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Superior methanol electrooxidation performance of (110)-faceted nickel polyhedral nanocrystals
Li, Junshan (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)
Wang, Xiang (Institut de Recerca en Energia de Catalunya)
Yu, Xiaoting (Institut de Recerca en Energia de Catalunya)
Du, Ruifeng (Institut de Recerca en Energia de Catalunya)
Zhang, Ting (Institut Català de Nanociència i Nanotecnologia)
Infante Carrió, María F. (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 (Universitat Politècnica de Catalunya. Departament d'Enginyeria Química)
Luo, Zhishan (Institut de Recerca en Energia de Catalunya)
Cabot, Andreu (Institut de Recerca en Energia de Catalunya)

Date: 2019
Abstract: We present the synthesis of (110)-faceted nickel polyhedral nanocrystals (NCs) and their characterization as electrocatalysts for the methanol oxidation reaction (MOR). Ni NCs were produced at 180 °C through the reduction in solution of a Ni salt. They were combined with carbon black and Nafion and deposited over glassy carbon to study their electrocatalytic properties. Electrodes based on (110)-faceted Ni NCs displayed a first order reaction with KOH in the concentration range from 0. 1 M to 1. 0 M. These electrodes were characterized by higher coverages of active species, but lower diffusion coefficients of the species limiting the reaction rate when compared with electrodes prepared from spherical Ni NCs. Overall, electrodes based on faceted Ni NCs displayed excellent performance with very high current densities, up to 61 mA cm, and unprecedented mass activities, up to 2 A mg, at 0. 6 V vs. Hg/HgO in 1. 0 M KOH containing 1. 0 M methanol. These electrodes also displayed a notable stability. While they suffered an activity loss of ca. 30% during the first 10000 s of operation, afterward activity stabilized at very high current densities, ∼35 mA cm, and mass activities, ∼1. 2 A mg, with only a 0. 5% decrease during operation from 20000 to 30000 s.
Note: Número d'acord de subvenció MINECO/ENE2016-77798-C4-3-R
Note: Número d'acord de subvenció MINECO/ENE2017-85087-C3
Note: Número d'acord de subvenció AGAUR/2017/SGR-327
Note: Número d'acord de subvenció MINECO/SEV-2013-0295
Note: Número d'acord de subvenció MINECO/ENE2015-63969-R
Rights: Tots els drets reservats.
Language: Anglès.
Document: article ; recerca ; submittedVersion
Subject: Active species ; Concentration ranges ; Electrocatalytic properties ; First order reactions ; High current densities ; Methanol electrooxidation ; Methanol oxidation reactions ; Nanocrystal (NCs)
Published in: Journal of materials chemistry A, Vol. 7, Issue 38 (October 2019) , p. 22036-22043, ISSN 2050-7496

DOI: 10.1039/c9ta07066d


Preprint
9 p, 2.4 MB

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 2020-03-23, last modified 2020-04-29



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