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Title: Enhancing Mo:BiVO 4 Solar Water Splitting with Patterned Au Nanospheres by Plasmon-Induced Energy Transfer [Rational Nanopositioning for BiVO 4 Solar Water Splitting by Plasmon-induced Energy Transfer]

Here, 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).
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [3] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [4] ; ORCiD logo [3] ; ORCiD logo [2]
  1. Stanford Univ., Stanford, CA (United States); Yonsei Univ., Seoul (Republic of Korea)
  2. Stanford Univ., Stanford, CA (United States)
  3. Yonsei Univ., Seoul (Republic of Korea)
  4. Gwangju Institute of Science and Technology, Gwangju (Republic of Korea)
Publication Date:
Grant/Contract Number:
2015-22-0067; NRF-2016R1A2A1A05005216; 2015M1A2A2074663; 2016M3D3A1A01913254; FA9550-14-1-0040; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; gold nanospheres; pattern arrays; photoelectrochemical water splitting; plasmonic coupling; plasmon-induced energy transfer
OSTI Identifier:
1457389
Alternate Identifier(s):
OSTI ID: 1396419