1. Vapor Phase Fabrication of Nanoheterostructures Based on ZnO for Photoelectrochemical Water Splitting
- Author
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Barreca, Davide, Carraro, Giorgio, Gasparotto, Chiara, Altantzis, Thomas, Sada, Cinzia, Kaunisto, Kimmo, Ruoko, Tero-Petri, Bals, Sara, Gasparotto, Alberto, and Maccato, Chiara
- Subjects
Materials science ,Nanotechnology ,02 engineering and technology ,Chemical vapor deposition ,010402 general chemistry ,7. Clean energy ,01 natural sciences ,water splitting ,Overlayer ,Sputtering ,nanoheterostructures ,WO3 ,Photocurrent ,Nanocomposite ,business.industry ,photoelectrochemical water splitting ,Physics ,Mechanical Engineering ,Fe2O3 , nanoheterostructures, water splitting, WO3 , ZnO ,021001 nanoscience & nanotechnology ,Tin oxide ,0104 chemical sciences ,Chemistry ,Nanocrystal ,Mechanics of Materials ,ZnO ,Optoelectronics ,Water splitting ,Fe2O3 ,0210 nano-technology ,business - Abstract
Nanoheterostructures based on metal oxide semiconductors have emerged as promising materials for the conversion of sunlight into chemical energy. In the present study, ZnO-based nanocomposites have been developed by a hybrid vapor phase route, consisting in the chemical vapor deposition of ZnO systems on fluorine-doped tin oxide substrates, followed by the functionalization with Fe2O3 or WO3via radio frequency-sputtering. The target systems are subjected to thermal treatment in air both prior and after sputtering, and their properties, including structure, chemical composition, morphology, and optical absorption, are investigated by a variety of characterization methods. The obtained results evidence the formation of highly porous ZnO nanocrystal arrays, conformally covered by an ultrathin Fe2O3 or WO3 overlayer. Photocurrent density measurements for solar-triggered water splitting reveal in both cases a performance improvement with respect to bare zinc oxide, that is mainly traced back to an enhanced separation of photogenerated charge carriers thanks to the intimate contact between the two oxides. This achievement can be regarded as a valuable result in view of future optimization of similar nanoheterostructured photoanodes.
- Published
- 2017