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Role of Bismuth in the Electrokinetics of Silicon Photocathodes for Solar Rechargeable Vanadium Redox Flow Batteries
Author(s) -
Flox Cristina,
MurciaLópez Sebastián,
Carretero Nina M.,
Ros Carles,
Morante Juan R.,
Andreu Teresa
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201701879
Subject(s) - bismuth , photocurrent , redox , photovoltaics , silicon , vanadium , electrochemistry , materials science , anode , bismuth vanadate , chemistry , photovoltaic system , optoelectronics , inorganic chemistry , electrode , photocatalysis , catalysis , electrical engineering , biochemistry , metallurgy , engineering
The ability of crystalline silicon to photoassist the V 3+ /V 2+ cathodic reaction under simulated solar irradiation, combined with the effect of bismuth have led to important electrochemical improvements. Besides the photovoltage supplied by the photovoltaics, additional decrease in the onset potentials, high reversibility of the V 3+ /V 2+ redox pair, and improvement in the electrokinetics were attained thanks to the addition of bismuth. In fact, Bi 0 deposition has shown to slightly decrease the photocurrent, but the significant enhancement in the charge transfer, reflected in the overall electrochemical performance clearly justifies its use as additive in a photoassisted system for maximizing the efficiency of solar charge to battery.