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Issue 36, 2018
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Alkaline-stable nickel manganese oxides with ideal band gap for solar fuel photoanodes

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Abstract

Combinatorial (photo)electrochemical studies of the (Ni–Mn)Ox system reveal a range of promising materials for oxygen evolution photoanodes. X-ray diffraction, quantum efficiency, and optical spectroscopy mapping reveal stable photoactivity of NiMnO3 in alkaline conditions with photocurrent onset commensurate with its 1.9 eV direct band gap. The photoactivity increases upon mixture with 10–60% Ni6MnO8 providing an example of enhanced charge separation via heterojunction formation in mixed-phase thin film photoelectrodes. Density functional theory-based hybrid functional calculations of the band edge energies in this oxide reveal that a somewhat smaller than typical fraction of exact exchange is required to explain the favorable valence band alignment for water oxidation.

Graphical abstract: Alkaline-stable nickel manganese oxides with ideal band gap for solar fuel photoanodes

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Publication details

The article was received on 16 Oct 2017, accepted on 09 Apr 2018 and first published on 10 Apr 2018


Article type: Communication
DOI: 10.1039/C7CC08002F
Citation: Chem. Commun., 2018,54, 4625-4628
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    Alkaline-stable nickel manganese oxides with ideal band gap for solar fuel photoanodes

    S. K. Suram, L. Zhou, A. Shinde, Q. Yan, J. Yu, M. Umehara, H. S. Stein, J. B. Neaton and J. M. Gregoire, Chem. Commun., 2018, 54, 4625
    DOI: 10.1039/C7CC08002F

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