Selective Zero-Gap CO2 Reduction in Acid,ACS Energy Letters

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Selective Zero-Gap CO2 Reduction in Acid
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-09-13 , DOI: 10.1021/acsenergylett.4c01410
Tae Hyeon Ha ₁ , Jaehoon Kim ₁ , Hyeonuk Choi ₁ , Jihun Oh ₁

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The electrochemical CO₂ reduction reaction (CO₂RR) is a promising method of converting CO₂ into valuable chemicals and fuels, thereby contributing to carbon neutrality. This study explores the CO₂RR under acidic conditions using a zero-gap electrolyzer, which minimizes ohmic losses by optimizing the electrode proximity. We assessed the performance of the CO₂RR using a Ni single-atom catalyst, a porous diaphragm, and various ion-exchange membranes. Our findings show that the porous diaphragm enhances the CO Faraday efficiency (FE) and prevents salt formation, which are crucial for maintaining high selectivity and system durability. Comparative analyses demonstrate that, while traditional ion-exchange membranes can be faced with considerable salt buildup and/or reduced CO FE, the implementation of a zero-gap electrolyzer with a porous diaphragm offers a robust solution, enabling higher efficiency and stability, even at increased current densities. These developments can help optimize CO₂ electrolyzer technologies and enhance their operational and economic viability.

中文翻译：

酸中选择性零间隙二氧化碳还原

电化学CO ₂还原反应(CO ₂ RR)是将CO ₂转化为有价值的化学品和燃料的一种有前途的方法，从而有助于碳中和。本研究使用零间隙电解槽探索酸性条件下的 CO ₂ RR，该电解槽通过优化电极接近度来最大限度地减少欧姆损耗。我们使用 Ni 单原子催化剂、多孔隔膜和各种离子交换膜评估了 CO ₂ RR 的性能。我们的研究结果表明，多孔隔膜提高了 CO 法拉第效率 (FE) 并防止盐形成，这对于保持高选择性和系统耐用性至关重要。比较分析表明，虽然传统的离子交换膜可能面临大量盐堆积和/或 CO FE 降低的问题，但采用多孔隔膜的零间隙电解槽提供了可靠的解决方案，即使在增加电流密度。这些发展有助于优化CO ₂电解槽技术并提高其运营和经济可行性。

更新日期：2024-09-13

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