催化作用
电解
吸附
化学工程
碳纤维
无机化学
化学
材料科学
电极
有机化学
物理化学
电解质
复合数
工程类
复合材料
作者
Adnan Ozden,Jun Li,Sharath Kandambeth,Xiaoyan Li,Shijie Liu,Osama Shekhah,Pengfei Ou,Y. Zou Finfrock,Ya-Kun Wang,Tartela Alkayyali,F. Pelayo Garcı́a de Arquer,Vinayak S. Kale,Prashant M. Bhatt,Alexander H. Ip,Mohamed Eddaoudi,Edward H. Sargent,David Sinton
出处
期刊:Nature Energy
[Springer Nature]
日期:2023-01-12
卷期号:8 (2): 179-190
被引量:42
标识
DOI:10.1038/s41560-022-01188-2
摘要
Carbon dioxide/monoxide (CO2/CO) electrolysis provides a means to convert emissions into multicarbon products. However, impractical energy and carbon efficiencies limit current systems. Here we show that these inefficiencies originate from uncontrolled gas/ion distributions in the local reaction environment. Understanding of the flows of cations and anions motivated us to seek a route to block cation migration to the catalyst surface—a strategy we instantiate using a covalent organic framework (COF) in bulk heterojunction with a catalyst. The π-conjugated hydrophobic COFs constrain cation (potassium) diffusion via cation–π interactions, while promoting anion (hydroxide) and gaseous feedstock adsorption on the catalyst surface. As a result, a COF-mediated catalyst enables electrosynthesis of multicarbon products from CO for 200 h at a single-pass carbon efficiency of 95%, an energy efficiency of 40% and a current density of 240 mA cm−2. The carbon and energy efficiencies of current CO2/CO electrolysis systems are limited. Here the authors show that these metrics can be improved by controlling ion flows in the vicinity of a copper catalyst by the application of a covalent organic framework.
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