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https://hdl.handle.net/1822/57699
Título: | Conformal and continuous deposition of bifunctional cobalt phosphide layers on p-silicon nanowire arrays for improved solar hydrogen evolution |
Autor(es): | Thalluri, Sitaramanjaneva Mouli Borme, Jerome Yu, Kang Xu, Junyuan Amorim, Isilda Gaspar, João Qiao, Liang Ferreira, Paulo Alpuim, P. Liu, Lifeng |
Palavras-chave: | solar-driven hydrogen evolution silicon nanowire cobalt phosphide photoelectrochemical water splitting drop-casting |
Data: | Set-2018 |
Editora: | Springer |
Revista: | Nano Research |
Resumo(s): | Vertically aligned p-silicon nanowire (SiNW) arrays have been extensively investigated in recent years as promising photocathodes for solar-driven hydrogen evolution. However, the fabrication of SiNW photocathodes with both high photoelectrocatalytic activity and long-term operational stability using a simple and affordable approach is a challenging task. Herein, we report conformal and continuous deposition of a di-cobalt phosphide (Co2P) layer on lithography-patterned highly ordered SiNW arrays via a cost-effective drop-casting method followed by a low-temperature phosphorization treatment. The as-deposited Co2P layer consists of crystalline nanoparticles and has an intimate contact with SiNWs, forming a well-defined SiNW@Co2P core/shell nanostructure. The conformal and continuous Co2P layer functions as a highly efficient catalyst capable of substantially improving the photoelectrocatalytic activity for the hydrogen evolution reaction (HER) and effectively passivates the SiNWs to protect them from photo-oxidation, thus prolonging the lifetime of the electrode. As a consequence, the SiNW@Co2P photocathode with an optimized Co2P layer thickness exhibits a high photocurrent density of -21.9 mA.cm(-2) at 0 V versus reversible hydrogen electrode and excellent operational stability up to 20 h for solar-driven hydrogen evolution, outperforming many nanostructured silicon photocathodes reported in the literature. The combination of passivation and catalytic functions in a single continuous layer represents a promising strategy for designing high-performance semiconductor photoelectrodes for use in solar-driven water splitting, which may simplify fabrication procedures and potentially reduce production costs |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/57699 |
DOI: | 10.1007/s12274-018-2070-4 |
ISSN: | 1998-0124 |
Versão da editora: | https://link.springer.com/ |
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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Manuscript_V6.pdf | 1,36 MB | Adobe PDF | Ver/Abrir |