Titanate quantum dots-sensitized Cu2S nanocomposites for superficial H2 production via photocatalytic water splitting |
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Affiliation: | 1. Department of Global Nanotechnology Development Team, National Nanofab Center at Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea;2. Electro-chemical Power Sources Division, Central Electrochemical Research Institute (CSIR-CECRI), Karaikudi 630003, Tamil Nadu, India;3. Centre for Nano and Material Sciences, Jain University, Bangalore 562112, Karnataka, India;4. School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi-si, Gyeongbuk 39177, Republic of Korea;5. Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa 516005, Andhra Pradesh, India |
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Abstract: | TiO2 quantum dots-sensitized Cu2S (Cu2S/TiO2) nanocomposites with varying concentration of TiO2 QDs are synthesized via a facile two-stage hydrothermal-wet impregnation method. X-ray diffraction analysis confirms the formation of Cu2S and TiO2with chalcocite and anatase phases, respectively. The observed shoulder-like absorption peaks indicate the UV–visible light-driven properties of the composite. Morphological analysis reveals that the fabricated Cu2S/TiO2 composite consists of Cu2S with a nano rod-like shape (average length and width of ~856 and ~213 nm, respectively) and nanosheets-like structures (average length and width of ~283 and ~289 nm, respectively), whereas the TiO2 is formed as quantum dots with a size range of 8.2 ± 0.4 nm. Chemical state analysis shows the presence of Cu+, S2?, Ni2+, and O2? in the nanocomposite. The H2 evolution rate over the optimized photocatalyst is found to be ~45.6 mmol h?1g?1cat under simulated solar irradiation, which is around 5 and 2.4-fold higher than that of the pristine TiO2 and Cu2S, respectively. Continuous H2 production for 30 h is achieved during time-on-stream experiments, demonstrating the excellent stability and durability of the Cu2S/TiO2 photocatalyst for large-scale applications. |
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Keywords: | Titanium dioxide Quantum dots Copper sulfide Nanocomposite Photocatalyst Water splitting QDs"} {"#name":"keyword" "$":{"id":"kwrd0050"} "$$":[{"#name":"text" "_":"quantum dots XRD"} {"#name":"keyword" "$":{"id":"kwrd0060"} "$$":[{"#name":"text" "_":"X-ray diffraction XPS"} {"#name":"keyword" "$":{"id":"kwrd0070"} "$$":[{"#name":"text" "_":"X-ray photoelectron spectroscopy EDX"} {"#name":"keyword" "$":{"id":"kwrd0080"} "$$":[{"#name":"text" "_":"energy-dispersive X-ray spectroscopy BE"} {"#name":"keyword" "$":{"id":"kwrd0090"} "$$":[{"#name":"text" "_":"binding energy PL"} {"#name":"keyword" "$":{"id":"kwrd0100"} "$$":[{"#name":"text" "_":"photoluminescence CB"} {"#name":"keyword" "$":{"id":"kwrd0110"} "$$":[{"#name":"text" "_":"conduction band |
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