Research Article

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2015, 8(1): 281–287

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https://doi.org/10.1007/s12274-014-0673-y

MoS2-wrapped silicon nanowires for photoelectro- chemical water reduction

Liming Zhang1,,§, Chong Liu1,§, Andrew Barnabas Wong1,4, Joaquin Resasco2, and Peidong Yang1,3,4 (*)

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1 Department of Chemistry, University of California, Berkeley, CA 94720, USA
2 Department of Chemical Engineering, University of California, Berkeley, CA 94720, USA
3 Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
4 Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
Present address: Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
§ These authors contributed equally to this work.

Keywords: MoS2, Si nanowire array, coaxial heterostructure, photoelectrochemistry, hydrogen evolution reaction (HER)
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  • Abstract
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Integration of molybdenum disulfide (MoS2) onto high surface area photocathodes is highly desired to minimize the overpotential for the solar-powered hydrogen evolution reaction (HER). Semiconductor nanowires (NWs) are beneficial for use in photoelectrochemistry because of their large electrochemically available surface area and inherent ability to decouple light absorption and the transport of minority carriers. Here, silicon (Si) NW arrays were employed as a model photocathode system for MoS2 wrapping, and their solar-driven HER activity was evaluated. The photocathode is made up of a well-defined MoS2/TiO2/Si coaxial NW heterostructure, which yielded photocurrent density up to 15 mA/cm2 (at 0 V vs. the reversible hydrogen electrode (RHE)) with good stability under the operating conditions employed. This work reveals that earth-abundant electrocatalysts coupled with high surface area NW electrodes can provide performance comparable to noble metal catalysts for photocathodic hydrogen evolution.
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MoS2-wrapped silicon nanowires for photoelectro- chemical water reduction. Nano Res. 2015, 8(1): 281–287 https://doi.org/10.1007/s12274-014-0673-y

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