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Fabrication and Kinetic Study of a Ferrihydrite-Modified BiVO4 Photoanode
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2017 (English)In: ACS Catalysis, ISSN 2155-5435, E-ISSN 2155-5435, Vol. 7, no 3, 1868-1874 p.Article in journal (Refereed) Published
Abstract [en]

In spite of great progress in the surface modification of semiconductor photoelectrodes, the role of the metal oxide cocatalyst on photoelectrochemical (PEC) performance is still not well understood. In this study, ferrihydrite (Fh) as a novel cocatalyst was decorated on a wormlike nanoporous BiVO4 photoanode. A surface kinetics study of Fh/BiVO4 by intensity-modulated photocurrent spectroscopy (IMPS) evidences the primary role of Fh on PEC performance enhancement, varying with the loading of Fh. It was found that dispersed Fh nanoparticles accelerate hole transfer for water oxidation, but the resulting photoanode suffers from poor stability. The thick layers of Fh address the stability of the electrode by suppressing surface charge recombination but result in reduced hole transfer rates. Modification of a BiVO4 film with optimally thick layers of discrete nanoflakes effectively reduces charge recombination without compromising stability, leading to a high AM 1.5 G photocurrent of 4.78 mA/cm2 at 1.23 V versus the reversible hydrogen electrode and an applied bias photon to current efficiency of 1.81% at 0.61 V. These values are comparable to the best results reported for undoped BiVO4. (Chemical Equation Presented).

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 7, no 3, 1868-1874 p.
Keyword [en]
bismuth vanadate, ferrihydrite, passivation, photoanode, water splitting, Electrodes, Metals, Surface treatment, Bismuth vanadates, Ferrihydrites, Intensity modulated photocurrent spectroscopy (IMPS), Performance enhancements, Photo-anodes, Photon-to-current efficiencies, Reversible hydrogen electrodes, Photoelectrochemical cells
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-208043DOI: 10.1021/acscatal.6b03483ISI: 000395726500045ScopusID: 2-s2.0-85015156712OAI: oai:DiVA.org:kth-208043DiVA: diva2:1104387
Funder
Knut and Alice Wallenberg Foundation, 21476043Swedish Energy Agency
Note

QC 20170601

Available from: 2017-06-01 Created: 2017-06-01 Last updated: 2017-06-27Bibliographically approved

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Sun, Licheng
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Centre of Molecular Devices, CMDOrganic ChemistryZhejiang-KTH Joint Research Center of Photonics, JORCEP
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