Optimization of photoelectrochemical performance in chemical bath deposited nanostructured CuO
| Autor: | Indrajit Mukhopadhyay, Abhijit Ray, Shinji Kawasaki, Utkarsh Prakash, Ranjan K. Pati, Yoshiyuki Hattori, Yosuke Ishii |
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| Rok vydání: | 2017 |
| Předmět: |
Photocurrent
Materials science Mechanical Engineering Inorganic chemistry Metals and Alloys 02 engineering and technology Electrolyte Photoelectrochemical cell 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Photocathode 0104 chemical sciences Corrosion law.invention Chemical engineering Mechanics of Materials law Materials Chemistry Direct and indirect band gaps Calcination Thin film 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 695:3655-3665 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.11.374 |
| Popis: | Low cost nanostructured CuO photocathodes are fabricated via simple alkaline bath oxidation of Cu-foil at 60 °C in the presence of (NH 4 ) 2 S 2 O 8 . The structural, morphological, electrical and optical properties of the as-grown CuO film are tuned by calcination in air up to 300 °C in order to enhance its photoelectrochemical performance. The photocathode fabricated by optimization of NaOH concentration (at 150 mM) and calcination temperature (200 °C), produces a photocurrent density of −1.3 mA/cm 2 at 0 V RHE under AM 1.5G simulated solar spectrum in nearly neutral pH (∼6.6) electrolyte. The improvement in photocurrent is attributed to enhanced photogeneration across direct band edges with a most appropriate gap of 1.55 eV instead of its inherent indirect band gap nature. The photocathode can be employed in photoelectrochemical energy conversion as well as photo-reduction of water by adopting a suitable corrosion protection scheme. |
| Databáze: | OpenAIRE |
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