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Issue 18, 2014
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Highly efficient photoelectrochemical response by sea-urchin shaped ZnO/TiO2 nano/micro hybrid heterostructures co-sensitized with CdS/CdSe

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Abstract

Photoelectrochemical cells have existed for decades. However, the poor efficiency of such devices is still problematic because of trade-offs between different materials properties used for photoelectrochemical reactions. Here we report a novel photoanode architecture consisting of CdS/CdSe co-sensitized sea urchin-shaped ZnO/TiO2-based nano/micro hybrid heterostructures that simultaneously offer better light scattering over the entire visible frequency domain, better separation of photo-generated charge carriers, significantly improved light absorption that extends over a broad visible spectrum, and better transport of electrons through a highly connected network of conducting ZnO nanowires than existing architectures. Use of the synthesized structures as photoanodes in a photoelectrochemical cell yielded a photocurrent density as high as 11.8 mA cm−2 with a remarkable photo-conversion efficiency of 6.4%.

Graphical abstract: Highly efficient photoelectrochemical response by sea-urchin shaped ZnO/TiO2 nano/micro hybrid heterostructures co-sensitized with CdS/CdSe

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Article information


Submitted
30 Dec 2013
Accepted
17 Feb 2014
First published
17 Feb 2014

J. Mater. Chem. A, 2014,2, 6474-6479
Article type
Paper
Author version available

Highly efficient photoelectrochemical response by sea-urchin shaped ZnO/TiO2 nano/micro hybrid heterostructures co-sensitized with CdS/CdSe

Z. Ali, I. Shakir and D. J. Kang, J. Mater. Chem. A, 2014, 2, 6474
DOI: 10.1039/C3TA15439D

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