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Nano energy v.31, 2017년, pp.441 - 449   SCIE
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Heavy metal-free, near-infrared colloidal quantum dots for efficient photoelectrochemical hydrogen generation

Tong, Xin (Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China ); Zhou, Yufeng (Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650 Boul. Lionel Boulet, J3X 1S2 Varennes, Québec, Canada ); Jin, Lei (Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650 Boul. Lionel Boulet, J3X 1S2 Varennes, Québec, Canada ); Basu, Kaustubh (Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650 Boul. Lionel Boulet, J3X 1S2 Varennes, Québec, Canada ); Adhikari, Rajesh (Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650 Boul. Lionel Boulet, J3X 1S2 Varennes, Québec, Canada ); Selopal, Gurpreet Singh (Institute of Fundamental and Frontier Sciences, University of Electronic Scie ); Tong, Xin ( ); Zhao, Haiguang ( ); Sun, Shuhui ( ); Vomiero, Alberto ( ); Wang, Zhiming M. ( ); Rosei, Federico ( );
  • 초록  

    Abstract Photoelectrochemical (PEC) hydrogen generation based on colloidal quantum dots (QDs) is very promising because of its high solar energy to fuel conversion efficiency and low fabrication costs. However, its commercial development is hindered by various challenges, including the widespread use of toxic heavy metal–based QDs as sensitizers. We report an environmentally friendly, high efficiency PEC device in which the photoanode consists of a mesoporous TiO 2 film sensitized with heavy metal-free, near-infrared (NIR) colloidal CuInSe x S 2−x (CISeS) QDs. To reduce surface-related traps, we grew an ultrathin ZnS shell on the CISeS core QDs by cation exchange. The PEC cell based on this core/shell CISeS/ZnS QDs exhibits suppressed charge recombination and a saturated photocurrent density of ~5.3mA/cm 2 under one sun illumination (AM 1.5G, 100mW/cm 2 ). In addition, the as-prepared PEC device shows an outstanding stability, exhibiting a drop of only 23% after 9h illumination. The success in using such core/shell CISeS/ZnS QDs paves the way to realize environment-friendly, high efficiency and cost-effective PEC devices for hydrogen production. Highlights NIR, colloidal core/shell CISeS/ZnS QDs are used for PEC hydrogen generation. Fully green PEC system is achieved by core/shell CISeS/ZnS QDs. Unprecedented photocurrent density (~5.3mA/cm 2 ) is obtained. Core/shell CISeS/ZnS QDs-based PEC device shows high stability. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Environment-friendly .   High efficiency .   Photoelectrochemical cell .   Near infrared .   Quantum dots.  

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