TY - JOUR
T1 - Photoinduced charge-transfer dynamics in WO3/BiVO4 photoanodes probed through midinfrared transient absorption spectroscopy
AU - Grigioni, Ivan
AU - Abdellah, Mohamed
AU - Corti, Annamaria
AU - Dozzi, Maria Vittoria
AU - Hammarström, Leif
AU - Selli, Elena
N1 - Publisher Copyright:
© 2018 American Chemical Society
PY - 2018
Y1 - 2018
N2 - The dynamics of photopromoted electrons in BiVO4, WO3, and WO3/BiVO4 heterojunction electrodes has been directly probed by transient absorption (TA) midinfrared (mid-IR) spectroscopy in the picosecond to microsecond time range. By comparison of the dynamics recorded with the two individual oxides at 2050 cm−1 with that of the heterojunction system after excitation at different wavelengths, electron-transfer processes between selectively excited BiVO4 and WO3 have been directly tracked for the first time. These results support the charge carrier interactions which were previously hypothesized by probing the BiVO4 hole dynamics through TA spectroscopy in the visible range. Nanosecond mid-IR TA experiments confirmed that charge carrier separation occurs in WO3/BiVO4 electrodes under visible-light excitation, persisting up to the microsecond time scale.
AB - The dynamics of photopromoted electrons in BiVO4, WO3, and WO3/BiVO4 heterojunction electrodes has been directly probed by transient absorption (TA) midinfrared (mid-IR) spectroscopy in the picosecond to microsecond time range. By comparison of the dynamics recorded with the two individual oxides at 2050 cm−1 with that of the heterojunction system after excitation at different wavelengths, electron-transfer processes between selectively excited BiVO4 and WO3 have been directly tracked for the first time. These results support the charge carrier interactions which were previously hypothesized by probing the BiVO4 hole dynamics through TA spectroscopy in the visible range. Nanosecond mid-IR TA experiments confirmed that charge carrier separation occurs in WO3/BiVO4 electrodes under visible-light excitation, persisting up to the microsecond time scale.
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U2 - 10.1021/jacs.8b08309
DO - 10.1021/jacs.8b08309
M3 - Article
C2 - 30296074
AN - SCOPUS:85055355820
SN - 0002-7863
VL - 140
SP - 14042
EP - 14045
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 43
ER -