We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Regulating the Coordination Environment of MOF‐Templated Single‐Atom Nickel Electrocatalysts for Boosting CO<sub>2</sub> Reduction.
- Authors
Gong, Yun‐Nan; Jiao, Long; Qian, Yunyang; Pan, Chun‐Yang; Zheng, Lirong; Cai, Xuechao; Liu, Bo; Yu, Shu‐Hong; Jiang, Hai‐Long
- Abstract
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.
- Subjects
ELECTROLYTIC reduction; ELECTROCATALYSTS; CARBON dioxide reduction; NICKEL; TEMPERATURE control; METAL-organic frameworks; ACTIVITY-based costing; ATOMS
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 7, p2727
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201914977