Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/49828
Título: | Amorphous oxygen-rich molybdenum oxysulfide Decorated p-type silicon microwire Arrays for efficient photoelectrochemical water reduction |
Autor(es): | Xiao-Qing Bao Petrovykh, D. Y. Alpuim, P. Stroppa, Daniel G. Guldris, Noelia Fonseca, Helder Costa, Margaret Gaspar, Joao Chuanhong Jin Lifeng Liu |
Palavras-chave: | Silicon microwire Photocathode Water reduction Molybdenum oxysulfide Hydrogen evolution reaction Silicon nanostructure Photoelectrochemical water splitting Electrocatalysis |
Data: | 30-Jun-2015 |
Editora: | Elsevier |
Revista: | Nano Energy |
Citação: | Nano Energy (2015) 16, 130–142 |
Resumo(s): | We report the fabrication of p-type silicon (Si) photocathodes consisting of well-ordered Si microwire (Si-MW) arrays coupled with non-precious and earth-abundant amorphous oxygen-rich molybdenum oxysulfide (MoOxSy) as both a hydrogen evolution catalyst and a passivation layer. The MoOxSyis conformally grown on the Si-MW surface through photo-assisted cyclic voltammetric (CV) deposition. By adjusting the cycle numbers of the CV deposition, Si-MW array electrodes with different MoOxSy catalyst loadings (Si-MWs@MoOxSy) have been obtained and comprehensively characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X- ray photoelectron spectroscopy (XPS), and Raman and Fourier-transform infrared spectroscopies. The photoelectrochemical performance of the Si-MWs@MoOxSycathodes toward water reduction is investigated and compared with that of platinum nanoparticle decorated Si-MW array electrodes (Si-MWs@PtNPs). An optimized Si-MWs@MoOxSyphotocathode is found to exhibit activity compar- able to that of the Si-MWs@PtNPs one, with a much better stability in acidic medium. In neutral electrolyte, Si-MWs@MoOxSyoutperforms Si-MWs@PtNPs in terms of both activity and stability. Given the low materials cost, easy and well-established electrode fabrication procedure, and high demonstrated photoelectrochemical performance, the Si-MWs@MoOxSyarrays reported here hold substantial promise for use as low-cost and efficient photocathodes for water reduction. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/49828 |
DOI: | 10.1016/j.nanoen.2015.06.014 |
ISSN: | 2211-2855 |
e-ISSN: | 2211-2855 |
Versão da editora: | https://www.sciencedirect.com/science/article/pii/S2211285515002682 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - CEP - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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SiMWMoOxSy_revised.pdf | 1,46 MB | Adobe PDF | Ver/Abrir | |
Supporting Information_revised.pdf | 2,35 MB | Adobe PDF | Ver/Abrir |