Tungsten carbide nanoparticles as efficient cocatalysts for photocatalytic overall water splitting

Handle URI:
http://hdl.handle.net/10754/562459
Title:
Tungsten carbide nanoparticles as efficient cocatalysts for photocatalytic overall water splitting
Authors:
Garcia Esparza, Angel T. ( 0000-0002-4884-171X ) ; Cha, Dong Kyu; Ou, Yiwei; Kubota, Jun; Domen, Kazunari; Takanabe, Kazuhiro ( 0000-0001-5374-9451 )
Abstract:
Tungsten carbide exhibits platinum-like behavior, which makes it an interesting potential substitute for noble metals in catalytic applications. Tungsten carbide nanocrystals (≈5 nm) are directly synthesized through the reaction of tungsten precursors with mesoporous graphitic C3N 4 (mpg-C3N4) as the reactive template in a flow of inert gas at high temperatures. Systematic experiments that vary the precursor compositions and temperatures used in the synthesis selectively generate different compositions and structures for the final nanocarbide (W 2C or WC) products. Electrochemical measurements demonstrate that the WC phase with a high surface area exhibits both high activity and stability in hydrogen evolution over a wide pH range. The WC sample also shows excellent hydrogen oxidation activity, whereas its activity in oxygen reduction is poor. These tungsten carbides are successful cocatalysts for overall water splitting and give H2 and O2 in a stoichiometric ratio from H 2O decomposition when supported on a Na-doped SrTiO3 photocatalyst. Herein, we present tungsten carbide (on a small scale) as a promising and durable catalyst substitute for platinum and other scarce noble-metal catalysts in catalytic reaction systems used for renewable energy generation. Platinum replacement: The phase-controlled synthesis of tungsten carbide nanoparticles from the nanoconfinement of a mesoporous graphite C 3N4 (mpg-C3N4) reactive template is shown. The nanomaterials catalyze hydrogen evolution/oxidation reactions, but are inactive in the oxygen reduction reaction. Tungsten carbide is an effective cocatalyst for photocatalytic overall water splitting (see picture). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division; Advanced Nanofabrication, Imaging and Characterization Core Lab; Chemical Science Program; Core Labs; Catalysis for Energy Conversion (CatEC)
Publisher:
Wiley-Blackwell
Journal:
ChemSusChem
Issue Date:
17-Dec-2012
DOI:
10.1002/cssc.201200780
PubMed ID:
23255471
Type:
Article
ISSN:
18645631
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorGarcia Esparza, Angel T.en
dc.contributor.authorCha, Dong Kyuen
dc.contributor.authorOu, Yiweien
dc.contributor.authorKubota, Junen
dc.contributor.authorDomen, Kazunarien
dc.contributor.authorTakanabe, Kazuhiroen
dc.date.accessioned2015-08-03T10:38:57Zen
dc.date.available2015-08-03T10:38:57Zen
dc.date.issued2012-12-17en
dc.identifier.issn18645631en
dc.identifier.pmid23255471en
dc.identifier.doi10.1002/cssc.201200780en
dc.identifier.urihttp://hdl.handle.net/10754/562459en
dc.description.abstractTungsten carbide exhibits platinum-like behavior, which makes it an interesting potential substitute for noble metals in catalytic applications. Tungsten carbide nanocrystals (≈5 nm) are directly synthesized through the reaction of tungsten precursors with mesoporous graphitic C3N 4 (mpg-C3N4) as the reactive template in a flow of inert gas at high temperatures. Systematic experiments that vary the precursor compositions and temperatures used in the synthesis selectively generate different compositions and structures for the final nanocarbide (W 2C or WC) products. Electrochemical measurements demonstrate that the WC phase with a high surface area exhibits both high activity and stability in hydrogen evolution over a wide pH range. The WC sample also shows excellent hydrogen oxidation activity, whereas its activity in oxygen reduction is poor. These tungsten carbides are successful cocatalysts for overall water splitting and give H2 and O2 in a stoichiometric ratio from H 2O decomposition when supported on a Na-doped SrTiO3 photocatalyst. Herein, we present tungsten carbide (on a small scale) as a promising and durable catalyst substitute for platinum and other scarce noble-metal catalysts in catalytic reaction systems used for renewable energy generation. Platinum replacement: The phase-controlled synthesis of tungsten carbide nanoparticles from the nanoconfinement of a mesoporous graphite C 3N4 (mpg-C3N4) reactive template is shown. The nanomaterials catalyze hydrogen evolution/oxidation reactions, but are inactive in the oxygen reduction reaction. Tungsten carbide is an effective cocatalyst for photocatalytic overall water splitting (see picture). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en
dc.publisherWiley-Blackwellen
dc.subjectcarbon nitrideen
dc.subjecthydrogen evolution reactionen
dc.subjectnanoparticlesen
dc.subjecttungsten carbideen
dc.subjectwater splittingen
dc.titleTungsten carbide nanoparticles as efficient cocatalysts for photocatalytic overall water splittingen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentCore Labsen
dc.contributor.departmentCatalysis for Energy Conversion (CatEC)en
dc.identifier.journalChemSusChemen
dc.contributor.institutionDepartment of Chemical System Engineering, Graduate School of Engineering, University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japanen
kaust.authorCha, Dong Kyuen
kaust.authorTakanabe, Kazuhiroen
kaust.authorGarcia Esparza, Angel T.en

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