A reversed gas diffusion electrode enables collection of high purity gas products from CO2 electroreduction†

EES catalysis Pub Date : 2025-01-14 DOI:10.1039/D4EY00253A
Bo Wu, Lakshmi Devi Voleti, Aidan Q. Fenwick, Chao Wu, Jiguang Zhang, Ning Ling, Meng Wang, Yuewen Jia, Weng Weei Tjiu, Mingsheng Zhang, Zainul Aabdin, Shibo Xi, Channamallikarjun S. Mathpati, Sui Zhang, Harry A. Atwater, Iftekhar A. Karimi and Yanwei Lum
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Abstract

Electrochemical CO2 reduction (CO2R) in conventional systems typically generates highly diluted product output streams. This necessitates energy intensive and costly product separation, which potentially decreases the feasibility and economic viability of the process. Here, we describe the design and fabrication of a reversed gas diffusion electrode, which makes use of electrolyte pressure to channel products toward a collection chamber. Importantly, this strategy successfully excludes CO2 and permits gas products to be siphoned off at high purity. We further show that the electrolyte pressure and gas diffusion layer pore size are the key factors which govern the product collection efficiency. Using a nanoporous Au catalyst, we showcase the continuous production of high purity syngas over an extended 76 h period, operating at a full-cell energy efficiency of 37%. Importantly, we also demonstrate that this system is oxygen-tolerant, with no parasitic loss of current towards the oxygen reduction reaction even with a 95% CO2 + 5% O2 gas feed. Taken together, our results introduce a new design approach for CO2R electrolyzer systems.

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