Acid-humidified CO <sub>2</sub> gas input for stable electrochemical CO <sub>2</sub> reduction reaction
(Bi)carbonate salt formation has been widely recognized as a primary factor in poor operational stability of the electrochemical carbon dioxide reduction reaction (CO<sub>2</sub>RR). We demonstrate that flowing CO<sub>2</sub> gas into an acid bubbler-which carries trace amounts of acid vapor into a gas diffusion electrode for silver-catalyzed CO<sub>2</sub>RR to carbon monoxide (CO)-can prevent salt accumulation. In a 100-square-centimeter, scaled-up CO<sub>2</sub>RR membrane electrode assembly electrolyzer with single serpentine flow channels, the acid humidification method achieved the 4500 hours of stability milestone at 100 mA cm<sup>-2</sup> without compromising the CO faradaic efficiency, whereas a conventional water-humidified CO<sub>2</sub> feed only operated stably for ~80 hours. The acid-humidified CO<sub>2</sub> approach was extended to bismuth, copper, and zinc catalysts.
Authors
- Yuge Feng (ORCID: https://orcid.org/0000-0003-0093-6717)
- Feng-Yang Chen (ORCID: https://orcid.org/0000-0002-3113-383X)
- Peng Zhu (ORCID: https://orcid.org/0000-0002-8855-0335)
- Shaoyun Hao (ORCID: https://orcid.org/0000-0001-8353-518X)
- Shou-Kun Zhang (ORCID: https://orcid.org/0000-0003-3936-973X)
- Ahmad Elgazzar (ORCID: https://orcid.org/0000-0003-1453-4938)
- Tae‐Ung Wi (ORCID: https://orcid.org/0000-0002-8295-825X)
- Haotian Wang (ORCID: https://orcid.org/0000-0002-3552-8978)
Institutions
- Rice University (US)
Publication Details
- Journal
- Science
- Published
- 2025-06-12
- DOI
- https://doi.org/10.1126/science.adr3834
- Citations
- 76
- Primary Topic
- CO2 Reduction Techniques and Catalysts
- Type
- article
- Field-Weighted Citation Impact
- 27.62