A heteroelectrode structure for solar water splitting: integrated cobalt ditelluride across a TiO2-passivated silicon microwire array
| Autor: | Shu Fen Hu, Behrouz Bazri, Yu Chen Lin, Elaheh Kowsari, Tzu Hsiang Lu, Chih Jung Chen, Ru-Shi Liu |
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| Rok vydání: | 2017 |
| Předmět: |
Photocurrent
Silicon business.industry Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Photocathode 0104 chemical sciences Anode chemistry.chemical_compound chemistry Telluride Water splitting Optoelectronics 0210 nano-technology business Cobalt Deposition (law) |
| Zdroj: | Catalysis Science & Technology. 7:1488-1496 |
| ISSN: | 2044-4761 2044-4753 |
| DOI: | 10.1039/c6cy02688e |
| Popis: | Cobalt ditelluride as a cocatalyst on the surface of a silicon microwire array (Si-MWs) and as a heterocathode structure for the hydrogen evolution reaction was synthesized via a one-step drop-casting method. The improvement in the photo-electrocatalytic efficiency, including the 0.66 V anodic shift in the onset potential and the −24.0 mA cm−2 photocurrent density, is comparable to that of other cocatalyst systems for water reduction. The photocurrent decay of CoTe2@Si-MWs further improved to roughly −10 mA cm−2 by deposition of 10 nm atomic-layer-deposited TiO2 on the Si-MW photocathode for 67 min. Outcomes of this study may demonstrate the possibility of introducing a new class of telluride cocatalyst heterocathode system as an alternative to noble metals in facilitating the water splitting reaction. The cobalt ditelluride across the TiO2-passivated Si-MWs heterocathode is reported to have an effective response to solar water reduction for the first time. |
| Databáze: | OpenAIRE |
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