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 language | English |
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Pages (from-to) | 778-783 |
Number of pages | 6 |
Journal | Energy Advances |
Volume | 3 |
Issue number | 4 |
DOIs | |
Publication status | Published - Mar 20 2024 |
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology
- Energy (miscellaneous)