Tan, Y. C., Quek, W. K., Kim, B., Sugiarto, S., Oh, J., & Kai, D. (2022). Pitfalls and Protocols: Evaluating Catalysts for CO2 Reduction in Electrolyzers Based on Gas Diffusion Electrodes. ACS Energy Letters, 7(6), 2012–2023. https://doi.org/10.1021/acsenergylett.2c00763
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.
This research / project is supported by the ASTAR - Career Development Award
Grant Reference no. : 202D800033
Acknowledge the financial support provided by the National Research Foundation of Korea (NRF-2021R1A2C3007280) and the “Carbon to X Project” (NRF-2020M3H7A1096388) through the National Research Foundation (NRF) of the Republic of Korea.