Controlled synthesis of a Ni2 dual-atom catalyst for synergistic CO2 electroreduction

被引:52
作者
Liang, Xiang-Ming [1 ]
Wang, Hong-Juan [1 ]
Zhang, Chao [1 ]
Zhong, Di-Chang [1 ]
Lu, Tong -Bu [1 ]
机构
[1] Tianjin Univ Technol, Inst New Energy Mat & Low Carbon Technol, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金; 中国博士后科学基金;
关键词
EFFICIENT ELECTROREDUCTION; SCALING RELATIONS; DOPED CARBON; METAL; SITES; REDUCTION; IDENTIFICATION; PLATINUM; NUMBER;
D O I
10.1016/j.apcatb.2022.122073
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Dual-atom catalysts (DACs) have drawn much attention recently by virtue of the synergistic effect within the dual-atom sites, while controlled synthesis of pure DACs remains a challenge. Herein, a uniform dual-atom Ni-2 catalyst (Ni-2-NCNT) was controllably synthesized using a dinuclear Ni complex as the precursor, in which directly bonded Ni-2 pairs are uniformly anchored on N-doped carbon nanotubes. Ni-2-NCNT exhibits extraordinary catalytic activity, selectivity and stability for electroreduction of CO2 into CO, with a partial current density for CO (j(CO)) of 76 mA cm(-2). The j(CO) mass activity of Ni-2-NCNT is 2.3-times higher than that of corresponding Ni-1-NCNT single-atom catalyst. DFT calculations reveal that the synergistic coordination of *COOH at the Ni-2 dual-atom site can dramatically lower the reaction free energy for *COOH formation, thus promoting the CO2 electroreduction.
引用
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页数:8
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