期刊
ACS ENERGY LETTERS
卷 4, 期 7, 页码 1755-1762出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00964
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资金
- ERDF funds through the Portuguese Operational Programme for Competitiveness and Internationalization COMPETE 2020
- national funds through FCT - The Portuguese Foundation for Science and Technology [PTDC/CTM-ENE/2349/2014, 016660]
- Portugal China Bilateral Collaborative Programme [FCT/21102/28/12/2016/S]
- Ministry of Science and Technology of China [2016YFE0132400]
- National Science Foundation of China [51728202]
- [IF/01595/2014]
- [IF/01595/2014/CP1247/CT0001]
- Fundação para a Ciência e a Tecnologia [PTDC/CTM-ENE/2349/2014, IF/01595/2014/CP1247/CT0001] Funding Source: FCT
Silicon (Si) has been investigated as a promising photoelectrode material for use in photoelectrochemical water splitting. However, development of Si photocathodes that can operate at a high photocurrent density for solar-driven hydrogen production with long-term stability remains challenging. Herein, we report the fabrication of inverted pyramid textured p-Si photocathodes covered conformally and continuously with a thickness-gradient cobalt phosphide (Co2P) layer, which not only effectively isolates p-Si from aqueous electrolyte to avoid corrosion but also efficiently catalyzes the solar-driven hydrogen evolution reaction (HER). Thanks to the unique inverted pyramid structure, the drop-cast Co2P can distribute all over the p-Si photocathode and form a macroscopically continuous but locally nonuniform layer on the sidewalls of each inverted pyramid. The local nonuniform distribution enables light absorption to be partially separated from catalytic activity. Consequently, the as-fabricated Co2P-coated p-Si photocathode exhibits a high photocurrent density of 35.2 mA cm(-2) at 0 V versus the reversible hydrogen electrode under AM 1.5G illumination and can photoelectrochemically catalyze the HER above 30 mA cm(-2) at least 150 h without notable degradation.
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