Journal
NANO ENERGY
Volume 88, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106220
Keywords
Quantum dots; Eco-friendly; Photoelectrochemical cell; Hydrogen generation; Carrier dynamics
Categories
Funding
- National Natural Science Foundation of China [52025061, 51776165]
- Royal SocietyNewton Advanced Fellowship [NAF\R1\191163]
- China Scholarship Council (CSC) [201706460021, 201706280247]
- China Postdoctoral Science Foundation [2020M683472]
- Natural Science Foundation of Shaanxi Province [2021JQ-040]
- Quebec Research Fund -Nature and Technologies (FRQNT)
- UNESCO Chair in MATECSS for a PDF Excellence Scholarship
- University of Electronic Science and Technology of China
- Natural Science and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI) for infrastructure and its operating funds
- Canada Research Chairs Program
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This study demonstrates the efficient hydrogen production by utilizing eco-friendly Cu-doped Zn-In-Se colloidal quantum dots in PEC cells, achieving unprecedented saturated photocurrent density under sunlight illumination. The optimized Cu dopant and Zn:In ratio significantly enhance light absorption, carrier injection rates/lifetime and the spatial separation of electron-hole pairs, showing promise for high efficiency and environmentally friendly solar-driven applications.
Photoelectrochemical (PEC) cells using colloidal quantum dots (QDs) as sensitizers are promising for efficient hydrogen (H-2) production, due to their low cost and to the size/shape/composition dependent optoelectronic properties of QDs. However, QDs that are typically used in PEC cell fabrication contain highly toxic heavy metals (e.g. Pb and Cd) cations, that limit commercial-scale applications. Herein, we synthesized eco-friendly Cu doped Zn-In-Se colloidal QDs and used them in PEC cells to efficiently produce H-2 from water. PEC cells fabricated with optimized Cu (5%) doped Zn-In-Se (Zn:In=1:4) QDs/TiO2 photoanodes yield an unprecedented saturated photocurrent density of 11.23 mA cm(-2) at 0.8 V vs. RHE under one sun illumination (AM 1.5, 100 mW.cm(-2)) and maintain similar to 60% of the initial photocurrent density value after 6000 s continuous illumination by using Na2S/Na2SO3 as hole scavenger. This new record value of photocurrent density from eco-friendly QDs based PEC cell demonstrates that an optimized amount of Cu dopant and Zn:In ratio significantly improves light absorption, carrier injection rates/lifetime and the spatial separation of electron-hole pairs. Our work indicates that Cu doped Zn-In-Se QDs can be used as efficient light harvesters to realize high efficiency, inexpensive and environmentally friendly solar-driven production of chemical fuels and other optoelectronic devices.
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