On the effect of Cu on the activity of carbon supported Ni nanoparticles for hydrogen electrode reactions in alkaline medium

Alexandr G. Oshchepkov, Pavel A. Simonov, Olga V. Cherstiouk, Renat R. Nazmutdinov, Dmitrii V. Glukhov, Vladimir I. Zaikovskii, Tatyana Yu Kardash, Ren I. Kvon, Antoine Bonnefont, Alexandr Simonov, Valentin N. Parmon, Elena R. Savinova

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31 Citations (Scopus)

Abstract

Effects of adding varied amounts of copper to carbon-supported nickel particles on their structure, composition and electrocatalytic activity for the hydrogen oxidation and evolution reactions in alkaline medium have been explored. Ni1-xCux/C catalysts were prepared by the incipient wetness impregnation. Comprehensive characterization of the catalysts included X-ray powder diffraction, X-ray photoelectron spectroscopic, transmission electron microscopic and cyclic voltammetric analyses, while atomistic Monte Carlo simulations have been undertaken to obtain further insights into the structure of the bimetallic NiCu nanoparticles. We found that compared to monometallic Ni, NiCu nanoparticles show lower propensity towards oxidation under ambient conditions. Furthermore, we report that adding Cu allows increasing the surface-weighted electrocatalytic activity, and the specific surface area of Ni1-xCux/C electrodes, both contributing to a ca four-fold enhancement of the massweighted activity. The nature of the synergistic interactions between Ni and Cu is proposed on the basis of the analysis of experimental data and Monte Carlo structural modelling results.

Original languageEnglish
Pages (from-to)1181-1192
Number of pages12
JournalTopics in Catalysis
Volume58
Issue number18-20
DOIs
Publication statusPublished - 1 Nov 2015

Keywords

  • Alkaline solutions
  • Carbon support
  • Copper
  • Hydrogen oxidation and evolution reactions
  • Monte carlo simulations
  • Nickel

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