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Issue 32, 2012
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Hierarchical Cu2O photocathodes with nano/microspheres for solar hydrogen generation

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Abstract

A hierarchical p-type Cu2O film with nano/microspheres on copper foil is successfully synthesized via a facile and cost-effective liquid reduction route through transformation of a lotus-like CuO/Cu(OH)2 nanosheet/nanowire structure. Various sizes of sphere-like Cu2O are transformed from CuO nanosheets and Cu(OH)2 nanowires by chemically reducing the oxides from Cu2+ to Cu1+ in a solution of ascorbic acid at a low temperature of 60 °C. Mott–Schottky analysis shows the flat band potential of the sphere-like Cu2O film to be −0.11 V and an acceptor concentration of 2.7 × 1020 cm−3. A direct band gap of 2.02 eV in Cu2O film is determined by incident photon-to-electron conversion efficiency measurements. Significantly, this hierarchical Cu2O photocathode exhibits remarkable photoelectrochemical activity in visible light. These results demonstrate that the Cu2O film with nano/microspheres has great potential in solar hydrogen applications.

Graphical abstract: Hierarchical Cu2O photocathodes with nano/microspheres for solar hydrogen generation

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Article information


Submitted
30 Aug 2012
Accepted
17 Oct 2012
First published
19 Oct 2012

RSC Adv., 2012,2, 12455-12459
Article type
Paper

Hierarchical Cu2O photocathodes with nano/microspheres for solar hydrogen generation

Y. Hsu, C. Yu, Y. Chen and Y. Lin, RSC Adv., 2012, 2, 12455
DOI: 10.1039/C2RA21979D

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