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Iron Porphyrins Embedded into a Supramolecular Porous Organic Cage for Electrochemical CO2 Reduction in Water.

  • Author(s): Smith, Peter T;
  • Benke, Bahiru Punja;
  • Cao, Zhi;
  • Kim, Younghoon;
  • Nichols, Eva M;
  • Kim, Kimoon;
  • Chang, Christopher J
  • et al.
Abstract

A porous organic cage composed of six iron tetraphenylporphyrins was used as a supramolecular catalyst for electrochemical CO2 -to-CO conversion. This strategy enhances active site exposure and substrate diffusion relative to the monomeric catalyst, resulting in CO generation with near-quantitative Faradaic efficiency in pH 7.3 water, with activities reaching 55 250 turnovers. These results provide a starting point for the design of supramolecular catalysts that can exploit the properties of the surrounding matrix yet retain the tunability of the original molecular unit.

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