Induced CO<sub>2</sub> Electroreduction to Formic Acid on Metal−Organic Frameworks via Node Doping
Wenhao Geng, Wei Chen, Guihua Li, Xiao Dong, Yanfang Song, Wei Wei, Yuhan Sun
Abstract
Abstract Metal−organic frameworks (MOFs), combining the advantages of heterogeneous and homogeneous components, have been explored as catalytic materials for the CO 2 electroreduction reaction (CO 2 ERR). However, the unmatched metal nodes result in MOFs having lower faradaic efficiencies (FEs) and limited current densities in CO 2 ERR. Herein, we report a general strategy to promote activities of MOFs via node doping in CO 2 ERR. With ion exchange, an active tin node was doped into zeolitic imidazolate framework‐8 (ZIF‐8) to facilitate the reduction kinetics of CO 2 . The divalent Sn 2+ node accelerates the formation of formic acid (HCOOH), resulting in the highest HCOOH FE of 74 % and total current density ( J total ) of 27 mA/cm 2 at −1.1 V (vs. reversible hydrogen electrode, RHE) over 0.6 wt% Sn‐doped ZIF‐8 with stable catalytic performance after seven reuse cycles, which is clearly better compared to the catalytic properties of pristine ZIF‐8 (FE HCOOH =0 %, J total =13 mA/cm 2 ). This work opens an avenue for promoting the CO 2 ERR performance of MOFs by node doping.