Chinese Journal of Catalysis ›› 2024, Vol. 59: 126-136.DOI: 10.1016/S1872-2067(23)64630-3

• Articles • Previous Articles     Next Articles

Tailoring CuNi heteronuclear diatomic catalysts: Precision in structural design for exceptionally selective CO2 photoreduction to ethanol

Entian Cuia, Yulian Lua, Jizhou Jiangb,*(), Arramel e, Dingsheng Wangc, Tianyou Zhaid   

  1. aKey Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China
    bSchool of Environmental Ecology and Biological Engineering, School of Chemistry and Environmental Engineering, Key Laboratory of Green Chemical Engineering Process of Ministry of Education, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Novel Catalytic Materials of Hubei Engineering Research Center, Wuhan Institute of Technology, Wuhan 430205, Hubei, China
    cDepartment of Chemistry, Tsinghua University, Beijing 100084, China
    dState Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
    eNano Center Indonesia, Jalan Raya PUSPIPTEK, South Tangerang, Banten 15314, Indonesia
  • Received:2023-12-29 Accepted:2024-02-07 Online:2024-04-18 Published:2024-04-15
  • Contact: *E-mail:027wit@163.com (J. Jiang).
  • Supported by:
    The National Natural Science Foundation of China(62004143);The Key R&D Program of Hubei Province(2022BAA084)

Abstract:

The photocatalytic reduction of CO2 to ethanol has attracted extensive attention, particularly for intricate C-C coupling. In this study, we propose a synthetic pathway for asymmetric CuNi heteronuclear diatoms (CuNi HDAs) by anchoring single Cu atoms on the Ni sites of (Ni, Zr)-UiO-66-NH2 to enhance C-C coupling. Cu-(Ni,Zr)-UiO-66-NH2 efficiently performs photocatalytic CO2 conversion with a mass-specific activity (selectivity) of 3218 μmol·gCu-1·h-1 (97.3%). Spectroscopic analyses and density functional theory calculations revealed that CuNi HDAs with an asymmetric electronic distribution facilitated the activation of CO2 molecules and lowered the C-C coupling barrier energy, thus promoting the formation of *OCCHO intermediates. This, in turn, led to a significant enhancement of ethanol selectivity. Furthermore, with interfacial Cu-Ni-O bonds as a rapid electron transport channel, CuNi HDAs enrich enough electrons for 12-electron CO2 reduction, thereby enhancing ethanol productivity. This study provides a novel strategy for designing highly selective photocatalysts for CO2 conversion at the atomic scale.

Key words: CuNi heteronuclear diatoms, Photocatalysis, CO2-to-ethanol conversion, Asymmetric electronic distribution, Electron enrichment