Journal
CHEMSUSCHEM
Volume 14, Issue 18, Pages 3967-3974Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202101347
Keywords
copper sulfide; molecular inks; solution processing; photoelectrochemical; water splitting
Funding
- University of Zurich
- University Research Priority Program (URPP) LightChEC
- Swiss National Science Foundation [184737, 160586]
- postdoctoral Forschungskredit of the University of Zurich [FK-19-117]
- China Scholarship Council (CSC)
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A cost-effective method was developed to prepare phase-pure crystalline Cu2S thin films, which showed excellent photoelectrochemical performance when coupled with CdS buffer layer, TiO2 protective layer, and RuOx catalyst, demonstrating high stability and promising potential for solar-driven hydrogen fuel production.
Cu2S is a promising solar energy conversion material owing to its good optical properties, elemental earth abundance, and low cost. However, simple and cheap methods to prepare phase-pure and photo-active Cu2S thin films are lacking. This study concerns the development of a cost-effective and high-throughput method that consists of dissolving high-purity commercial Cu2S powder in a thiol-amine solvent mixture followed by spin coating and low-temperature annealing to obtain phase-pure crystalline low chalcocite Cu2S thin films. After coupling with a CdS buffer layer, a TiO2 protective layer and a RuOx hydrogen evolution catalyst, the champion Cu2S photocathode gives a photocurrent density of 2.5 mA cm(-2) at -0.3 V vs. reversible hydrogen electrode (V-RHE), an onset potential of 0.42 V-RHE, and high stability over 12 h in pH 7 buffer solution under AM1.5 G simulated sunlight illumination (100 mW cm(-2)). This is the first thiol-amine-based ink deposition strategy to prepare phase-pure Cu2S thin films achieving decent photoelectrochemical performance, which will facilitate its future scalable application for solar-driven hydrogen fuel production.
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