Abstract：
Electrochemical CO2 reduction reaction (CO2RR) powered by renewable energy provides a promising route to CO2 conversion and utilization. However, the widely used neutral/alkaline electrolyte consumes a large amount of CO2 to produce (bi)carbonate byproducts, leading to significant challenges at the device level, thereby impeding the further deployment of this reaction. Conducting CO2RR in acidic electrolytes offers a promising solution to address the \"carbonate issue\"; however, it presents inherent difficulties due to the competitive hydrogen evolution reaction, necessitating concerted efforts toward advanced catalyst and electrode designs to achieve high selectivity and activity. This review encompasses recent developments of acidic CO2RR, from mechanism elucidation to catalyst design and device engineering. This review begins by discussing the mechanistic understanding of the reaction pathway, laying the foundation for catalyst design in acidic CO2RR. Subsequently, an in-depth analysis of recent advancements in acidic CO2RR catalysts is provided, highlighting heterogeneous catalysts, surface immobilized molecular catalysts, and catalyst surface enhancement. Furthermore, the progress made in device-level applications is summarized, aiming to develop high-performance acidic CO2RR systems. Finally, the existing challenges and future directions in the design of acidic CO2RR catalysts are outlined, emphasizing the need for improved selectivity, activity, stability, and scalability.
摘要：
由可再生能源驱动的电化学CO2还原反应（CO2RR）为CO2的转化和利用提供了有希望的途径。然而,广泛使用的中性/碱性电解质消耗大量的CO2来产生（双）碳酸酯副产物，导致设备级别的重大挑战，从而阻碍了该反应的进一步展开。在酸性电解质中进行CO2RR为解决“碳酸盐问题”提供了有希望的解决方案；但是，由于竞争性的析氢反应，它存在固有的困难，需要对先进的催化剂和电极设计进行协同努力以实现高选择性和活性。这篇综述涵盖了酸性CO2RR的最新进展，从机理阐明到催化剂设计和装置工程。我们首先讨论对反应途径的机械理解，为酸性CO2RR催化剂设计奠定基础。随后，我们对酸性CO2RR催化剂的最新进展进行了深入分析，突出非均相催化剂，表面固定化分子催化剂和催化剂表面增强。此外，我们总结了设备级应用的进展，旨在开发高性能酸性CO2RR系统。最后,我们概述了酸性CO2RR催化剂设计中的现有挑战和未来方向，强调需要改进选择性，活动,稳定性,和可扩展性。本文受版权保护。保留所有权利。
