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Electrocatalytic Water Oxidation Promoted by 3 D Nanoarchitectured Turbostratic δ-MnOx on Carbon Nanotubes
KTH Royal Institute of Technology, Stockholm, Sweden. (Department of Chemistry)
KTH Royal Institute of Technology, Stockholm, Sweden. (Department of Fibre and Polymer Technology)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
KTH Royal Institute of Technology, Stockholm, Sweden. (Department of Chemistry)
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2017 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 10, no 22, 4472-4478 p.Article in journal (Refereed) Published
Abstract [en]

The development of manganese-based water oxidation electrocatalysts is desirable for the production of solar fuels, as manganese is earth-abundant, inexpensive, non-toxic, and has been employed by the Photosystem II in nature for a billion years. Herein, we directly constructed a 3 D nanoarchitectured turbostratic δ-MnOx on carbon nanotube-modified nickel foam (MnOx/CNT/NF) by electrodeposition and a subsequent annealing process. The MnOx/CNT/NF electrode gives a benchmark catalytic current density (10 mA cm−2) at an overpotential (η) of 270 mV under alkaline conditions. A steady current density of 19 mA cm−2 is obtained during electrolysis at 1.53 V for 1.0 h. To the best of our knowledge, this work represents the most efficient manganese-oxide-based water oxidation electrode and demonstrates that manganese oxides, as a structural and functional model of oxygen-evolving complex (OEC) in Photosystem II, can also become comparable to those of most Ni- and Co-based catalysts.

Place, publisher, year, edition, pages
2017. Vol. 10, no 22, 4472-4478 p.
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Chemistry
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URN: urn:nbn:se:uu:diva-337922DOI: 10.1002/cssc.201700824OAI: oai:DiVA.org:uu-337922DiVA: diva2:1171164
Available from: 2018-01-05 Created: 2018-01-05 Last updated: 2018-01-18Bibliographically approved

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Valvo, Mario

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