期刊
NANO ENERGY
卷 27, 期 -, 页码 265-274出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.07.010
关键词
Water-splitting; Giant; Core@shell quantum dots; Hydrogen generation
类别
资金
- NSERC
- Canada Foundation for Innovation
- Fonds du Quebec en Recherche sur la Nature et la Technologie
- Kempe Foundation
- LTU Labfund program
- EWR Steacie Memorial Fellowship (NSERC)
- Canada Research Chairs program
Quantum dot (QD) sensitized TiO2 is considered as a highly promising photoanode material for photo electrochemical (PEC) solar hydrogen production. However, due to its limited stability, the photoanode suffers from degradation of its long-term PEC performance. Here, we report the design and characterization of a high-efficiency and long-term stable Pt-free PEC cell. The photoanode is composed of a mesoporous TiO2 nanoparticle film sensitized with giant core@shell QDs for PEC solar hydrogen generation. The thick shell enhances light absorption in the visible range, increases the stability of the QDs and does not inhibit charge separation, injection and transport, needed for proper operation of the device. We prepared thin films of Cu2S nanoflakes through a simple and reproducible procedure, and used them as counter-electrodes replacing the standard Pt film, resulting in equivalent performances of the PEC cell. We obtained an unprecedented photocurrent density (similar to 10 mA/cm(2)) for giant QDs based PEC devices (and corresponding H-2 generation) and a very promising stability, indicating that the proposed cell architecture is a good candidate for long-term stable QD-based PEC solar hydrogen generation. (C) 2016 Elsevier Ltd. All rights reserved.
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