is not conducive to V (IV) in the above reaction.

  Another way to improve the activity of graphite felt is to deposit metal or metal oxide on the surface of graphite felt. Transition metal oxide or semiconductor compound.