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Enhancing Mo:BiVO 4 Solar Water Splitting with Patterned Au Nanospheres by Plasmon‐Induced Energy Transfer
Author(s) -
Kim Jung Kyu,
Shi Xinjian,
Jeong Myung Jin,
Park Joonsuk,
Han Hyun Soo,
Kim Suk Hyun,
Guo Yu,
Heinz Tony F.,
Fan Shanhui,
Lee ChangLyoul,
Park Jong Hyeok,
Zheng Xiaolin
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201701765
Subject(s) - materials science , photocurrent , plasmon , absorption (acoustics) , oxide , optoelectronics , nanotechnology , graphene , vanadium oxide , water splitting , metal , photocatalysis , chemistry , biochemistry , catalysis , metallurgy , composite material
Plasmonic metal nanostructures have been extensively investigated to improve the performance of metal oxide photoanodes for photoelectrochemical (PEC) solar water splitting cells. Most of these studies have focused on the effects of those metal nanostructures on enhancing light absorption and enabling direct energy transfer via hot electrons. However, several recent studies have shown that plasmonic metal nanostructures can improve the PEC performance of metal oxide photoanodes via another mechanism known as plasmon‐induced resonant energy transfer (PIRET). However, this PIRET effect has not yet been tested for the molybdenum‐doped bismuth vanadium oxide (Mo:BiVO 4 ), regarded as one of the best metal oxide photoanode candidates. Here, this study constructs a hybrid Au nanosphere/Mo:BiVO 4 photoanode interwoven in a hexagonal pattern to investigate the PIRET effect on the PEC performance of Mo:BiVO 4 . This study finds that the Au nanosphere array not only increases light absorption of the photoanode as expected, but also improves both its charge transport and charge transfer efficiencies via PIRET, as confirmed by time‐correlated single photon counting and transient absorption studies. As a result, incorporating the Au nanosphere array increases the photocurrent density of Mo:BiVO 4 at 1.23 V versus RHE by ≈2.2‐fold (2.83 mA cm −2 ).