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Covalent organic frameworks comprising cobalt porphyrins for catalytic CO2 reduction in water

Conversion of carbon dioxide to carbon monoxide 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 9400 hours-1) at pH 7 with an overpotential of –0.55 V, equivalent to a 60-fold improvement in activity compared to 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.

Published Online August 20 2015

Science DOI: 10.1126/science.aac8343

http://www.sciencemag.org/content/early/2015/08/19/science.aac8343.abstract#xref-corresp-1-1

发布日期:2015/08/24 发布者:网站管理员 点击数: