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Carbon paper decorated with tin dioxide particle via in situ electrodeposition as bifunctional electrode for vanadium redox flow battery
Author(s) -
He Xinkuai,
He Zhangxing,
Zou Qingtian,
Wu Luye
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5068
Subject(s) - bifunctional , flow battery , vanadium , electrochemistry , redox , tin , materials science , tin dioxide , electrode , chemical engineering , polarization (electrochemistry) , cyclic voltammetry , inorganic chemistry , chemistry , catalysis , metallurgy , organic chemistry , engineering , electrolyte
Summary This work describes a two‐step method of in situ electrodeposition and following oxidation to prepare carbon paper (CP) modified with tin dioxide (SnO 2 ) particle as bifunctional electrode for vanadium redox flow battery. Electrodeposition technique was employed to load metal tin particle on CP, which was subsequently oxidized to tin dioxide at high temperature. CPs modified by SnO 2 with different content (CP/SnO 2 ‐1, CP/SnO 2 ‐2, and CP/SnO 2 ‐3) were obtained by controlling electrodeposition time. CP/SnO 2 presents an increase in electrochemical performance including faster charge and mass transfer compared with pristine CP. Among all samples, CP/SnO 2 ‐2 with proper decorated SnO 2 exhibits superior electrocatalytic performances for V 3+ /V 2+ and VO 2 + /VO 2+ reactions. Raised performances can be attributed to that SnO 2 nanoparticles provide more active sites leading to rapid electrochemical kinetic of vanadium redox reactions. In addition, mass transfer can be accelerated due to the excellent hydrophilicity of SnO 2 . The cell using CP/SnO 2 ‐2 as bifunctional electrode exhibits better stability and higher capacity retention during 50‐cycle charge‐discharge test. The cell for CP/SnO 2 ‐2 shows higher energy and voltage efficiency, suggesting that introduction of SnO 2 can decrease electrochemical polarization. At 150 mA cm −2 , energy efficiency of the cell increases by 7.8% through using CP/SnO 2 ‐2.