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Heavy Metal-free, Near-infrared Colloidal Quantum Dots for Efficient Photoelectrochemical Hydrogen Generation
Institut National de la Recherche Scientifique, 1650 Boulevard Lionel-Boulet, Varennes, Québec .
INRS-EMT, Varennes, QC.
Institut National de la Recherche Scientifique, 1650 Boulevard Lionel-Boulet, Varennes, Québec .
Centre for Energy, Materials and Telecommunications, Institut National de la Recherche Scientifique.
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Number of Authors: 11
2017 (English)In: Nano Energy, ISSN 2211-2855, Vol. 31, 441-449 p.Article in journal (Refereed) Published
Abstract [en]

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 TiO2 film sensitized with heavy metal-free, near-infrared (NIR) colloidal CuInSexS2-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 ~5.3 mA/cm2 under one sun illumination (AM 1.5 G, 100 mW/cm2). In addition, the as-prepared PEC device shows an outstanding stability, exhibiting a drop of only 23% after 9 h 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. 

Place, publisher, year, edition, pages
2017. Vol. 31, 441-449 p.
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Other Physics Topics
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Experimental physics
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URN: urn:nbn:se:ltu:diva-60708DOI: 10.1016/j.nanoen.2016.11.053ISI: 000393446500050ScopusID: 2-s2.0-85001103525OAI: oai:DiVA.org:ltu-60708DiVA: diva2:1050001
Note

Validerad; 2017; Nivå 2; 2016-12-20 (andbra)

Available from: 2016-11-28 Created: 2016-11-28 Last updated: 2017-05-17Bibliographically approved

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CiteExportLink to record
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