Highly Stable Layered Coordination Polymer Electrocatalyst toward Efficient CO -to-CH Conversion.

Cu -based materials, a class of promising catalysts for the electrocatalytic carbon dioxide reduction reaction (CO RR) to value-added chemicals, usually undergo inevitable and uncontrollable reorganization processes during the reaction, resulting in catalyst deactivation or the new active sites formation and bringing great challenges to exploring their structure-performance relationships. Herein, a facile strategy is reported for constructing Cu and 3, 4-ethylenedioxythiophene (EDOT) coordination to stabilize Cu ions to prepare a novel layered coordination polymer (CuPEDOT). CuPEDOT enables selective reduction of CO to CH with 62.7% Faradaic efficiency at the current density of 354 mA cm in a flow cell, and the catalyst is stable for at least 15 h. In situ spectroscopic characterization and theoretical calculations reveal that CuPEDOT catalyst can maintain the Cu -EDOT coordination structurally stable in CO RR and significantly promote the further hydrogenation of *CO intermediates, favoring the formation of CH instead of dimerization to C products. The strong coordination between EDOT and Cu prevents the reduction of Cu ions during CO RR. The finding of this work provides a new perspective on designing molecularly stable, highly active catalysts for CO RR.