Colloidal Ni2- : XCoxP nanocrystals for the hydrogen evolution reaction
Liu, Junfeng (Institut de Recerca en Energia de Catalunya)
Wang, Zhenxing (Xi'An Jiaotong University)
David, Jérémy (Institut Català de Nanociència i Nanotecnologia)
Llorca, Jordi (Universitat Politècnica de Catalunya. Departament d'Enginyeria Química)
Li, Junshan (Institut de Recerca en Energia de Catalunya)
Yu, Xiaoting (Institut de Recerca en Energia de Catalunya)
Shavel, Alexey (Institut de Recerca en Energia de Catalunya)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Meyns, Michaela (Institut de Recerca en Energia de Catalunya)
Cabot, Andreu (Institut de Recerca en Energia de Catalunya)

Fecha:	2018
Resumen:	A cost-effective and scalable approach was developed to produce monodisperse NiCoP nanocrystals (NCs) with composition tuned over the entire range (0 ≤ x ≤ 2). NiCoP NCs were synthesized using low-cost, stable and low-toxicity triphenyl phosphite (TPP) as a phosphorus source, metal chlorides as metal precursors and hexadecylamine (HDA) as a ligand. The synthesis involved the nucleation of amorphous Ni-P and its posterior crystallization and simultaneous incorporation of Co. The composition, size and morphology of the NiCoP NCs could be controlled simply by varying the ratio of Ni and Co precursors and the amounts of TPP and HDA. Ternary NiCoP-based electrocatalysts exhibited enhanced electrocatalytic activity toward the hydrogen evolution reaction (HER) compared to binary phosphides. In particular, NiCoP electrocatalysts displayed the lowest overpotential of 97 mV at J = 10 mA cm and an excellent long-term stability. DFT calculations of the Gibbs free energy for hydrogen adsorption at the surface of NiCoP NCs showed NiCoP to have the most appropriate composition to optimize this parameter within the whole NiCoP series. However, the hydrogen adsorption energy was demonstrated not to be the only parameter controlling the HER activity in NiCoP.
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 European Commission 665919 Ministerio de Economía y Competitividad ENE2015-63969-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-128
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió sotmesa a revisió
Materia:	Electrocatalytic activity ; Hydrogen adsorption ; Hydrogen evolution reactions ; Long term stability ; Nanocrystal (NCs) ; Phosphorus sources ; Scalable approach ; Triphenyl phosphite
Publicado en:	Journal of materials chemistry, Vol. 6, Issue 24 (June 2018) , p. 11453-11462, ISSN 2050-7496

DOI: 10.1039/c8ta03485k

Preprint 29 p, 5.5 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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