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Selective and Efficient Gd-Doped BiVO4 Photoanode for Two-Electron Water Oxidation to H2O2

Cited 147 time in Web of Science Cited 158 time in Scopus
Authors

Baek, Ji Hyun; Gill, Thomas Mark; Abroshan, Hadi; Park, Sangwook; Shi, Xinjian; Norskoy, Jens; Jung, Hyun Suk; Siahrostami, Samira; Zheng, Xiaolin

Issue Date
2019-03
Publisher
American Chemical Society
Citation
ACS Energy Letters, Vol.4 No.3, pp.720-728
Abstract
Photoelectrochemical oxidation of water presents a pathway for sustainable production of hydrogen peroxide (H2O2). Two-electron water oxidation toward H2O2, however, competes with the popular four-electron process to form oxygen and one-electron water oxidation to form OH radical. To date, bismuth vanadate (BiVO4) has been shown to exhibit promising selectivity toward H2O2, especially under illumination, but it suffers from high overpotential and notoriously poor stability. Herein, using density functional theory calculations, we predict that doping BiVO4 with optimal concentrations of gadolinium (Gd) not only enhances its activity for H2O2 production but also improves its stability. Experimentally, we demonstrate that intermediate amounts of Gd doping (6-12%) reduce the onset potential of BiVO4 for H2O2 production by similar to 110 mV while achieving a Faradaic efficiency of similar to 99.5% under illumination and prolonging the catalytic lifetime by more than a factor of 20 at 2.0 V vs RHE under illumination.
ISSN
2380-8195
URI
https://hdl.handle.net/10371/202172
DOI
https://doi.org/10.1021/acsenergylett.9b00277
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  • College of Engineering
  • Department of Mechanical Engineering
Research Area Clean Hydrogen Production and Storage, Greenhouse Gas Reduction and Carbon Utilization, Water & Air Purification, 오염수 및 대기 정화 기술, 온실 기체 절감 및 탄소 자원화, 친환경 수소 생산 및 저장

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