Mixed-metal Ionothermal Synthesis of Metallophthalocyanine Covalent Organic Frameworks for CO2 Capture and Conversion |
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Authors: | Dr Kyung Seob Song Patrick W Fritz Dr Daniel F Abbott Lok Nga Poon Cristiano M Caridade Dr Felipe Gándara Prof?Dr Victor Mougel Prof?Dr Ali Coskun |
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Institution: | 1. Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland;2. Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1–5, 8093 Zürich, Switzerland;3. Department of New Architectures in Materials Chemistry, Materials Science Institute of Madrid–CSIC, Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain |
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Abstract: | Phthalocyanines (PCs) are intriguing building blocks owing to their stability, physicochemical and catalytic properties. Although PC-based polymers have been reported before, many suffer from relatively low stability, crystallinity, and low surface areas. Utilizing a mixed-metal salt ionothermal approach, we report the synthesis of a series of metallophthalocyanine-based covalent organic frameworks (COFs) starting from 1,2,4,5-tetracyanobenzene and 2,3,6,7-tetracyanoanthracene to form the corresponding COFs named M-pPPCs and M-anPPCs, respectively. The obtained COFs followed the Irving–Williams series in their metal contents, surface areas, and pore volume and featured excellent CO2 uptake capacities up to 7.6 mmol g?1 at 273 K, 1.1 bar. We also investigated the growth of the Co-pPPC and Co-anPPC on a highly conductive carbon nanofiber and demonstrated their high catalytic activity in the electrochemical CO2 reduction, which showed Faradaic efficiencies towards CO up to 74 % at ?0.64 V vs. RHE. |
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Keywords: | CO2 Capture Covalent Organic Frameworks Electrocatalysis Ionothermal Synthesis Phthalocyanine |
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