Role of Boron and Phosphorus in Enhanced Electrocatalytic Oxygen Evolution by Nickel Borides and Nickel Phosphides
Masa, Justus (Ruhr-Universität Bochum. Center for Electrochemical Sciences)
Andronescu, Corina (Ruhr-Universität Bochum. Center for Electrochemical Sciences)
Antoni, Hendrik (Ruhr-Universität Bochum (Alemanya))
Sinev, Ilya (Ruhr-Universität Bochum. Department of Physics)
Seisel, Sabine (Ruhr-Universität Bochum. Center for Electrochemical Sciences)
Elumeeva, Karina (Ruhr-Universität Bochum. Center for Electrochemical Sciences)
Barwe, Stephan (Ruhr-Universität Bochum. Center for Electrochemical Sciences)
Martí-Sánchez, Sara (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Roldan Cuenya, Beatriz (Fritz-Haber Institute of the Max Planck Society)
Muhler, Martin (Ruhr-Universität Bochum. Department of Physics)
Schuhmann, Wolfgang (Ruhr-Universität Bochum. Center for Electrochemical Sciences)

Fecha:	2019
Resumen:	The modification of nickel with boron or phosphorus leads to significant enhancement of its electrocatalytic activity for the oxygen evolution reaction (OER). However, the precise role of the guest elements, B and P, in enhancing the OER of the host element (Ni) remains unclear. Herein, we present insight into the role of B and P in enhancing electrocatalysis of oxygen evolution by nickel borides and nickel phosphides. The apparent activation energy, E*, of electrocatalytic oxygen evolution on NiP was 78. 4 kJ/mol, on NiB 65. 4 kJ/mol, and on Ni nanoparticles 94. 0 kJ/mol, thus revealing that both B and P affect the intrinsic activity of nickel. XPS data revealed shifts of −0. 30 and 0. 40 eV in the binding energy of the Ni 2p peak of NiB and NiP, respectively, with respect to that of pure Ni at 852. 60 eV, thus indicating that B and P induce opposite electronic effects on the surface electronic structure of Ni. The origin of enhanced activity for oxygen evolution cannot, therefore, be attributed to such electronic modification or ligand effect. Severe changes induced on the nickel lattice, specifically, the Ni-Ni atomic order and interatomic distances (strain effect), by the presence of the guest atoms seem to be the dominant factors responsible for enhanced activity of oxygen evolution in nickel borides and nickel phosphides.
Ayudas:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Ministerio de Economía y Competitividad ENE2017-85087-C3 Ministerio de Economía y Competitividad SEV-2013-0295
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió sotmesa a revisió
Materia:	Nickel boride ; Nickel phosphide ; Oxygen evolution ; Boron ; Phosphorus
Publicado en:	ChemElectroChem, Vol. 6, Issue 1 (January 2019) , p. 235-240, ISSN 2196-0216

DOI: 10.1002/celc.201800669

Preprint 19 p, 5.8 MB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
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