TY - JOUR
T1 - Plate-like Sm2Ti2S2O5 Particles Prepared by a Flux-Assisted One-Step Synthesis for the Evolution of O2 from Aqueous Solutions by Both Photocatalytic and Photoelectrochemical Reactions
AU - Ma, Guijun
AU - Kuang, Yongbo
AU - Murthy, Dharmapura H.K.
AU - Hisatomi, Takashi
AU - Seo, Jeongsuk
AU - Chen, Shanshan
AU - Matsuzaki, Hiroyuki
AU - Suzuki, Yohichi
AU - Katayama, Masao
AU - Minegishi, Tsutomu
AU - Seki, Kazuhiko
AU - Furube, Akihiro
AU - Domen, Kazunari
N1 - Funding Information:
This work was financially supported by the Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO) and by Grants-in-Aid for Scientific Research (A) (No. 16H02417) and for Young Scientists (A) (No. 15H05494) from the Japan Society for the Promotion of Science (JSPS).
Publisher Copyright:
Copyright © 2018 American Chemical Society.
PY - 2018/6/28
Y1 - 2018/6/28
N2 - Sm2Ti2S2O5 (STSO) is a visible-light-responsive oxysulfide semiconductor photocatalyst with applications to water splitting. In this work, plate-like STSO particles were synthesized through a flux-assisted one-step method at various temperatures. The activities of these materials during photocatalytic and photoelectrochemical O2 evolution from aqueous solutions were investigated. Single-phase STSO with a single crystal habit was produced at 923 K, which is approximately 200 K lower than the temperatures required for previously reported methods, such as solid-state reactions and thermal sulfurization under a H2S flow. The STSO sample synthesized at the optimal temperature exhibited an AQE of 1.3 ± 0.2% at 420 nm during photocatalytic sacrificial O2 evolution. This efficiency is twice the values reported for specimens prepared using conventional methods. An STSO/Ti/Sn electrode fabricated by the particle transfer method generated a photoanodic current and evolved O2 by water oxidation with a Faradaic efficiency of approximately 70 ± 7%. The synthesis temperature yielding the highest activity was lower for photocatalytic O2 evolution than for photoelectrochemical O2 evolution. This work demonstrates the applicability of the flux method to the synthesis of well-crystallized oxysulfides having various particle sizes and intended for different uses.
AB - Sm2Ti2S2O5 (STSO) is a visible-light-responsive oxysulfide semiconductor photocatalyst with applications to water splitting. In this work, plate-like STSO particles were synthesized through a flux-assisted one-step method at various temperatures. The activities of these materials during photocatalytic and photoelectrochemical O2 evolution from aqueous solutions were investigated. Single-phase STSO with a single crystal habit was produced at 923 K, which is approximately 200 K lower than the temperatures required for previously reported methods, such as solid-state reactions and thermal sulfurization under a H2S flow. The STSO sample synthesized at the optimal temperature exhibited an AQE of 1.3 ± 0.2% at 420 nm during photocatalytic sacrificial O2 evolution. This efficiency is twice the values reported for specimens prepared using conventional methods. An STSO/Ti/Sn electrode fabricated by the particle transfer method generated a photoanodic current and evolved O2 by water oxidation with a Faradaic efficiency of approximately 70 ± 7%. The synthesis temperature yielding the highest activity was lower for photocatalytic O2 evolution than for photoelectrochemical O2 evolution. This work demonstrates the applicability of the flux method to the synthesis of well-crystallized oxysulfides having various particle sizes and intended for different uses.
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U2 - 10.1021/acs.jpcc.7b12087
DO - 10.1021/acs.jpcc.7b12087
M3 - Article
AN - SCOPUS:85048356900
SN - 1932-7447
VL - 122
SP - 13492
EP - 13499
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 25
ER -
