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Electrocatalytic performance of TiO 2 with different phase state towards V 2+ /V 3+ reaction for vanadium redox flow battery
Author(s) -
Cheng Dixuan,
Cheng Gang,
He Zhangxing,
Dai Lei,
Wang Ling
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.4575
Subject(s) - vanadium , flow battery , cyclic voltammetry , electrochemistry , redox , materials science , anatase , dielectric spectroscopy , inorganic chemistry , faraday efficiency , electrode , catalysis , analytical chemistry (journal) , titanium dioxide , chemistry , composite material , electrolyte , photocatalysis , biochemistry , chromatography
Summary In this paper, titanium dioxide (TiO 2 ) nanoparticles were employed as catalysts towards V 2+ /V 3+ redox couple of vanadium redox flow battery (VRFB). The effect of TiO 2 phase on the electrocatalytic performance for negative couple was systematically investigated. The electrochemical properties of TiO 2 with different phase were assessed via cyclic voltammetry and electrochemical impedance spectroscopy by using AB as conductive agent. Obtained from the results, anatase TiO 2 (α‐TiO 2 ) exhibits superior electrocatalytic activity to rutile TiO 2 (γ‐TiO 2 ). The VRFB cell performs well at discharge capacity, voltage efficiency, and energy efficiency by employing α‐TiO 2 ‐modified negative electrode with current density varying between 50 and 100 mA cm −2 . The discharge capacity of α‐TiO 2 ‐modified cell with vanadium ion concentration of 1.6 M comes up to 113.5 mA h at 100 mA cm −2 current density, which is increased by 39.1 mA h after modification for negative electrode. Moreover, the corresponding energy efficiency increases by 7.5% after modification of α‐TiO 2 . Experimental results show that TiO 2 is an ideal catalyst for VRFB. Moreover, α‐TiO 2 demonstrates superior electrocatalytic performance to γ‐TiO 2 towards V 2+ /V 3+ reaction.