Integrated Electrochemical Carbon Capture and Utilization by Redox‐Active Amine Grafted Gold Nanoparticles
Tao Yan, Shuo Liu, Zhikun Liu, Jie Sun, Peng Kang
Abstract
Abstract Electrochemical carbon capture and utilization (eCCU) from flue gas CO 2 could avoid high energy consumption and capital input in conventional capture, storage, and utilization, which is a promising approach for achieving negative emissions and producing “e‐chemicals.” However, low CO 2 concentration and leftover O 2 in the flue gas presumably lowers the eCCU performance. Herein, redox‐active 2‐amino‐5‐mercapto‐1,3,4‐thiadiazole (AMT) functionalized gold nanoparticles are synthesized to achieve integrated electrochemical capture and reduction of CO 2 in simulated flue gas (SFG, 15% CO 2 , 4% O 2 , balanced with N 2 ), achieving maximum CO Faradaic efficiency of 80.2% at −0.45 V versus RHE in H‐type cell, and 66.0% at voltage of 2.7 V in a full cell, respectively. The AMT ligand can capture CO 2 by strong interaction with CO 2 in the reduced state and serve as a selective layer to suppress O 2 reduction, which provides the ability of electrochemical carbon capture from SFG and significantly decreases energy required for CO 2 electro‐reduction.