Underevaluated Solvent Effects in Electrocatalytic CO2 Reduction by FeIII Chloride Tetrakis(pentafluorophenyl)porphyrin |
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Authors: | Bin Zhao Dr Haitao Lei Ni Wang Gelun Xu Prof?Dr Wei Zhang Prof?Dr Rui Cao |
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Institution: | Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China |
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Abstract: | FeIII chloride tetrakis(pentafluorophenyl)porphyrin ( 1 ) is known to have poor electrocatalytic activity for the CO2-to-CO conversion in dimethylformamide. In this work, we re-examined Fe porphyrin 1 as a CO2 reduction catalyst in various solvents. Our results show that 1 displays fairly high electrocatalytic CO2-to-CO activity in acetonitrile with a turnover frequency (TOF) up to 4.2×104 s?1. On the other hand, 1 shows a modest activity in propylene carbonate, and is inefficient to catalyze CO2 reduction in benzonitrile, dimethylformamide, and tetrahydrofuran. Several solvent effects were considered, but none of these effects alone can explain the observed large activity difference of 1 for CO2 reduction in these solvents. Based on the results, it is suggested that more care should be paid when comparing different CO2 reduction catalysts because solvent effects are significant and are underevaluated. |
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Keywords: | CO2 reduction CO2-to-CO conversion electrocatalysis Fe porphyrin solvent effect |
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