Ultrathin High Surface Area Nickel Boride (NixB) Nanosheets as Highly Efficient Electrocatalyst for Oxygen Evolution

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 advanc...

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Detalles Bibliográficos
Autores: Masa, Justus|||0000-0002-8555-5157, Sinev, Ilya, Mistry, Hemma, Ventosa, Edgar, De La Mata, Maria|||0000-0002-1581-4838, Arbiol i Cobos, Jordi|||0000-0002-0695-1726, Muhler, Martin, Roldan Cuenya, Beatriz, Schuhmann, Wolfgang|||0000-0003-2916-5223
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:194893
Acceso en línea:https://ddd.uab.cat/record/194893
https://dx.doi.org/urn:doi:10.1002/aenm.201700381
Access Level:acceso abierto
Palabra clave:Hydrogen evolution
Nickel boride
Oxygen evolution
Water oxidation
Water splitting
XAFS
Descripción
Sumario: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.

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