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Single‐Site Active Cobalt‐Based Photocatalyst with a Long Carrier Lifetime for Spontaneous Overall Water Splitting
Author(s) -
Liu Wei,
Cao Linlin,
Cheng Weiren,
Cao Yuanjie,
Liu Xiaokang,
Zhang Wei,
Mou Xiaoli,
Jin Lili,
Zheng Xusheng,
Che Wei,
Liu Qinghua,
Yao Tao,
Wei Shiqiang
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201704358
Subject(s) - water splitting , photocatalysis , oxygen evolution , catalysis , cobalt , photochemistry , charge carrier , materials science , adsorption , photocatalytic water splitting , oxygen , chemistry , optoelectronics , inorganic chemistry , biochemistry , organic chemistry , electrode , electrochemistry
An active and stable photocatalyst to directly split water is desirable for solar‐energy conversion. However, it is difficult to accomplish overall water splitting without sacrificial electron donors. Herein, we demonstrate a strategy via constructing a single site to simultaneously promote charge separation and catalytic activity for robust overall water splitting. A single Co 1 ‐P 4 site confined on g‐C 3 N 4 nanosheets was prepared by a facile phosphidation method, and identified by electron microscopy and X‐ray absorption spectroscopy. This coordinatively unsaturated Co site can effectively suppress charge recombination and prolong carrier lifetime by about 20 times relative to pristine g‐C 3 N 4 , and boost water molecular adsorption and activation for oxygen evolution. This single‐site photocatalyst exhibits steady and high water splitting activity with H 2 evolution rate up to 410.3 μmol h −1 g −1 , and quantum efficiency as high as 2.2 % at 500 nm.