Corrosion behavior of a positive graphite electrode in vanadium redox flow battery

a b s t r a c t The graphite plate is easily suffered from corosion because of CO2 evolution when it acts as the positive electrode for vanadium redox flow battery. The aim is to obtain the initial potential for gas evolution on a positive graphite electrode in 2 mol dm −3 H2SO4 + 2 mol dm −3 VOSO4 solution. The effects of polarization potential, operating temperature and polarization time on extent of graphite corrosion are investigated by potentiodynamic and potentiostatic techniques. The surface characteristics of graphite electrode before and after corrosion are examined by scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. The results show that the gas begins to evolve on the graphite electrode when the anodic polarization potential is higher than 1.60 V vs saturated calomel electrode at 20 ◦C. The CO2 evolution on the graphite electrode can lead to intergranular corrosion of the graphite when the polarization potential reaches 1.75 V. In addition, the functional groups of COOH and C O introduced on the surface of graphite electrode during corrosion can catalyze the formation of CO2, therefore, accelerates

[1]  R. Socha,et al.  XPS and NMR studies of phosphoric acid activated carbons , 2008 .

[2]  R. McCreery,et al.  Electron Transfer Kinetics of Aquated Fe + 3 / + 2, Eu + 3 / + 2, and V + 3 / + 2 at Carbon Electrodes Inner Sphere Catalysis by Surface Oxides , 1993 .

[3]  H. Estrade-szwarckopf.  XPS photoemission in carbonaceous materials: A “defect” peak beside the graphitic asymmetric peak , 2004 .

[4]  K. Aldas,et al.  Application of a two-phase 'ow model for natural convection in an electrochemical cell , 2005 .

[5]  Steven G. Bratsch,et al.  Standard Electrode Potentials and Temperature Coefficients in Water at 298.15 K , 1989 .

[6]  Jianguo Liu,et al.  A significantly improved membrane for vanadium redox flow battery , 2010 .

[7]  A. Proctor,et al.  X-ray photoelectron spectroscopic studies of carbon fibre surfaces. I. carbon fibre spectra and the effects of heat treatment , 1982 .

[8]  B. Tian,et al.  Proton conducting composite membrane from Daramic/Nafion for vanadium redox flow battery , 2004 .

[9]  Frank C. Walsh,et al.  Modelling the effects of oxygen evolution in the all-vanadium redox flow battery , 2010 .

[10]  Koichi Murakami,et al.  Bubble Effects on the Solution IR Drop in a Vertical Electrolyzer Under Free and Forced Convection , 1980 .

[11]  Faizur Rahman,et al.  Vanadium redox battery: Positive half-cell electrolyte studies , 2009 .

[12]  A. Salvi,et al.  XPS determination of oxygen‐containing functional groups on carbon‐fibre surfaces and the cleaning of these surfaces , 1990 .

[13]  Maria Skyllas-Kazacos,et al.  Investigation of the V(V)/V(IV) system for use in the positive half-cell of a redox battery , 1985 .

[14]  Yong Wang,et al.  The corrosion of PEM fuel cell catalyst supports and its implications for developing durable catalysts , 2009 .

[15]  P. Boissonneau,et al.  An experimental investigation of bubble-induced free convection in a small electrochemical cell , 2000 .

[16]  S. Maaß,et al.  Carbon support oxidation in PEM fuel cell cathodes , 2008 .

[17]  Frank C. Walsh,et al.  Dynamic modelling of hydrogen evolution effects in the all-vanadium redox flow battery , 2010 .

[18]  Maria Skyllas-Kazacos,et al.  A study of the V(II)/V(III) redox couple for redox flow cell applications , 1985 .

[19]  Ji-Ming Hu,et al.  Oxygen evolution reaction on IrO2-based DSA® type electrodes: kinetics analysis of Tafel lines and EIS , 2004 .

[20]  A. Salvi,et al.  XPS/XAES study of carbon fibres during thermal annealing under UHV conditions , 1992 .

[21]  C. Roy,et al.  ESCA characterization of commercial carbon blacks and of carbon blacks from vacuum pyrolysis of used tires , 1994 .

[22]  Jianguo Liu,et al.  Thermodynamic Investigation of Electrolytes of the Vanadium Redox Flow Battery (II): A Study on Low-Temperature Heat Capacities and Thermodynamic Properties of VOSO4·2.63H2O(s) , 2010 .

[23]  E. Savinova,et al.  Influence of Nafion® ionomer on carbon corrosion , 2010 .

[24]  C. Rydh.  Environmental assessment of vanadium redox and lead-acid batteries for stationary energy storage , 1999 .

[25]  X. Jian,et al.  Preparation of chloromethylated/quaternized poly(phthalazinone ether ketone) anion exchange membrane materials for vanadium redox flow battery applications , 2010 .

[26]  Jian Chen,et al.  Modification of Nafion membrane using interfacial polymerization for vanadium redox flow battery applications , 2008 .