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A Low-Temperature Molecular Precursor Approach to Copper-Based Nano-Sized Digenite Mineral for Efficient Electrocatalytic Oxygen Evolution Reaction

Chakraborty, Biswarup; Kalra, Shweta; Beltrán‐Suito, Rodrigo; Das, Chittaranjan; Hellmann, Tim; Menezes, Prashanth W.; Driess, Matthias

Abstract:
In the urge of designing noble metal-free and sustainable electrocatalysts for oxygen evolution reaction (OER), herein, a mineral Digenite Cu$_{9}$S$_{5}$ has been prepared from a molecular copper(I) precursor, [{(PyHS) $_{2}$Cu$^{l}$ (PyHS)} $_{2}$] (OTf)$_{2}$ (1), and utilized as an anode material in electrocatalytic OER for the first time. A hot injection of 1 yielded a pure phase and highly crystalline Cu$_{9}$S$_{5}$, which was then electrophoretically deposited (EPD) on a highly conducting nickel foam (NF) substrate. When assessed as an electrode for OER, the Cu$_{9}$S$_{5}$/NF displayed an overpotential of merely 298±3 mV at a current density of 10 mAcm$^{-2}$ in alkaline media. The overpotential recorded here supersedes the value obtained for the best reported Cu-based as well as the benchmark precious-metal-based RuO$_{2}$ and IrO$_{2}$ electrocatalysts. In addition, the choronoamperometric OER indicated the superior stability of Cu$_{9}$S$_{5}$/NF, rendering its suitability as the sustainable anode material for practical feasibility. The excellent catalytic activity of Cu$_{9}$S$_{5}$ can be attributed to the formation of a crystalline CuO overlayer on the conductive Cu$_{9}$S$_{5}$ that behaves as active species to facilitate OER. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000117531
Veröffentlicht am 04.03.2020
Originalveröffentlichung
DOI: 10.1002/asia.202000022
Scopus
Zitationen: 4
Web of Science
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 16.03.2020
Sprache Englisch
Identifikator ISSN: 1861-471X, 1861-4728
KITopen-ID: 1000117531
Erschienen in Chemistry
Verlag Wiley-VCH Verlag
Band 15
Heft 6
Seiten 852-859
Vorab online veröffentlicht am 03.02.2020
Nachgewiesen in Scopus
Web of Science
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