Electroreduction of CO₂ (eCO₂RR) is a potentially sustainable approach for carbon‐based chemical production. Despite significant progress, performing eCO₂RR economically at scale is challenging. Here we report meeting key technoeconomic benchmarks simultaneously through electrolyte engineering and process optimization. A systematic flow electrolysis study ‐ performing eCO₂RR to CO on Ag nanoparticles as a function of electrolyte composition (cations, anions), electrolyte concentration, electrolyte flow rate, cathode catalyst loading, and CO₂ flow rate ‐ resulted in partial current densities of 417 and 866 mA/cm² with faradaic efficiencies of 100 and 98 % at cell potentials of −2.5 and −3.0 V with full cell energy efficiencies of 53 and 43 %, and a conversion per pass of 17 and 36 %, respectively, when using a CsOH‐based electrolyte. The cumulative insights of this study led to the formulation of system design rules for high rate, highly selective, and highly energy efficient eCO₂RR to CO.

中文翻译：

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用于在银纳米颗粒上增强CO2电化学还原为CO的系统设计规则

CO _2的电还原（eCO ₂ RR）是碳基化学生产的一种潜在可持续的方法。尽管取得了重大进展，但要在经济上大规模实施eCO ₂ RR仍然是一项挑战。在这里，我们报告通过电解质工程和工艺优化同时达到关键的技术经济基准。一项系统的流式电解研究-在Ag纳米颗粒上对e进行eCO ₂ RR对CO的变化，该变化与电解质成分（阳离子，阴离子），电解质浓度，电解质流速，阴极催化剂负载和CO ₂流速有关-导致了417和866 mA / cm ²当使用基于CsOH的电解质时，在-2.5和-3.0 V的电池电势下法拉第效率分别为100和98％，全电池能量效率分别为53和43％，单次转化率分别为17和36％。这项研究的累积见识导致制定了针对高速率，高选择性和高能效eCO ₂ RR的系统设计规则。