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Please use this identifier to cite or link to this item: http://elib.bsu.by/handle/123456789/232327
Title: Bismuth oxysulfide photoelectrodes with giant incident photon-to-current conversion efficiency: chemical stability in aqueous solutions
Authors: Bondarenko, E. A.
Streltsov, Е. А.
Mazanik, A. V.
Kulak, A. I.
Keywords: ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика
Issue Date: 2-May-2019
Publisher: John Wiley and Sons Ltd
Citation: ChemElectroChem. – 2019. – Vol. 6. – P. 2474–2481
Abstract: Bismuth oxysulfide (BOS) films demonstrate giant incident photon-to-current conversion efficiency (IPCE >> 100%) under cathodic polarization. Their photoelectrochemical behavior and corrosion stability in aqueous solutions containing different redox systems ([Fe(CN)6]3–/[Fe(CN)6]4–, Fe3+/Fe2+, I2/I–, Sn2–/S2–) has been investigated. We established that the chemical stability of the BOS is controlled mainly by three factors: (i) potentials of cathodic and anodic destruction of the BOS (Bi3+ reduction and S2– oxidation), (ii) protolytic reactions leading to the dissolution of the semiconductor in acidic solutions at рН < 3, (iii) presence in solutions of anions, capable to participate in ion exchange reactions with the semiconductor forming poorly soluble compounds (K[BiFe(CN)6]·3H2O, BiOI and Bi2S3). The enrichment of the BOS surface with sulfur atoms (formation of S-terminated surface) gives rise to the substantial increase in the electrocatalytic activity of [Fe(CN)6]3– cathodic reduction, which is accompanied by up to order increase of IPCE.
URI: http://elib.bsu.by/handle/123456789/232327
Appears in Collections:Кафедра энергофизики

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