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Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO 2 Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction
Author(s) -
Jiang Tengfei,
Zhao Yu,
Liu Mingyue,
Chen Yu,
Xia Zhengquan,
Xue Huaiguo
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800056
Subject(s) - photocathode , doping , charge carrier , materials science , carrier lifetime , optoelectronics , acceptor , hydrothermal circulation , water splitting , energy conversion efficiency , photocatalysis , chemistry , chemical engineering , electron , physics , condensed matter physics , biochemistry , quantum mechanics , silicon , engineering , catalysis
Highly active and stable photocathodes are desirable for efficient photoelectrochemical water reduction. However, most photocathode materials suffer from the short lifetime of photoinduced charge carriers resulting in low energy conversion efficiency. Herein, the authors present a novel strategy to enhance the lifetime of photoinduced charge carriers for hexagonal CuFeO 2 platelets based photocathode. The enhancement is realized by simply hydrothermal doping of Mg into CuFeO 2 . Quantitative phase composition analysis and characterizations are carried out for the Mg doped CuFeO 2 materials with varied doping contents. This doping route not only induces to more acceptor‐type states to increase the p‐type carrier concentration, but also improves conductivity of CuFeO 2 and facilitates easier carriers transport, which are the key factors for the lifetime enhancement. After systematical tuning of the doping amount, the authors find that when the Mg content reaches 0.1%, the CuFeO 2 presents the longest lifetime for the photoinduced charge carriers (0.8485 s) referring to an enhancement of 94% in the lifetime compared with pure CuFeO 2 .