Nanostructured iron vanadate photoanodes with enhanced visible absorption and charge separation

Nanostructured iron vanadate photoanodes with enhanced visible absorption and charge separation

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 photoe...

Full description

Saved in:
Bibliographic Details
Main Authors: Zhang, Mengyuan, Fang, Yanan, Tay, Ying Fan, Liu, Yuan, Wang, Liying, Jani, Hariom, Abdi, Fatwa F., Wong, Lydia Helena
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2022
Subjects:
Engineering::Materials
Iron Vanadate
Nanostructure
Online Access:https://hdl.handle.net/10356/162424
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
Description
Summary: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.

Similar Items