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Issue 13, 2017
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Epitaxial hetero-structure of CdSe/TiO2 nanotube arrays with PEDOT as a hole transfer layer for photoelectrochemical hydrogen evolution

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Abstract

The photocatalytic decomposition of water is believed to be able to help mitigate the crisis of fossil fuel depletion. However, obtaining high and stable photoconversion efficiency remains a challenge in photocatalytic hydrogen production. Here we report an epitaxial hetero-structure of CdSe/TiO2 nanotube arrays as efficient photo-anodes via simple, room-temperature, low-cost electrochemical deposition. With the help of a similar d spacing to TiO2, the CdSe sensitizing layer is epitaxially grown on the tube wall of the TiO2 nanotubes, resulting in an ideal coherent grain boundary and single crystal growth. The resultant photo-anode produces 30% more photocurrent than those samples without a coherent grain boundary. Notably, the especial epitaxial hetero-structure is beneficial to decrease the recombination site and accelerate the separation of photogenerated electron–hole pairs. Furthermore, an ultrathin PEDOT surface layer was developed on the epitaxial hetero-structure of CdSe/TiO2 nano-tube arrays in which it functions as both a physical passivation barrier and a hole transfer layer. As a result, significantly enhanced photocurrent density and substantially better stability have been achieved. This methodology may provide a new pathway of epitaxial growth for preparing heterogeneous junction materials which have similar d spacing.

Graphical abstract: Epitaxial hetero-structure of CdSe/TiO2 nanotube arrays with PEDOT as a hole transfer layer for photoelectrochemical hydrogen evolution

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Publication details

The article was received on 27 Nov 2016, accepted on 21 Feb 2017 and first published on 22 Feb 2017


Article type: Paper
DOI: 10.1039/C6TA10202F
Citation: J. Mater. Chem. A, 2017,5, 6233-6244
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    Epitaxial hetero-structure of CdSe/TiO2 nanotube arrays with PEDOT as a hole transfer layer for photoelectrochemical hydrogen evolution

    B. Chong, W. Zhu and X. Hou, J. Mater. Chem. A, 2017, 5, 6233
    DOI: 10.1039/C6TA10202F

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