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Title: Electroreduction of CO 2 Catalyzed by a Heterogenized Zn–Porphyrin Complex with a Redox-Innocent Metal Center

Journal Article · · ACS Central Science

Transition-metal-based molecular complexes are a class of catalyst materials for electrochemical CO2 reduction to CO that can be rationally designed to deliver high catalytic performance. One common mechanistic feature of these electrocatalysts developed thus far is an electrogenerated reduced metal center associated with catalytic CO2 reduction. Here we report a heterogenized zinc–porphyrin complex (zinc(II) 5,10,15,20-tetramesitylporphyrin) as an electrocatalyst that delivers a turnover frequency as high as 14.4 site–1 s–1 and a Faradaic efficiency as high as 95% for CO2 electroreduction to CO at -1.7 V vs the standard hydrogen electrode in an organic/water mixed electrolyte. While the Zn center is critical to the observed catalysis, in situ and operando X-ray absorption spectroscopic studies reveal that it is redox-innocent throughout the potential range. Cyclic voltammetry indicates that the porphyrin ligand may act as a redox mediator. Chemical reduction of the zinc–porphyrin complex further confirms that the reduction is ligand-based and the reduced species can react with CO2. This represents the first example of a transition-metal complex for CO2 electroreduction catalysis with its metal center being redox-innocent under working conditions.

Research Organization:
Yale Univ., New Haven, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF); American Chemical Society Petroleum Research Fund; Institute of International Education (IIE); TomKat Foundation; Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division and Advanced Photon Source; Dupont Research and Development, Wilmington, DE (United States). DuPont Experimental Station; Northwestern Univ., Evanston, IL (United States); Oregon State Univ., Corvallis, OR (United States); Netherlands Organization for Scientific Research (NWO)
Grant/Contract Number:
FG02-07ER15909; CHE-1651717; AC02-06CH11357
OSTI ID:
1372709
Alternate ID(s):
OSTI ID: 1423563
Journal Information:
ACS Central Science, Vol. 3, Issue 8; ISSN 2374-7943
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 148 works
Citation information provided by
Web of Science

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Figures / Tables (5)