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Title: Enhancing the Photoactivity of Faceted BiVO4 via Annealing in Oxygen-Deficient Condition

Journal Article · · Particle & Particle Systems Characterization

Thermal annealing of metal oxides in oxygen‐deficient atmosphere, particularly reducing hydrogen gas, has been demonstrated to induce oxygen vacancy formation for enhanced photoactivity of the materials. Here, it is demonstrated that argon annealing (another prevalently used oxygen‐deficient gas) in the temperature range of 300–700 °C greatly affects the activity of dual‐faceted BiVO 4 microcrystals for photocatalytic O 2 generation and photocurrent generation. While treatment at 300 °C has little to no effect, higher temperatures of 500 and 700 °C significantly improve the crystallinity, alter the local structure distortion, and reduce the bandgap energy of the treated BiVO 4 . The higher temperature treatment also favors formation of new subgap states attributed to oxygen vacancies, as supported by surface photovoltage and electron paramagnetic resonance spectroscopies. Despite the most profound improvements in structural, optical, and electronic properties displayed by the 700 °C‐treated BiVO 4 , the sample annealed at 500 °C exhibits the highest photoactivity. The lower activity of the 700 °C‐treated BiVO 4 is ascribed to the creation of bismuth vacancies and the loss of well‐defined crystal facets, contributing to impeded electron transport and poor charge separation.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001234
OSTI ID:
1533215
Alternate ID(s):
OSTI ID: 1400598
Journal Information:
Particle & Particle Systems Characterization, Vol. 34, Issue 4; ISSN 0934-0866
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Investigating the Role of Oxygen Vacancies and Lattice Strain Defects on the Enhanced Photoelectrochemical Property of Alkali Metal (Li, Na, and K) Doped ZnO Nanorod Photoanodes journal February 2018
The Dependence of Bi 2 MoO 6 Photocatalytic Water Oxidation Capability on Crystal Facet Engineering journal August 2019
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Target stoichiometry and growth temperature impact on properties of BiVO 4 (010) epitaxial thin films journal January 2018
Simultaneous reduction of surface, bulk, and interface recombination for Au nanoparticle-embedded hematite nanorod photoanodes toward efficient water splitting journal January 2019
Ultrafine Au nanoparticles anchored on Bi 2 MoO 6 with abundant surface oxygen vacancies for efficient oxygen molecule activation journal January 2019