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

Behrouz Bazri, Yu Chen Lin, Tzu Hsiang Lu, Chih Jung Chen, Elaheh Kowsari, Shu Fen Hu, Ru Shi Liu

Research output: Contribution to journalArticle

15 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1488-1496
Number of pages9
JournalCatalysis Science and Technology
Volume7
Issue number7
DOIs
Publication statusPublished - 2017 Jan 1

ASJC Scopus subject areas

  • Catalysis

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