Iron porphyrin are known to reduce carbon dioxide to carbon monoxide in water in homogeneous and heterogenous state1-3. Iron and other metal porphyrins have been incorporated into covalent organic frameworks (COFs) and metallic organic framworks (MOFs) for carbon dioxide reduction and other catalytic reactions4-6. Most of COFs are synthesized and then drop-casted onto electrodes4, 6 while some COFs are formed in situ as thin film on electrode surface5. Reports have shown that single-layered two dimensional COFs systems have better catalytic performance than the corresponding thin film system7, 8. Hence, we aim to synthesized a single-layer COF (sCOF), which consist of synthesized iron porphyrin and organic struts linked through imine bonds, by the reported solid-vapor diffusion method9 on carbon electrodes. 10-4 M of THF solutions of 5,10,15,20-tetrakis(4-aminophenyl)porphinato]iron(III) chloride [Fe(TAPP)] with and without 2,5-dimethoxyterephthalaldehyde (DMA) or 2,5-dihydroxyterephthalaldehyde (DHA) are coated on carbon electrodes and air-dried, then the electrodes are heated at 130oC for 3 hours in Teflon autoclave. We compare the catalytic performance and physical properties of the FeTAPP and the FeTAPP-DMA/DHA COFs on different carbon electrodes. Catalytic activities of the COFs are studied by cyclic voltammetry, and controlled potential electrolysis at pH 7 in water. Fe(III/II) redox couple is observed at -0.5 V and catalytic potential is at -1.4V vs. NHE. UV-vis, and FTIR studies show the attachment of iron porphyrins on electrode surface. STM will be used to show the connectivity in the COFs.

Ultra thin layer of iron porphyrin COFs for CO2 reduction in water

255th National Meeting (2018)

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