TY - JOUR
T1 - Electron Trap Analysis of Tin(II) Niobate Photocatalyst Particles Using Photoacoustic Infrared Spectroscopy
AU - Shinoda, Tatsuki
AU - Hayashi, Toshio
AU - Yamaguchi, Yuichi
AU - Kudo, Akihiko
AU - Murakami, Naoya
N1 - Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/7/20
Y1 - 2023/7/20
N2 - Photoabsorption of tin(II) niobate (SnNb2O6) photocatalyst particles, which possess the possible band position to allow overall water splitting and visible light absorption (ca. 2.3 eV of bandgap energy), was investigated by photoacoustic infrared spectroscopy (IR-PAS). With excited light irradiation, infrared absorption due to electron accumulation in SnNb2O6 appeared, and its spectral shape was in good agreement with that of tin(IV) oxide (SnO2) but not that of niobium(V) oxide (Nb2O5). The spectral matching results suggest that substitutional tetravalent tin (Sn4+) at the pentavalent niobium (Nb5+) site acts as an electron acceptor and that the energy levels of Sn4+ are mainly located at ca. 0.3 eV below the bottom of the conduction band.
AB - Photoabsorption of tin(II) niobate (SnNb2O6) photocatalyst particles, which possess the possible band position to allow overall water splitting and visible light absorption (ca. 2.3 eV of bandgap energy), was investigated by photoacoustic infrared spectroscopy (IR-PAS). With excited light irradiation, infrared absorption due to electron accumulation in SnNb2O6 appeared, and its spectral shape was in good agreement with that of tin(IV) oxide (SnO2) but not that of niobium(V) oxide (Nb2O5). The spectral matching results suggest that substitutional tetravalent tin (Sn4+) at the pentavalent niobium (Nb5+) site acts as an electron acceptor and that the energy levels of Sn4+ are mainly located at ca. 0.3 eV below the bottom of the conduction band.
UR - http://www.scopus.com/inward/record.url?scp=85165929804&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.3c02831
DO - 10.1021/acs.jpcc.3c02831
M3 - Article
AN - SCOPUS:85165929804
SN - 1932-7447
VL - 127
SP - 13706
EP - 13711
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 28
ER -