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This paper treats the polyacrylonitrile (PAN)-based graphite felt (GF) with hydrothermal NH4H2PO4 solution and adopts the treated GF as the positive electrode of all-vanadium redox flow battery (VRFB). Specifically, the GF was treated in a teflon-lined stainless-steel autoclave with 1.6M NH4H2PO4 solution for 4h at 60°C. Then, structure, composition and electrochemical properties of the GF were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), cyclicdoi:10.3303/cet1866019 doaj:2d5d68bc518f4c44b9d1d7ca228b6d09 fatcat:seor6qgobjey3buk2rdp5a6ydm