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High Throughput Discovery of Effective Metal Doping in FeVO 4 for Photoelectrochemical Water Splitting
Author(s) -
Nguyen Thi Hiep,
Zhang Mengyuan,
Septina Wilman,
Ahmed Mahmoud G.,
Tay Ying Fan,
Abdi Fatwa F.,
Wong Lydia Helena
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000437
Subject(s) - photocurrent , doping , materials science , dopant , tin oxide , water splitting , band gap , visible spectrum , optoelectronics , charge carrier , nanotechnology , catalysis , photocatalysis , chemistry , biochemistry
FeVO 4 is a potential photoanode candidate with favorable bandgap energy for absorbing visible light in the solar spectrum. However, the achieved photocurrents are still much lower than the theoretical photocurrent due to poor bulk carrier separation efficiency. Herein, the aim is to improve FeVO 4 charge transport properties by searching for suitable metal doping using combinatorial methods. Thin‐film FeVO 4 libraries with different doping ratios of Zn, Ni, Cr, Mo, and W are fabricated on fluorine doped tin oxide substrates using combinatorial inkjet printing and their photoelectrochemical properties screened using photoscanning droplet cell. Mo and W doping show higher current density compared with undoped FeVO 4 ; whereas the photocurrent decreases for Ni‐ and Zn‐doped samples. The best photocurrent is achieved with 7% doping ratio of Cr. Cr is discovered as a promising dopant for the first time, which is more effective than reported Mo or W for FeVO 4 photoanode. The replacement of Cr 3+ to Fe 3+ in FeVO 4 crystal lattice helps to mainly improve the catalytic activity for charge transfer, which results in the enhancement of photoresponse of the FeVO 4 photoanode.