Ultrathin High Surface Area Nickel Boride (NixB) Nanosheets as Highly Efficient Electrocatalyst for Oxygen Evolution
Masa, Justus (Ruhr-Universität Bochum (Alemanya))
Sinev, Ilya (Ruhr-Universität Bochum (Alemanya))
Mistry, Hemma (Ruhr-Universität Bochum (Alemanya))
Ventosa, Edgar (Ruhr-Universität Bochum (Alemanya))
De La Mata, Maria (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Muhler, Martin (Ruhr-Universität Bochum (Alemanya))
Roldan Cuenya, Beatriz (Ruhr-Universität Bochum (Alemanya))
Schuhmann, Wolfgang (Ruhr-Universität Bochum (Alemanya))

Títol variant:	Nickel boride (NixB) as a highly efficient catalyst for oxygen evolution
Data:	2017
Resum:	The overriding obstacle to mass production of hydrogen from water as the premium fuel for powering our planet is the frustratingly slow kinetics of the oxygen evolution reaction (OER). Additionally, inadequate understanding of the key barriers of the OER is a hindrance to insightful design of advanced OER catalysts. This study presents ultrathin amorphous high-surface area nickel boride (NiB) nanosheets as a low-cost, very efficient and stable catalyst for the OER for electrochemical water splitting. The catalyst affords 10 mA cm at 0. 38 V overpotential during OER in 1. 0 m KOH, reducing to only 0. 28 V at 20 mA cm when supported on nickel foam, which ranks it among the best reported nonprecious catalysts for oxygen evolution. Operando X-ray absorption fine-structure spectroscopy measurements reveal prevalence of NiOOH, as well as Ni-B under OER conditions, owing to a Ni-B core@nickel oxyhydroxide shell (Ni-B@NiOH) structure, and increase in disorder of the NiOH layer, thus revealing important insight into the transient states of the catalyst during oxygen evolution.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Hydrogen evolution ; Nickel boride ; Oxygen evolution ; Water oxidation ; Water splitting ; XAFS
Publicat a:	Advanced Energy Materials, Vol. 7, Núm. 17 (September 2017) , article 1700381, ISSN 1614-6840

DOI: 10.1002/aenm.201700381

Post-print 18 p, 1.4 MB

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