Enhancing Electrochemical Reduction of CO_2 to Formate by Regulating the Support Morphology

Electroreduction of CO_2 to formic acid has attracted extensive attention,because it is a promising strategy to re-utilize CO_2 and reduce greenhouse gas emissions that may favor the mitigation of energy and environment issues.Although great efforts have been made to tune the structure and composition of catalysts aiming to improve CO_2 conversion efficiency,seldom studies have been focused on the support regulation.In this work,ordered,porous TiO_2 nanotube arrays have been used as model support to study the impact of pore structure for CO_2 electrochemical reduction.It has been revealed that Pd supported on TiO_2 nanotube arrays substrate exhibits enhanced performance towards CO_2 reduction,showing a higher formate Faradaic efficiency of 20%over than Pd supported on TiO_2 film substrate.This study will shed new light on the design and synthesis of efficient catalysts by tuning the morphology of support for CO_2 conversion.