杂质
纳米线
氢氧化物
催化作用
甲醇
基质(水族馆)
过渡金属
铜
材料科学
氧化物
无机化学
化学
纳米技术
冶金
有机化学
地质学
海洋学
作者
Sengeni Anantharaj,Taiki Nagamatsu,Shohei Yamaoka,Mochen Li,Suguru Noda
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-12-16
卷期号:5 (1): 419-429
被引量:15
标识
DOI:10.1021/acsaem.1c02943
摘要
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.
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