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Mesostructured Pt alloy nanotubes with synergistic edge sites as bifunctional electrocatalysts for direct ethanol fuel cells

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Energy Mater 2024;4:[Accepted].
10.20517/energymater.2024.136 | © The Author(s) 2025.
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Abstract

Direct ethanol fuel cells (DEFC) are regarded as indispensable and prospective energy storage devices due to their high volumetric energy density. Platinum (Pt) and Pt-based alloys are regarded as the most effective catalysts for both oxygen reduction reaction (ORR) and ethanol oxidation reaction (EOR). To further enhanced the catalytic performance of the catalyst, it's necessary to improve the mass activity and utilization efficiency of Pt. In this work, we report a strategy for fabricating ordered mesostructured platinum-palladium (PtPd) alloy nanotubes (MPPNs) with high hierarchical porosity (68%) and abundant exposed active edge sites. MPPNs exhibit excellent catalytic activity and stability for ORR, with a mass activity approximately 7.4 times higher than that of the commercial Pt/C catalyst. After 20k cycles of accelerated durability test for ORR, MPPNs exhibit an impressive retention of their original mass activity, maintaining a value of 93.9%. Furthermore, MPPNs display superior catalytic activity and stability for ethanol oxidation reaction, with a mass activity about 2.4 times higher than that of commercial Pt/C. After the 2000 scan cycles, the mass activity still remains 84.5% of initial performance. Both experimental and theoretical studies reveal that the synergistic effect of neighboring (111) and (100) facets on the edge sites plays a critical role in enhancing the electrocatalytic selectivity, activity and stability.

Keywords

Mesoporous PtPd nanotubes, ethanol oxidation reaction, oxygen reduction reaction, bifunctional electrocatalysts, edge sites

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Wang S, Zhao Z, Hu Y, Jiang S, Zhang X. Mesostructured Pt alloy nanotubes with synergistic edge sites as bifunctional electrocatalysts for direct ethanol fuel cells. Energy Mater 2024;4:[Accept]. http://dx.doi.org/10.20517/energymater.2024.136

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© The Author(s) 2025. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, sharing, adaptation, distribution and reproduction in any medium or format, for any purpose, even commercially, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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