Enhanced Electrochemical Reduction of CO <sub>2</sub> to CO upon Immobilization onto Carbon Nanotubes Using an Iron‐Porphyrin Dimer
Maryam Abdinejad, Caitlin Dao, Billy Deng, Maegan E. Sweeney, Fabian Dielmann, Xiao‐an Zhang, Heinz‐Bernhard Kraatz
Abstract
Abstract Electrochemical reduction of carbon dioxide (CO 2 ) is a viable solution for conversion of atmospheric CO 2 to value‐added materials such as carbon monoxide (CO). In this project, a new urea iron‐tetraphenylporphyrin‐dimer (Fe‐TPP‐Dimer) was synthesized and applied for electrocatalytic CO 2 reduction under both homogeneous and heterogeneous conditions to selectively reduce CO 2 to CO. Immobilization of the catalyst onto carbon nanotubes (CNTs) in aqueous solution resulted in remarkable enhancement of its electrocatalytic abilities, with exceptional turnover frequencies (10 s −1 ), high faradic efficiency (FE) of ∼90%, and a current density of 16 mA/cm 2 at −0.88 V vs. RHE. This project exhibits the importance of molecular design in accessing heterogeneous applications with CNTs.