TY - JOUR
T1 - Two-Dimensional Perovskite Oxynitride K2LaTa2O6N with an H+/K+ Exchangeability in Aqueous Solution Forming a Stable Photocatalyst for Visible-Light H2 Evolution
AU - Oshima, Takayoshi
AU - Ichibha, Tom
AU - Oqmhula, Kenji
AU - Hibino, Keisuke
AU - Mogi, Hiroto
AU - Yamashita, Shunsuke
AU - Fujii, Kotaro
AU - Miseki, Yugo
AU - Hongo, Kenta
AU - Lu, Daling
AU - Maezono, Ryo
AU - Sayama, Kazuhiro
AU - Yashima, Masatomo
AU - Kimoto, Koji
AU - Kato, Hideki
AU - Kakihana, Masato
AU - Kageyama, Hiroshi
AU - Maeda, Kazuhiko
N1 - Funding Information:
This work was supported by a Grant‐in‐Aid for Scientific Re‐search on Innovative Area “Mixed Anion (Project JP16H06438, JP16H06439, JP16H06440 and JP16H06441)” from the Japan Society for the Promotion of Science (JSPS). T.O. wishes to acknowledge support in the form of a JSPS Fellowship for Young Scientists (JP16J10084). Synchrotron XRD measurements were conducted at the BL02B2 beamline of SPring‐8, Japan (Proposal No. 2017B1265).
Funding Information:
This work was supported by a Grant-in-Aid for Scientific Re-search on Innovative Area “Mixed Anion (Project JP16H06438, JP16H06439, JP16H06440 and JP16H06441)” from the Japan Society for the Promotion of Science (JSPS). T.O. wishes to acknowledge support in the form of a JSPS Fellowship for Young Scientists (JP16J10084). Synchrotron XRD measurements were conducted at the BL02B2 beamline of SPring-8, Japan (Proposal No. 2017B1265).
Publisher Copyright:
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/6/8
Y1 - 2020/6/8
N2 - Undoped layered oxynitrides have not been considered as promising H2-evolution photocatalysts because of the low chemical stability of oxynitrides in aqueous solution. Here, we demonstrate the synthesis of a new layered perovskite oxynitride, K2LaTa2O6N, as an exceptional example of a water-tolerant photocatalyst for H2 evolution under visible light. The material underwent in-situ H+/K+ exchange in aqueous solution while keeping its visible-light-absorption capability. Protonated K2LaTa2O6N, modified with an Ir cocatalyst, exhibited excellent catalytic activity toward H2 evolution in the presence of I− as an electron donor and under visible light; the activity was six times higher than Pt/ZrO2/TaON, one of the best-performing oxynitride photocatalysts for H2 evolution. Overall water splitting was also achieved using the Ir-loaded, protonated K2LaTa2O6N in combination with Cs-modified Pt/WO3 as an O2 evolution photocatalyst in the presence of an I3−/I− shuttle redox couple.
AB - Undoped layered oxynitrides have not been considered as promising H2-evolution photocatalysts because of the low chemical stability of oxynitrides in aqueous solution. Here, we demonstrate the synthesis of a new layered perovskite oxynitride, K2LaTa2O6N, as an exceptional example of a water-tolerant photocatalyst for H2 evolution under visible light. The material underwent in-situ H+/K+ exchange in aqueous solution while keeping its visible-light-absorption capability. Protonated K2LaTa2O6N, modified with an Ir cocatalyst, exhibited excellent catalytic activity toward H2 evolution in the presence of I− as an electron donor and under visible light; the activity was six times higher than Pt/ZrO2/TaON, one of the best-performing oxynitride photocatalysts for H2 evolution. Overall water splitting was also achieved using the Ir-loaded, protonated K2LaTa2O6N in combination with Cs-modified Pt/WO3 as an O2 evolution photocatalyst in the presence of an I3−/I− shuttle redox couple.
KW - artificial photosynthesis
KW - layered materials
KW - mixed anion compound
KW - solar fuels
KW - water splitting
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U2 - 10.1002/anie.202002534
DO - 10.1002/anie.202002534
M3 - Article
C2 - 32134159
AN - SCOPUS:85082748635
SN - 1433-7851
VL - 59
SP - 9736
EP - 9743
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 24
ER -
