TY - JOUR
T1 - Operando time-resolved diffuse reflection spectroscopy
T2 - The origins of photocatalytic water-oxidation activity of bismuth vanadate
AU - Miyasato, Ryo
AU - Fujiwara, Masazumi
AU - Uragami, Chiasa
AU - Sato, Haruyuki
AU - Yano, Toshihiro
AU - Hashimoto, Hideki
N1 - Funding Information:
The authors would like to thank Prof. Ryu Abe at Kyoto University for kind instruction and guidance to perform the experiments of water oxidation. HH thanks JSPS KAKENHI, Grant-in-Aids for Basic Research (B) (No. 16H04181) and Scientific Research on Innovative Areas ?Innovations for Light-Energy Conversion (I4LEC)? (No.17H06433 & No. 17H0637) for financial support.
Funding Information:
The authors would like to thank Prof. Ryu Abe at Kyoto University for kind instruction and guidance to perform the experiments of water oxidation. HH thanks JSPS KAKENHI , Grant-in-Aids for Basic Research (B) (No. 16H04181 ) and Scientific Research on Innovative Areas “Innovations for Light-Energy Conversion (I 4 LEC)” (No. 17H06433 & No. 17H0637 ) for financial support.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/5/15
Y1 - 2020/5/15
N2 - Photocatalytic water splitting has been believed to be a key technology for the construction of a sustainable society based on a renewable energy source. Understanding the exact mechanisms of oxygen evolution by water-splitting reaction, which has been regarded as a bottleneck to realize the water splitting in practical basis, should help us to enhance solar-to-hydrogen energy conversion efficiency. Here, we present a detailed investigation based on two types of bismuth vanadate (BiVO4) crystals. One is a monoclinic scheelite crystal that forms a truncated tetragonal bipyramidal shape (MS), and the other is a tetragonal zircon crystal that forms an octahedral shape (TZ). MS, which has relatively higher photocatalytic activity of water oxidation, rarely adsorbed reduced mediator (Fe2+). Operando time-resolved diffuse reflection spectral measurement demonstrated, for the first time, that the surface holes of MS crystals show extremely high reactivity, while those of TZ crystals show poor reactivity. Our investigation would promote an essential understanding of the photocatalytic reaction mechanism of water oxidation.
AB - Photocatalytic water splitting has been believed to be a key technology for the construction of a sustainable society based on a renewable energy source. Understanding the exact mechanisms of oxygen evolution by water-splitting reaction, which has been regarded as a bottleneck to realize the water splitting in practical basis, should help us to enhance solar-to-hydrogen energy conversion efficiency. Here, we present a detailed investigation based on two types of bismuth vanadate (BiVO4) crystals. One is a monoclinic scheelite crystal that forms a truncated tetragonal bipyramidal shape (MS), and the other is a tetragonal zircon crystal that forms an octahedral shape (TZ). MS, which has relatively higher photocatalytic activity of water oxidation, rarely adsorbed reduced mediator (Fe2+). Operando time-resolved diffuse reflection spectral measurement demonstrated, for the first time, that the surface holes of MS crystals show extremely high reactivity, while those of TZ crystals show poor reactivity. Our investigation would promote an essential understanding of the photocatalytic reaction mechanism of water oxidation.
KW - Bismuth vanadate
KW - Carrier dynamics
KW - Photocatalytic water splitting
KW - Transient absorption
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U2 - 10.1016/j.jphotochem.2020.112493
DO - 10.1016/j.jphotochem.2020.112493
M3 - Article
AN - SCOPUS:85082831131
VL - 395
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
M1 - 112493
ER -
