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In situ growth of ultrathin Co-MOF nanosheets on α-Fe 2 O 3 hematite nanorods for efficient photoelectrochemical water oxidation

Zhang, Qi; Wang, Hongyan; Dong, Yixin; Yan, Jitong; Ke, Xuebin; Wu, Quanping; Xue, Song

Authors

Qi Zhang

Hongyan Wang

Yixin Dong

Jitong Yan

Quanping Wu

Song Xue

Abstract

Efficient charge transport is an important factor in photoelectrochemical (PEC) water splitting. The charge transfer at the semiconductor/electrolyte interface is of great importance, especially for the complex water oxidation reaction. In this study, we explored the feasibility of improving charge transfer efficiency at the interface of semiconductor/electrolyte by in situ growth of Co based Metal-Organic Frame work (Co-MOF) through a facile ion-exchanging method. Under optimized conditions, the Co-MOF nanosheet-modified hematite gave a photocurrent density of 2.0 mA cm−2 (200% improvement) at 1.23 VRHE with a cathodic shift of 180 mV in the photocurrent onset potential, in comparison to bare α-Fe2O3 (0.71 mA cm−2@1.23 VRHE). To elucidate the role of Co-MOF, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy and Mott-Schottky measurements were carried out. It was found that the atomically distributed Co2+ in Co-MOF possessed excellent hole storage capability and charge transfer efficiency, as evidenced by the high surface capacitance and extremely low surface charge transfer resistance.

Journal Article Type Article
Publication Date Sep 1, 2018
Journal Solar Energy
Print ISSN 0038-092X
Electronic ISSN 1471-1257
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 171
Pages 388-396
Institution Citation Zhang, Q., Wang, H., Dong, Y., Yan, J., Ke, X., Wu, Q., & Xue, S. (2018). In situ growth of ultrathin Co-MOF nanosheets on α-Fe 2 O 3 hematite nanorods for efficient photoelectrochemical water oxidation. Solar Energy, 171, 388-396. https://doi.org/10.1016/j.solener.2018.06.086
DOI https://doi.org/10.1016/j.solener.2018.06.086
Keywords Hematite; Photoelectrochemical water splitting; Metal–organic framework; Photocurrent
Publisher URL https://www.sciencedirect.com/science/article/pii/S0038092X18306376?via%3Dihub
Additional Information This is the accepted manuscript of an article published in Solar energy, 2018. The version of record is available at the DOI link in this record.

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Copyright Statement
©2019, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/




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