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Stable Quantum Dot Photoelectrolysis Cell for Unassisted Visible Light Solar Water Splitting

By Hong Bin Yang (1728994), Jianwei Miao (1233453), Sung-Fu Hung (1438516), Fengwei Huo (1607113), Hao Ming Chen (1438507) and Bin Liu (5899)


Sunlight is an ideal source of energy, and converting sunlight into chemical fuels, mimicking what nature does, has attracted significant attention in the past decade. In terms of solar energy conversion into chemical fuels, solar water splitting for hydrogen production is one of the most attractive renewable energy technologies, and this achievement would satisfy our increasing demand for carbon-neutral sustainable energy. Here, we report corrosion-resistant, nanocomposite photoelectrodes for spontaneous overall solar water splitting, consisting of a CdS quantum dot (QD) modified TiO<sub>2</sub> photoanode and a CdSe QD modified NiO photocathode, where cadmium chalcogenide QDs are protected by a ZnS passivation layer and gas evolution cocatalysts. The optimized device exhibited a maximum efficiency of 0.17%, comparable to that of natural photosynthesis with excellent photostability under visible light illumination. Our device shows spontaneous overall water splitting in a nonsacrificial environment under visible light illumination (λ > 400 nm) through mimicking nature’s “Z-scheme” process. The results here also provide a conceptual layout to improve the efficiency of solar-to-fuel conversion, which is solely based on facile, scalable solution-phase techniques

Topics: Evolutionary Biology, Ecology, Inorganic Chemistry, Computational Biology, Space Science, Environmental Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, chemical fuels, Unassisted Visible Light Solar Water SplittingSunlight, CdS quantum dot, nature, efficiency, Stable Quantum Dot Photoelectrolysis Cell, gas evolution cocatalysts, water splitting, illumination, conversion, TiO 2 photoanode, ZnS passivation layer, device, cadmium chalcogenide QDs
Year: 2014
DOI identifier: 10.1021/nn503751s.s001
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Provided by: FigShare
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