TY - JOUR
T1 - Efficient Methanol Electrooxidation Catalyzed by Potentiostatically Grown Cu-O/OH(Ni) Nanowires
T2 - Role of Inherent Ni Impurity
AU - Anantharaj, Sengeni
AU - Nagamatsu, Taiki
AU - Yamaoka, Shohei
AU - Li, Mochen
AU - Noda, Suguru
N1 - Funding Information:
S.A. acknowledges the funding support for researchers from the Research Institute for Science and Engineering, Waseda University.
Publisher Copyright:
©
PY - 2022/1/24
Y1 - 2022/1/24
N2 - 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.
AB - 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.
KW - copper hydroxide
KW - copper oxide
KW - electrocatalysis
KW - methanol electrooxidation
KW - nanowires
KW - potentiostatic anodization
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U2 - 10.1021/acsaem.1c02943
DO - 10.1021/acsaem.1c02943
M3 - Article
AN - SCOPUS:85121977774
VL - 5
SP - 419
EP - 429
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
SN - 2574-0962
IS - 1
ER -