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Reduction of CO2 to CO at Low Overpotential in Neutral Aqueous Solution by a Ni(cyclam) Complex Attached to Poly(allylamine)

Authors

  • Dr. Duraisamy Saravanakumar,

    1. Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology and Inorganic Biological Materials Center of BK21, Sogang University, Seoul 121-742 (South Korea)
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  • Dr. Jieun Song,

    1. Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology and Inorganic Biological Materials Center of BK21, Sogang University, Seoul 121-742 (South Korea)
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  • Nayoung Jung,

    1. Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology and Inorganic Biological Materials Center of BK21, Sogang University, Seoul 121-742 (South Korea)
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  • Harishchandra Jirimali,

    1. Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology and Inorganic Biological Materials Center of BK21, Sogang University, Seoul 121-742 (South Korea)
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  • Prof. Dr. Woonsup Shin

    Corresponding author
    1. Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology and Inorganic Biological Materials Center of BK21, Sogang University, Seoul 121-742 (South Korea)
    • Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology and Inorganic Biological Materials Center of BK21, Sogang University, Seoul 121-742 (South Korea)
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Abstract

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Less is more: Nickel cyclam complexes are known as efficient catalysts for the electrochemical reduction of CO2 to CO, despite having overvoltages of more than 0.6 V. Incorporating [Ni(cyclam)]2+ into poly(allylamine) through axial coordination of pyridine enables the electrochemical reduction of CO2 to CO near the thermodynamic potential of −0.78 V (vs. Ag/AgCl) at pH 8 with a current efficiency of 90 %.

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