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Issue 5, 2019
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Design of an amorphous TaOx multifunctional interfacial layer on photocathodes for photoelectrochemical H2 evolution

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Abstract

A novel TaOx multifunctional layer which is transparent and co-catalytically active was applied to photoelectrodes for hydrogen production. We found that amorphous TaOx was in situ transformed into amorphous TaOx/Ta(OH)x in the photoelectrochemical reaction, which is a more active form for hydrogen evolution. The TaOx/Ta(OH)x multifunctional layer enhanced not only charge separation but also stability and HER kinetics when it was deposited on a p-type CuInS2 model photocathode. The new band alignment and the widened depletion region of CuInS2/TaOx were revealed by electrochemical impedance spectroscopy and IPCE analysis. The TaOx deposited CuInS2 photocathode shows a higher photocurrent at −0.3 V vs. RHE compared to CuInS2 or even Pt-decorated CuInS2. A novel multifunctional layer was successfully designed and demonstrated for photocathodes without noble metals, which can minimize the structure of photoelectrodes.

Graphical abstract: Design of an amorphous TaOx multifunctional interfacial layer on photocathodes for photoelectrochemical H2 evolution

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Publication details

The article was received on 07 Nov 2018, accepted on 18 Dec 2018 and first published on 19 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10738F
Citation: J. Mater. Chem. A, 2019,7, 2041-2047

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    Design of an amorphous TaOx multifunctional interfacial layer on photocathodes for photoelectrochemical H2 evolution

    S. Y. Chae, S. Kim and O. Joo, J. Mater. Chem. A, 2019, 7, 2041
    DOI: 10.1039/C8TA10738F

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