| Autor: |
O’Brien, Colin P., McLaughlin, David, Böhm, Thomas, Xiao, Yurou Celine, Edwards, Jonathan P., Gabardo, Christine M., Bierling, Markus, Wicks, Joshua, Sedighian Rasouli, Armin, Abed, Jehad, Young, Daniel, Dinh, Cao-Thang, Sargent, Edward H., Thiele, Simon, Sinton, David |
| Zdroj: |
Joule; October 2024, Vol. 8 Issue: 10 p2903-2919, 17p |
| Abstrakt: |
Electrocatalytic CO2reduction offers a means to produce value-added multi-carbon products and mitigate CO2emissions. However, the stability of CO2electrolyzers for C2+products has not exceeded 200 h—well below that of CO- and H2-producing electrolyzers—and the most stable systems employ low-conductivity substrates incompatible with scale. Current gas diffusion electrodes (GDEs) become filled with salt precipitate and electrolyte, which limits CO2availability at the catalyst beyond 30 h. We develop a GDE architecture that is resistant to flooding and maintains stable performance for >400 h. Using a combination of focused ion beam scanning electron microscopy, micro-computed tomography, and a purpose-built array tomography technique, we determine that the enhanced stability is due to a percolating network of polytetrafluoroethylene in the microporous layer that retains hydrophobicity. We scale this approach in an 800 cm2cell and an 8,000 cm2stack and transfer >108C, the largest reported CO2electrolysis demonstration. |
| Databáze: |
Supplemental Index |
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