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Efficient BiVO4 Photoanodes by Postsynthetic Treatment: Remarkable Improvements in Photoelectrochemical Performance from Facile Borate Modification
KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Chem, S-10044 Stockholm, Sweden.
KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Chem, S-10044 Stockholm, Sweden.
KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Chem, S-10044 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0001-8519-3240
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(English)In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773Article in journal (Refereed) Epub ahead of print
Abstract [en]

Water-splitting photoanodes based on semiconductor materials typically require a dopant in the structure and co-catalysts on the surface to overcome the problems of charge recombination and high catalytic barrier. Unlike these conventional strategies, a simple treatment is reported that involves soaking a sample of pristine BiVO4 in a borate buffer solution. This modifies the catalytic local environment of BiVO4 by the introduction of a borate moiety at the molecular level. The self-anchored borate plays the role of a passivator in reducing the surface charge recombination as well as that of a ligand in modifying the catalytic site to facilitate faster water oxidation. The modified BiVO4 photoanode, without typical doping or catalyst modification, achieved a photocurrent density of 3.5 mA cm(-2) at 1.23 V and a cathodically shifted onset potential of 250 mV. This work provides an extremely simple method to improve the intrinsic photoelectrochemical performance of BiVO4 photoanodes.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH.
Keywords [en]
artificial photosynthesis, BiVO4, borate, photoelectrochemical cells, water oxidation
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-397791DOI: 10.1002/anie.201911303ISI: 000495089000001PubMedID: 31617301OAI: oai:DiVA.org:uu-397791DiVA, id: diva2:1373738
Funder
Swedish Research Council, 2017-00935Swedish Energy AgencyKnut and Alice Wallenberg Foundation, KAW 2016.0072EU, FP7, Seventh Framework Programme, 312284Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2019-11-28

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