The evaluation of catalysts on gas diffusion electrodes (GDEs) have propelled the progress of electrochemical CO₂ reduction reaction (CO₂RR) at industry-relevant activities. However, high experimental complexities exist in GDE-based flow electrolyzers, whereby various experimental factors can influence the evaluation of catalytic CO₂RR performances. Not accounting for these experimental factors could result in inconsistent conclusions and thus hinder rational catalyst developments. This Perspective highlights a range of experimental factors that can affect the performance metrics for electrocatalysts. Specifically, the product faradaic efficiency can be influenced by the overestimation of the effluent gas flow rate, unaccounted losses of products, and unintended alteration of microenvironments. In addition, cathodic voltage can be inaccurately determined due to the unaccounted dynamic changes in uncompensated resistance. By raising awareness of these potential pitfalls and establishing appropriate protocols, we foresee a more meaningful benchmarking of catalytic performances across the literature.

中文翻译：

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陷阱和协议：基于气体扩散电极评估用于减少电解槽中 CO2 的催化剂

气体扩散电极 (GDE) 催化剂的评估推动了电化学 CO ₂还原反应 (CO ₂ RR) 在工业相关活动中的进展。然而，基于 GDE 的流式电解槽中存在很高的实验复杂性，因此各种实验因素会影响催化 CO _2的评估RR 表演。不考虑这些实验因素可能会导致结论不一致，从而阻碍合理的催化剂开发。该观点重点介绍了一系列可能影响电催化剂性能指标的实验因素。具体来说，产品法拉第效率可能受到高估废气流速、产品损失不明和微环境意外改变的影响。此外，由于未补偿电阻中未考虑的动态变化，可能无法准确地确定阴极电压。通过提高对这些潜在陷阱的认识并建立适当的协议，我们预见到文献中催化性能的更有意义的基准测试。