Efficient Methanol Electrooxidation Catalyzed by Potentiostatically Grown Cu-O/OH(Ni) Nanowires: Role of Inherent Ni Impurity

Sengeni Anantharaj*, Taiki Nagamatsu, Shohei Yamaoka, Mochen Li, Suguru Noda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Complete electrooxidation of methanol in alkaline conditions is catalyzed efficiently by 3d transition metal-based oxides and hydroxides with no issues of mass-transport limitations. Among them, the oxides and hydroxides of Cu prepared using various methods were said to be exceptional. In this work, the methanol oxidation reaction (MOR) activity of such a copper oxide/hydroxide catalyst is advanced by making use of the three-dimensional (3D) configuration of the Cu foam substrate and inherent Ni impurity present in it. The 3D configuration of the Cu foam substrate enabled a larger active surface area per unit geometrical area. The MOR current densities 110 and 310 mA cm-2 at 0.60 and 0.75 V vs Hg/HgO, respectively, testify the outstanding MOR activity of Cu-O/OH nanowires with Ni impurity (Cu-O/OH(Ni)). Excellent chronoamperometric stability at 0.55 V vs Hg/HgO and relatively lower activation energy at all potentials in the catalytic turnover region further ascertain the superiority of Cu-O/OH(Ni). Specific activity measurements implied that Cu-O/OH(Ni) benefited from intrinsic activity enhancement by the presence of inherent Ni impurity. This work, thus, reveals a facile way of enhancing the MOR activity of Cu-based MOR electrocatalysts.

Original languageEnglish
JournalACS Applied Energy Materials
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • copper hydroxide
  • copper oxide
  • electrocatalysis
  • methanol electrooxidation
  • nanowires
  • potentiostatic anodization

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Chemistry

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