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

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

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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 ∼110 mV while achieving a Faradaic efficiency of ∼99.5% under illumination and prolonging the catalytic lifetime by more than a factor of 20 at 2.0 V vs RHE under illumination.
Original languageEnglish
JournalACS Energy Letters
Volume4
Issue number3
Pages (from-to)720-728
Number of pages9
ISSN2380-8195
DOIs
Publication statusPublished - 2019
Externally publishedYes

Cite this

Baek, J. H., Gill, T. M., Abroshan, H., Park, S., Shi, X., Nørskov, J. K., Jung, H. S., Siahrostami, S., & Zheng, X. (2019). Selective and Efficient Gd-Doped BiVO4 Photoanode for Two-Electron Water Oxidation to H2O2. ACS Energy Letters, 4(3), 720-728. https://doi.org/10.1021/acsenergylett.9b00277