A Stable and Conductive Metallophthalocyanine Framework for Electrocatalytic Carbon Dioxide Reduction in Water

: Transformation of carbon dioxide to high value-added chemicals becomes a significant challenge for clean energy study. Here we developed a stable and conductive covalent organic framework for electrocatalytic carbon dioxide reduction to carbon monoxide in aqueous solution. The cobalt(II) phthalocyanine catalysts are topologically connected via robust phenazine linkage into two-dimensional tetragonal framework that is stable under boiling water, acid, or base conditions. The 2D lattice enables full π conjugation along  x  and  y  directions well as π conduction along the  z  axis across the π columns. With these structural features, the electrocatalytic framework exhibits a farad a ic efficiency of 96%, an exceptional turnover number up to 320,000 and a long-term turnover frequency of 11,412 hour -1 , which is 32-fold increment compared to molecular catalyst. The combination of  catalytic  activity, selectivity, efficiency, and durability is desirable for clean energy production.