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Modified Carbon Papers as Electrode Materials of all-Vanadium Redox Flow Battery

Published online by Cambridge University Press:  15 May 2013

Chih-Hsing Leu ,
Shu-Yuan Chuang ,
Kan-Lin Hsueh ,
Jia-Ming Huang ,
Chia-Chun Chung ,
Chun-Hsing Wu ,
Hsiao-Hsuan Hsu ,
Yi-Ray Chen  and
Wen-Sheng Chang
Chih-Hsing Leu*
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China
Shu-Yuan Chuang
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China Department of Materials Engineer, Ming Chi University of Technology, Taipei 243, Taiwan, Republic of China
Kan-Lin Hsueh
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China
Jia-Ming Huang
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China
Chia-Chun Chung
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China
Chun-Hsing Wu
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China
Hsiao-Hsuan Hsu
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China
Yi-Ray Chen
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China
Wen-Sheng Chang
Affiliation:
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan, Republic of China
*
*Fax: +886-3-5820030, E-mail address:CHLeu@itri.org.tw
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Abstract

The electrode materials for VRFB should possess higher electric conductivity, corrosion resistance and hydrophilic properties in sulfuric acid. The characteristics of the electrode materials affect the stability and the energy efficiency of VRFB. Carbon materials are the best suited for VRFB applications. In this study, the calcined treatment, acid treatment and ozone treatment were used to modify the surface of carbon papers. The redox reaction of [VO]2+/[VO2]+ on the modified carbon papers was evaluated by cyclic voltammetry (CV). The surface compositions of carbon materials were analyzed by X-ray photoelectron spectrometry (XPS). The experimental results reveal that three oxidative methods enhance the redox reaction of [VO]2+/[VO2]+. The calcined treatments and acid treatments also enhanced hydrolysis reaction. The mole ratio of O/C apparently increased, but the binding energy of C1s and O1s were not chemically shifted in the acid treatment. The intensity of binding energy of O1s, between 532 eV and 534 eV, apparently increased in the ozone and calcined treatments. The Ox treated samples were more hydrophilic than the Oz treated samples. In the Ox treated samples, the decrease of Rct value indicates that was contributed from the redox reaction of [VO]2+/[VO2]+ and hydrolysis reaction. It does not completely benefit the energy efficiency of VRFB. The 5 x 5 cm2 modified carbon papers were used as electrode materials in the VRFB. The voltage efficiency, coulomb efficiency and energy efficiency reached 93 %, 90 % and 83 %, respectively, at a current density of 12 mA．cm-2 at 0.8-1.8 V.

Keywords

energy storagex-ray photoelectron spectroscopy (XPS)surface chemistry
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1492: Symposium D/G – Materials for Sustainable Development—Challenges and Opportunities , 2013 , pp. 15 - 23
Copyright
Copyright © Materials Research Society 2013 

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