A membrane electrode assembly-type cell designed for selective CO production from bicarbonate electrolyte and air containing CO2 mixed gas

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Abstract

The electrochemical CO2 reduction reaction (CO2RR) combined with direct air capture (DAC) based CO2 is a promising method for terrestrial carbon cycling. In this study, we have designed an all-Ag cathode and constructed a membrane electrode assembly (MEA) cell to utilize CO2 capture solution, which can be produced by flowing air containing CO2 mixed gas into an alkaline solution. A MEA consisting of a Ag nanoparticle catalyst sprayed on a Nafion membrane and a Ag electrode were used to construct a MEA cell (Ag MEA-cell). The Ag MEA-cell exhibited selective CO production without severe side reactions, such as the hydrogen evolution reaction, even when an aqueous electrolyte was used. The operation of the Ag MEA-cell using CO2 capture solution, which was prepared by bubbling 60% air containing CO2 mixed gas (40% CO2 and 60% air, air-CO2) into 1 M KOH, achieved CO production with 86% faradaic efficiency (FECO). Furthermore, the Ag MEA-cell significantly suppressed O2 reduction and achieved FECO of 74% even when air-CO2 was used as a CO2 source.

Original languageEnglish
Pages (from-to)778-783
Number of pages6
JournalEnergy Advances
Volume3
Issue number4
DOIs
Publication statusPublished - Mar 20 2024

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)

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