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Title: Nanostructured iron vanadate photoanodes with enhanced visible absorption and charge separation
Authors: Zhang, Mengyuan
Fang, Yanan
Tay, Ying Fan
Liu, Yuan
Wang, Liying
Jani, Hariom
Abdi, Fatwa F.
Wong, Lydia Helena
Keywords: Engineering::Materials
Issue Date: 2022
Source: Zhang, M., Fang, Y., Tay, Y. F., Liu, Y., Wang, L., Jani, H., Abdi, F. F. & Wong, L. H. (2022). Nanostructured iron vanadate photoanodes with enhanced visible absorption and charge separation. ACS Applied Energy Materials, 5(3), 3409-3416.
Project: MOE2016T21030
2020-T1-001-147 (RG64/20)
Journal: ACS Applied Energy Materials
Abstract: Nanostructuring has been an effective method to improve the charge separation of semiconductors with poor charge transport properties. FeVO4is a promising photoanode with a band gap of ∼2.1 eV, theoretical photocurrent of 13 mA cm-1, and solar-to-hydrogen efficiency of up to 16%. However, its photoelectrochemical (PEC) activity is limited by the low charge transport properties. In this report, a two-step synthesis method is found to control the growth of FeVO4photoanodes to become a nanorod or film. Nanostructured FeVO4is demonstrated to achieve higher photocurrent density due to the higher charge separation efficiency and enlarged absorption range. In addition, the band gap of FeVO4nanorods has decreased by 0.16 eV, which is attributed to the formation of vanadium vacancy, as supported by calculation results. This work demonstrates that nanostructuring and vacancy incorporation synergistically improve the PEC performance of FeVO4-based photoanodes.
ISSN: 2574-0962
DOI: 10.1021/acsaem.1c04004
Rights: © 2022 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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