【摘 要】
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PAN-based graphite feIt (PGF)treated in 98% sulphuric acid for 5 h and then kept at 450 ℃ for 2 h was evaluated for their electrochemical performance as electr
【机 构】
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School of Chemistry and Chemical Engineering,Institute of Physics
论文部分内容阅读
PAN-based graphite feIt (PGF)treated in 98% sulphuric acid for 5 h and then kept at 450 ℃ for 2 h was evaluated for their electrochemical performance as electrodes of vanadium redox battery(VRB). Structure and characteristic of treated PAN-based graphite felt(TPGF) were determined by means of Fourier Transform Infrared Spectroscopy,Scanning Electron Microscopy, Brunauer-Einlrlett-Teller surface area analysis and VRB test system.The results show that the acid and heat synergistic effect increase the number of-COOH functional groups on the PGF surface. and the PGF is eroded by sulphuric acid oxidation.resulting in the surface area increases from 0.31 m2/g to 0.45 m2/g.The V(Ⅱ)/V(Ⅲ)redox reaction is electrochemically reversible on the TPGF electrode, while the V(Ⅳ)/V(Ⅴ)couple is a quasi reversible process.The diflusion coeffcients of the oxidation for V(Ⅳ)/V(Ⅴ)obtained from the scope of peak current Ip vs scan rate v1/2 is 4.4x10-5cm2/s. The improvement of electrochemical activity for the electrode is mainly ascribed to the increase of the number of-C00H groups on the TPGF,which behaves as active sites catalyzing the vanadium species reactions and accelerating electron transfer reaction and oxygen transfer.
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