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NiSn bimetallic nanoparticles as stable electrocatalysts for methanol oxidation reaction
Li, Junshan (Institut de Recerca en Energia de Catalunya)
Luo, Zhishan (Institut de Recerca en Energia de Catalunya)
Zuo, Yong (Institut de Recerca en Energia de Catalunya)
Liu, Junfeng (Institut de Recerca en Energia de Catalunya)
Zhang, Ting (Institut Català de Nanociència i Nanotecnologia)
Tang, Pengyi (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Llorca, Jordi (Institute of Energy Technologies. Department of Chemical Engineering and Barcelona Research Center in Multiscale Science and Engineering. Universitat Politècnica de Catalunya. EEBE)
Cabot, Andreu (Institut de Recerca En Energía de Catalunya)

Date: 2018
Abstract: Nickel is an excellent alternative catalyst to high cost Pt and Pt-group metals as anode material in direct methanol fuel cells. However, nickel presents a relatively low stability under operation conditions, even in alkaline media. In this work, a synthetic route to produce bimetallic NiSn nanoparticles (NPs) with tuned composition is presented. Through co-reduction of the two metals in the presence of appropriate surfactants, 3–5 nm NiSn NPs with tuned Ni/Sn ratios were produced. Such NPs were subsequently supported on carbon black and tested for methanol electro-oxidation in alkaline media. Among the different stoichiometries tested, the most Ni-rich alloy exhibited the highest electrocatalytic activity, with mass current density of 820 mA mg⁻¹ at 0. 70 V (vs. Hg/HgO). While this activity was comparable to that of pure nickel NPs, NiSn alloys showed highly improved stabilities over periods of 10,000 s at 0. 70 V. We hypothesize this experimental fact to be associated to the collaborative oxidation of the byproducts of methanol which poison the Ni surface or to the prevention of the tight adsorption of these species on the Ni surface by modifying its surface chemistry or electronic density of states.
Note: Número d'acord de subvenció MINECO/ENE2017-85087-C3
Note: Número d'acord de subvenció MINECO/ENE2015-63969-R
Note: Número d'acord de subvenció MINECO/SEV-2013-0295
Note: Número d'acord de subvenció AGAUR/2014/SGR-1638
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. Creative Commons
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: Electrocatalysis ; Methanol oxidation ; Colloidal synthesis ; Bimetallic nanoparticles
Published in: Applied catalysis B: environmental, Vol. 234 (Oct. 2018) , p. 10-18, ISSN 0926-3373

DOI: 10.1016/j.apcatb.2018.04.017


Available from: 2020-10-30
Postprint

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2019-07-30, last modified 2019-09-30



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