| Autor: |
Heßelmann, Matthias, Lee, Jason Keonhag, Chae, Sudong, Tricker, Andrew, Keller, Robert Gregor, Wessling, Matthias, Su, Ji, Kushner, Douglas, Weber, Adam Z., Peng, Xiong |
| Zdroj: |
ACS Applied Materials & Interfaces; May 2024, Vol. 16 Issue: 19 p24649-24659, 11p |
| Abstrakt: |
Coupling renewable electricity to reduce carbon dioxide (CO2) electrochemically into carbon feedstocks offers a promising pathway to produce chemical fuels sustainably. While there has been success in developing materials and theory for CO2reduction, the widespread deployment of CO2electrolyzers has been hindered by challenges in the reactor design and operational stability due to CO2crossover and (bi)carbonate salt precipitation. Herein, we design asymmetrical bipolar membranes assembled into a zero-gap CO2electrolyzer fed with pure water, solving both challenges. By investigating and optimizing the anion-exchange-layer thickness, cathode differential pressure, and cell temperature, the forward-bias bipolar membrane CO2electrolyzer achieves a CO faradic efficiency over 80% with a partial current density over 200 mA cm–2at less than 3.0 V with negligible CO2crossover. In addition, this electrolyzer achieves 0.61 and 2.1 mV h–1decay rates at 150 and 300 mA cm–2for 200 and 100 h, respectively. Postmortem analysis indicates that the deterioration of catalyst/polymer–electrolyte interfaces resulted from catalyst structural change, and ionomer degradation at reductive potential shows the decay mechanism. All these results point to the future research direction and show a promising pathway to deploy CO2electrolyzers at scale for industrial applications. |
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