Abstract
Solid-state ionic conductor is a vital part in all electrochemical energy conversion devices. As a widely-applied proton-conducting polymer and stabilizer for electrode preparation, Nafion has key applications in electrochemical devices operated under acidic conditions. Specific adsorption of Nafion on the catalyst surface is considered to result in partial loss of intrinsic activity in reactions such as oxygen reduction reaction (ORR), due to its comprehensive occupation of active sites. Many in situ characterization methods such as voltammetric fingerprinting and spectroscopic approaches have been used to explore the dynamic adsorption of Nafion on the electrode surface. However, most of current efforts have been focused on the behaviors of Nafion itself, with little attention paid to its effects on the adsorption of surface intermediates. Here, we employed the in situ electrical transport spectroscopy (ETS) to investigate Nafion adsorption on Pt catalysts and its effects on the ORR intermediates. Our findings suggest that specific adsorption of Nafion results in the increased coverage of oxygen intermediates with weaker adsorption strength, which in turn plays a critical role in the reaction selectivity. The successful application of ETS on the dynamic characterization of reaction intermediates provides a novel perspective for catalyst design in ORR-related applications in future sustainable chemistry.
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Acknowledgements
This work was supported by the Natural Science Foundation of China (22172075 and 92156024), the Fundamental Research Funds for the Central Universities in China (14380273), Natural Science Foundation of Jiangsu Province (BK20220069), Beijing National Laboratory for Molecular Sciences (BNLMS202107), and the Thousand Talents Plan of Jiangxi Province (jxsq2019102002).
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Unravelling the critical role of surface Nafion adsorption in Pt-catalyzed oxygen reduction reaction by in situ electrical transport spectroscopy
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Sun, Y., Tian, J., Mu, Z. et al. Unravelling the critical role of surface Nafion adsorption in Pt-catalyzed oxygen reduction reaction by in situ electrical transport spectroscopy. Sci. China Chem. 65, 2290–2298 (2022). https://doi.org/10.1007/s11426-022-1428-6
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DOI: https://doi.org/10.1007/s11426-022-1428-6