Please use this identifier to cite or link to this item:
|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|
|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.|
|Appears in Collections:||Кафедра энергофизики|
Files in This Item:
|Manuscript for BSU library.pdf||2,29 MB||Adobe PDF||View/Open|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.