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Xie, Ke; Miao, Rui Kai; Ozden, Adnan; Liu, Shijie; Chen, Zhu; Dinh, Cao-Thang; Huang, Jianan Erick; Xu, Qiucheng; Gabardo, Christine M.; Lee, Geonhui; Edwards, Jonathan P.; O’Brien, Colin P.; Boettcher, Shannon W.; Sinton, David; Sargent, Edward H.
Nature communications, 06/2022, Letnik: 13, Številka: 1Journal Article
Abstract In alkaline and neutral MEA CO 2 electrolyzers, CO 2 rapidly converts to (bi)carbonate, imposing a significant energy penalty arising from separating CO 2 from the anode gas outlets. Here we report a CO 2 electrolyzer uses a bipolar membrane (BPM) to convert (bi)carbonate back to CO 2 , preventing crossover; and that surpasses the single-pass utilization (SPU) limit (25% for multi-carbon products, C 2+ ) suffered by previous neutral-media electrolyzers. We employ a stationary unbuffered catholyte layer between BPM and cathode to promote C 2+ products while ensuring that (bi)carbonate is converted back, in situ, to CO 2 near the cathode. We develop a model that enables the design of the catholyte layer, finding that limiting the diffusion path length of reverted CO 2 to ~10 μm balances the CO 2 diffusion flux with the regeneration rate. We report a single-pass CO 2 utilization of 78%, which lowers the energy associated with downstream separation of CO 2 by 10× compared with past systems.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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