Premium
Improvement of BiVO 4 Photoanode Performance During Water Photo‐Oxidation Using Rh‐Doped SrTiO 3 Perovskite as a Co‐Catalyst
Author(s) -
Zhang Yaping,
Li Yang,
Ni Diqing,
Chen Zhiwei,
Wang Xiao,
Bu Yuyu,
Ao JinPing
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201902101
Subject(s) - materials science , oxygen evolution , water splitting , overpotential , photocurrent , dielectric spectroscopy , catalysis , perovskite (structure) , rhodium , noble metal , chemical engineering , oxygen , electrochemistry , inorganic chemistry , photocatalysis , metal , electrode , optoelectronics , chemistry , organic chemistry , engineering , metallurgy , biochemistry
In this work, a water splitting photoanode composed of a BiVO 4 thin film surface modified by the deposition of a rhodium (Rh)‐doped SrTiO 3 perovskite is fabricated, and the Rh‐doped SrTiO 3 outer layer exhibits special photoelectrochemical (PEC) oxygen evolution co‐catalytic activity. Controlled intensity modulated photo‐current spectroscopy, electrochemical impedance spectroscopy, and other electrochemical results indicate that the Rh on the perovskite provide an oxidation active site during the PEC water oxidation process by reducing the reaction energy barrier for water oxidation. Theoretical calculations indicate that the water oxidation reaction is more likely to occur on the (110) crystal plane of Rh‐SrTiO 3 because the oxygen evolution reaction overpotential on the (110) crystal plane is reduced significantly. Therefore, the obtained BiVO 4 /Rh5%‐SrTiO 3 photoanode exhibits an optimized PEC performance. In particular, it facilitates the saturation of the photocurrent density. Thus, the presence of doped Rh in SrTiO 3 can reduce the amount of noble metals required while achieving excellent and stable oxygen evolution properties.