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• W2899572550 endingPage "414" @default.
• W2899572550 startingPage "404" @default.
• W2899572550 abstract "Solar-driven photoelectrochemical (PEC) hydrogen (H2) generation is a promising approach to harvest solar energy for the production of a clean chemical fuel. However, the low photon-to-fuel conversion efficiency and long-term stability of PEC devices are major challenges to be addressed to enable large-scale commercialization. Here we report a simple, fast and cost-effective approach to fabricate high efficiency and stable PEC devices for H2 generation, by fabricating a hybrid photoanode obtained by incorporating small amounts of multiwall carbon nanotubes (MWCNTs) into a TiO2 mesoporous film and sensitizing with colloidal heterostructured CdSe/(CdSexS1-x)5/(CdS)2 quantum dots (QDs). The latter were specially designed to accelerate the exciton separation through a band engineering approach. The PEC devices based on the TiO2/QD-MWCNT (T/Q-M) hybrid photoanode with an optimized amount of MWCNTs (0.015 wt%) yield a saturated photocurrent density of 15.90 mA cm-2 (at 1.0 VRHE) under one sun illumination (AM 1.5G, 100 mW cm-2), which is 40% higher than that of the reference device based on TiO2/QD (T/Q) photoanodes. This is attributed to a synergistic effect of the promising optoelectronic properties of the colloidal heterostructured QDs and improved electron transport (reduced charge transfer resistance) within the TiO2-MWCNT hybrid anodes enabled by the directional path of MWCNTs for the photo-injected electrons towards FTO. Furthermore, the PEC device based on the T/Q-M hybrid photoanode is more stable (∼19% loss of its initial photocurrent density) when compared with the T/Q photoanode (∼35% loss) after two hours of continuous one sun illumination. Our results provide fundamental insights and a different approach to improve the efficiency and long-term stability of PEC devices and represent an essential step towards the commercialization of this emerging solar-to-fuel conversion technology." @default.
• W2899572550 created "2018-11-16" @default.
• W2899572550 creator A5010945769 @default.
• W2899572550 creator A5019953202 @default.
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• W2899572550 creator A5049694267 @default.
• W2899572550 creator A5056284737 @default.
• W2899572550 creator A5090531383 @default.
• W2899572550 date "2019-01-01" @default.
• W2899572550 modified "2023-10-18" @default.
• W2899572550 title "A colloidal heterostructured quantum dot sensitized carbon nanotube–TiO₂ hybrid photoanode for high efficiency hydrogen generation" @default.
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• W2899572550 doi "https://doi.org/10.1039/c8nh00227d" @default.
• W2899572550 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32254093" @default.
• W2899572550 hasPublicationYear "2019" @default.
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