催化作用
介孔材料
铜
甲醇
氧还原
化学工程
电催化剂
氧还原反应
氧化态
材料科学
化学
电化学
无机化学
电极
物理化学
有机化学
工程类
作者
Tingting Sun,Yinlong Li,Tingting Cui,Lianbin Xu,Yang‐Gang Wang,Wenxing Chen,Pianpian Zhang,Tianyu Zheng,Xianzhang Fu,Shaolong Zhang,Zedong Zhang,Dingsheng Wang,Yadong Li
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-07-22
卷期号:20 (8): 6206-6214
被引量:180
标识
DOI:10.1021/acs.nanolett.0c02677
摘要
Herein, we report efficient single copper atom catalysts that consist of dense atomic Cu sites dispersed on a three-dimensional carbon matrix with highly enhanced mesoporous structures and improved active site accessibility (Cu-SA/NC(meso)). The ratio of +1 to +2 oxidation state of the Cu sites in the Cu-SA/NC(meso) catalysts can be controlled by varying the urea content in the adsorption precursor, and the activity for ORR increases with the addition of Cu1+ sites. The optimal Cu1+-SA/NC(meso)-7 catalyst with highly accessible Cu1+ sites exhibits superior ORR activity in alkaline media with a half-wave potential (E1/2) of 0.898 V vs RHE, significantly exceeding the commercial Pt/C, along with high durability and enhanced methanol tolerance. Control experiments and theoretical calculations demonstrate that the superior ORR catalytic performance of Cu1+-SA/NC(meso)-7 catalyst is attributed to the atomically dispersed Cu1+ sites in catalyzing the reaction and the advantage of the introduced mesoporous structure in enhancing the mass transport.
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