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A heteroelectrode structure for solar water splitting: integrated cobalt ditelluride across a TiO2-passivated silicon microwire array

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Abstract

Cobalt ditelluride as a cocatalyst on the surface of a silicon microwire array (Si-MWs) and as a heterocathode structure for the hydrogen evolution reaction was synthesized via a one-step drop-casting method. The improvement in the photo-electrocatalytic efficiency, including the 0.66 V anodic shift in the onset potential and the −24.0 mA cm−2 photocurrent density, is comparable to that of other cocatalyst systems for water reduction. The photocurrent decay of CoTe2@Si-MWs further improved to roughly −10 mA cm−2 by deposition of 10 nm atomic-layer-deposited TiO2 on the Si-MW photocathode for 67 min. Outcomes of this study may demonstrate the possibility of introducing a new class of telluride cocatalyst heterocathode system as an alternative to noble metals in facilitating the water splitting reaction. The cobalt ditelluride across the TiO2-passivated Si-MWs heterocathode is reported to have an effective response to solar water reduction for the first time.

Graphical abstract: A heteroelectrode structure for solar water splitting: integrated cobalt ditelluride across a TiO2-passivated silicon microwire array

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Publication details

The article was received on 28 Dec 2016, accepted on 03 Feb 2017, published on 06 Feb 2017 and first published online on 06 Feb 2017


Article type: Paper
DOI: 10.1039/C6CY02688E
Citation: Catal. Sci. Technol., 2017, Advance Article
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    A heteroelectrode structure for solar water splitting: integrated cobalt ditelluride across a TiO2-passivated silicon microwire array

    B. Bazri, Y. Lin, T. Lu, C. Chen, E. Kowsari, S. Hu and R. Liu, Catal. Sci. Technol., 2017, Advance Article , DOI: 10.1039/C6CY02688E

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