التفاصيل البيبلوغرافية
| العنوان: |
Regulating the Coordination Environment of MOF‐Templated Single‐Atom Nickel Electrocatalysts for Boosting CO2 Reduction. |
| المؤلفون: |
Gong, Yun‐Nan, Jiao, Long, Qian, Yunyang, Pan, Chun‐Yang, Zheng, Lirong, Cai, Xuechao, Liu, Bo, Yu, Shu‐Hong, Jiang, Hai‐Long |
| المصدر: |
Angewandte Chemie International Edition; 2/10/2020, Vol. 59 Issue 7, p2705-2709, 5p |
| مصطلحات موضوعية: |
ELECTROLYTIC reduction, ELECTROCATALYSTS, METAL-organic frameworks, NICKEL, TEMPERATURE control, ACTIVITY-based costing, CATALYSTS |
| مستخلص: |
The general synthesis and control of the coordination environment of single‐atom catalysts (SACs) remains a great challenge. Herein, a general host–guest cooperative protection strategy has been developed to construct SACs by introducing polypyrrole (PPy) into a bimetallic metal–organic framework. As an example, the introduction of Mg2+ in MgNi‐MOF‐74 extends the distance between adjacent Ni atoms; the PPy guests serve as N source to stabilize the isolated Ni atoms during pyrolysis. As a result, a series of single‐atom Ni catalysts (named NiSA‐Nx‐C) with different N coordination numbers have been fabricated by controlling the pyrolysis temperature. Significantly, the NiSA‐N2‐C catalyst, with the lowest N coordination number, achieves high CO Faradaic efficiency (98 %) and turnover frequency (1622 h−1), far superior to those of NiSA‐N3‐C and NiSA‐N4‐C, in electrocatalytic CO2 reduction. Theoretical calculations reveal that the low N coordination number of single‐atom Ni sites in NiSA‐N2‐C is favorable to the formation of COOH* intermediate and thus accounts for its superior activity. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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