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

Abstract

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.

Authors:
 [1];  [1];  [1];  [2];  [3];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States; Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, United States
  2. School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
  3. Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
Publication Date:
Research Org.:
Yale Univ., New Haven, CT (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & 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)
OSTI Identifier:
1397287
DOE Contract Number:  
FG02-07ER15909; CHE-1651717; AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Central Science; Journal Volume: 3; Journal Issue: 8
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Wu, Yueshen, Jiang, Jianbing, Weng, Zhe, Wang, Maoyu, Broere, Daniël L. J., Zhong, Yiren, Brudvig, Gary W., Feng, Zhenxing, and Wang, Hailiang. Electroreduction of CO 2 Catalyzed by a Heterogenized Zn–Porphyrin Complex with a Redox-Innocent Metal Center. United States: N. p., 2017. Web. doi:10.1021/acscentsci.7b00160.
Wu, Yueshen, Jiang, Jianbing, Weng, Zhe, Wang, Maoyu, Broere, Daniël L. J., Zhong, Yiren, Brudvig, Gary W., Feng, Zhenxing, & Wang, Hailiang. Electroreduction of CO 2 Catalyzed by a Heterogenized Zn–Porphyrin Complex with a Redox-Innocent Metal Center. United States. doi:10.1021/acscentsci.7b00160.
Wu, Yueshen, Jiang, Jianbing, Weng, Zhe, Wang, Maoyu, Broere, Daniël L. J., Zhong, Yiren, Brudvig, Gary W., Feng, Zhenxing, and Wang, Hailiang. Wed . "Electroreduction of CO 2 Catalyzed by a Heterogenized Zn–Porphyrin Complex with a Redox-Innocent Metal Center". United States. doi:10.1021/acscentsci.7b00160.
@article{osti_1397287,
title = {Electroreduction of CO 2 Catalyzed by a Heterogenized Zn–Porphyrin Complex with a Redox-Innocent Metal Center},
author = {Wu, Yueshen and Jiang, Jianbing and Weng, Zhe and Wang, Maoyu and Broere, Daniël L. J. and Zhong, Yiren and Brudvig, Gary W. and Feng, Zhenxing and Wang, Hailiang},
abstractNote = {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.},
doi = {10.1021/acscentsci.7b00160},
journal = {ACS Central Science},
number = 8,
volume = 3,
place = {United States},
year = {Wed Jul 26 00:00:00 EDT 2017},
month = {Wed Jul 26 00:00:00 EDT 2017}
}