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Title: General and robust photothermal-heating-enabled high-efficiency photoelectrochemical water splitting
Authors: He, Bing
Jia, Songru
Zhao, Mingyang
Wang, Yang
Chen, Tao
Zhao, Shiqiang
Li, Zhen
Lin, Zhiqun
Zhao, Yanli
Liu, Xueqin
Keywords: Engineering::Materials
Issue Date: 2021
Source: He, B., Jia, S., Zhao, M., Wang, Y., Chen, T., Zhao, S., Li, Z., Lin, Z., Zhao, Y. & Liu, X. (2021). General and robust photothermal-heating-enabled high-efficiency photoelectrochemical water splitting. Advanced Materials, 33(16), 2004406-.
Project: NRF-NRFI2018-03 
Journal: Advanced Materials 
Abstract: The ability of photoanodes to simultaneously tailor light absorption, charge separation, and water oxidation processes represents an important endeavor toward highly efficient photoelectrochemical (PEC) water splitting. Here, a robust strategy is reported to render markedly improved PEC water splitting via sandwiching a photothermal Co3 O4 layer between a BiVO4 photoanode film and an FeOOH/NiOOH electrocatalyst sheet. The deposited Co3 O4 layer manifests compelling photothermal effect upon near-infrared irradiation and raises the temperature of the photoanodes in situ, leading to extended light absorption, enhanced charge transfer, and accelerated water oxidation kinetics simultaneously. The judiciously designed NiOOH/FeOOH/Co3 O4 /BiVO4 photoanode renders a superior photocurrent density of 6.34 mA cm-2 at 1.23 V versus a reversible reference electrode (VRHE ) with outstanding applied bias photon-to-current efficiency of 2.72% at 0.6 VRHE . In addition to the metal oxide, a wide variety of metal sulfides, nitrides, and phosphides (e.g., CoS, CoN, and CoP) can be exploited as the heaters to yield high-performance BiVO4 -based photoanodes. Apart from BiVO4 , other metal oxides (e.g., Fe2 O3 and TiO2 ) can also be covered by photothermal materials to impart significantly promoted water splitting. This simple yet general strategy provides a unique platform to capitalize on their photothermal characteristics to engineer high-performing energy conversion and storage materials and devices.
ISSN: 0935-9648
DOI: 10.1002/adma.202004406
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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