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

Suram, Santosh K. and Zhou, Lan and Shinde, Aniketa and Yan, Qimin and Yu, Jie and Umehara, Mitsutaro and Stein, Helge S. and Neaton, Jeffrey B. and Gregoire, John M. (2018) Alkaline-stable nickel manganese oxides with ideal band gap for solar fuel photoanodes. Chemical Communications, 54 (36). pp. 4625-4628. ISSN 1359-7345. http://resolver.caltech.edu/CaltechAUTHORS:20180419-092221814

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Abstract

Combinatorial (photo)electrochemical studies of the (Ni–Mn)O_x system reveal a range of promising materials for oxygen evolution photoanodes. X-ray diffraction, quantum efficiency, and optical spectroscopy mapping reveal stable photoactivity of NiMnO_3 in alkaline conditions with photocurrent onset commensurate with its 1.9 eV direct band gap. The photoactivity increases upon mixture with 10–60% Ni_6MnO_8 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1039/c7cc08002fDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2018/CC/C7CC08002FPublisherArticle
http://www.rsc.org/suppdata/c7/cc/c7cc08002f/c7cc08002f1.pdfPublisherSupplementary Information
ORCID:
AuthorORCID
Suram, Santosh K.0000-0001-8170-2685
Shinde, Aniketa0000-0003-2386-3848
Umehara, Mitsutaro0000-0001-8665-0028
Stein, Helge S.0000-0002-3461-0232
Gregoire, John M.0000-0002-2863-5265
Additional Information:© 2018 The Royal Society of Chemistry. Received 16th October 2017, Accepted 9th April 2018, First published on 10th April 2018. This work is performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC000499. The authors thanks Paul F. Newhouse for assistance in optical spectra measurement. There are no conflicts to declare.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC000499
Record Number:CaltechAUTHORS:20180419-092221814
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180419-092221814
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85969
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Apr 2018 16:32
Last Modified:01 May 2018 19:46

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