【摘 要】
：
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】
：
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.
其他文献
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
The microstmcture,electrical properties,and density of Dy2O3-doped ZnO-based varistor ceramics,prepared using high-energy ball milling (HEBM) and sintered at 80
The electrostatic interaction between additive and analyte is of great importance to non-aqueous capillary electrophoresis (NACE) separation. Three tetraalkylam
主要探讨非正态总体下的控制图优化设计问题.引入平均产品长度(APL)作为控制图性能的精确度量方法,针对一般控制图无法有效解决非正态总体的不对称性的情况,采用赋权方差法构
Making use of the invariant property of the equilibrium size distribution of the hydrogen bonding clusters formed in hydrogen bonding system of AaDd type, the a
Two kinds of streptavidin magnetic particles, namely streptavidin GoldMag particles and streptavidin amino terminal particles were prepared by the methods of ph
An improved shooting method was presented for solving the natural convention boundary layer equations,with a coupling of the velocity field to the temperature f
A polymer electrolyte based on poly(vinylidene)fluoride-hexafluoropropylene was prepared by evaporating the solvent of dimethyl for mamide, and non-woven fabric
Based on the exact analytical solution of ordinary differential equations,a truncation of the Taylor series of the exact solution to the Nth order leads to the
The oxidizing highly reactive absorbent was prepared from fly ash, industry lime, and an oxidizing additive M. Experiments of simultaneous desulfurization and d