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Cu2O/CuO Bilayered Composite as a High-Efficiency Photocathode for Photoelectrochemical Hydrogen Evolution Reaction
Open accessAbstract
Solar powered hydrogen evolution reaction (HER) is one of the key reactions in solar-to-chemical energy conversion. It is desirable to develop photocathodic materials that exhibit high activity toward photoelectrochemical (PEC) HER at more positive potentials because a higher potential means a lower overpotential for HER. In this work, the Cu 2 O/CuO bilayered composites were prepared by a facile method that involved an electrodeposition and a subsequent thermal oxidation. The resulting Cu 2 O/CuO bilayered composites exhibited a surprisingly high activity and good stability toward PEC HER, expecially at high potentials in alkaline solution. The photocurrent density for HER was 3.15 mA·cm−2 at the potential of 0.40 V vs. RHE, which was one of the two highest reported at the same potential on copper-oxide-based photocathode. The high photoactivity of the bilayered composite was ascribed to the following three advantages of the Cu 2 O/CuO heterojunction: (1) the broadened light absorption band that made more efficient use of solar energy, (2) the large space-charge-region potential that enabled a high efficiency for electron-hole separation, and (3) the high majority carrier density that ensured a faster charge transportation rate. This work reveals the potential of the Cu 2 O/CuO bilayered composite as a promising photocathodic material for solar water splitting.
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Metadata
- Authors
- Yang, Y., Xu, D., Wu, Q., & Diao, P.
- Venue
- Scientific Reports
- Published
- 2016-10-17
- Volume
- 6
- Issue
- 1
- Pages
- 35158-35158
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W2539355162
- Cited by
- 573
- References
- 51
- FWCI
- 11.62
- Type
- journal article
- Language
- en
- Open access
- gold
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