Energy- and carbon-efficient CO2/CO electrolysis to multicarbon products via asymmetric ion migration–adsorption

Adnan Ozden, Jun Li*, Sharath Kandambeth, Xiao Yan Li, Shijie Liu, Osama Shekhah, Pengfei Ou, Y. Zou Finfrock, Ya Kun Wang, Tartela Alkayyali, F. Pelayo García de Arquer, Vinayak S. Kale, Prashant M. Bhatt, Alexander H. Ip, Mohamed Eddaoudi*, Edward H. Sargent*, David Sinton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)179-190
Number of pages12
JournalNature Energy
Volume8
Issue number2
DOIs
StatePublished - Feb 2023

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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