Science· 2015Q1
Covalent organic frameworks comprising cobalt porphyrins for catalytic CO <sub>2</sub> reduction in water
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- Q1SCImago
- 2015year
Short summary
A modularly optimized covalent organic framework (COF) featuring cobalt porphyrin catalysts linked by imine bonds achieved 90% Faradaic efficiency for electrochemical CO2 reduction to CO in water at pH 7, with a 26-fold activity improvement over molecular complexes.
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Key points
- Developed a modularly optimized covalent organic framework (COF) with cobalt porphyrin catalysts for CO2 reduction.
- Achieved 90% Faradaic efficiency for electrochemical CO2 to CO conversion in water at pH 7.
- Catalyst exhibited high turnover numbers (up to 290,000) and initial turnover frequency (9400 hour-1) at -0.55 V overpotential.
- Showed a 26-fold activity improvement over molecular cobalt complexes with no degradation over 24 hours.
AI-generated from the title and abstract; the full text is not read.
Abstract
Conversion of carbon dioxide (CO2) to carbon monoxide (CO) and other value-added carbon products is an important challenge for clean energy research. Here we report modular optimization of covalent organic frameworks (COFs), in which the building units are cobalt porphyrin catalysts linked by organic struts through imine bonds, to prepare a catalytic material for aqueous electrochemical reduction of CO2 to CO. The catalysts exhibit high Faradaic efficiency (90%) and turnover numbers (up to 290,000, with initial turnover frequency of 9400 hour(-1)) at pH 7 with an overpotential of -0.55 volts, equivalent to a 26-fold improvement in activity compared with the molecular cobalt complex, with no degradation over 24 hours. X-ray absorption data reveal the influence of the COF environment on the electronic structure of the catalytic cobalt centers.
The authors' abstract, as published at the source. Science, 2015 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy