دورية أكاديمية
Preferential Protection of Low Coordinated Sites in Pt Nanoparticles for Enhancing Durability of Pt/C Catalyst
| العنوان: | Preferential Protection of Low Coordinated Sites in Pt Nanoparticles for Enhancing Durability of Pt/C Catalyst |
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| المؤلفون: | Dong Wook Lee, Seongmin Yuk, Sungyu Choi, Dong-Hyun Lee, Gisu Doo, Jonghyun Hyun, Jiyun Kwen, Jun Young Kim, Hee-Tak Kim |
| المصدر: | Energies, Vol 14, Iss 5, p 1419 (2021) |
| بيانات النشر: | MDPI AG, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Technology |
| مصطلحات موضوعية: | low coordinated site, preferential protection, Pt dissolution, durability, polymer electrolyte membrane fuel cell, Technology |
| الوصف: | Protecting low coordinated sites (LCS) of Pt nanoparticles, which are vulnerable to dissolution, may be an ideal solution for enhancing the durability of polymer electrolyte fuel cells (PEMFCs). However, the selective protection of LCSs without deactivating the other sites presents a key challenge. Herein, we report the preferential protection of LCSs with a thiol derivative having a silane functional group, (3-mercaptopropyl) triethoxysilane (MPTES). MPTES preferentially adsorbs on the LCSs and is converted to a silica framework, providing robust masking of the LCSs. With the preferential protection, the initial oxygen reduction reaction (ORR) activity is marginally reduced by 8% in spite of the initial electrochemical surface area (ECSA) loss of 30%. The protected Pt/C catalyst shows an ECSA loss of 5.6% and an ORR half-wave potential loss of 5 mV after 30,000 voltage cycles between 0.6 and 1.0 V, corresponding to a 6.7- and 2.6-fold durability improvement compared to unprotected Pt/C, respectively. The preferential protection of the vulnerable LCSs provides a practical solution for PEMFC stability due to its simplicity and high efficacy. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 14051419 1996-1073 |
| Relation: | https://www.mdpi.com/1996-1073/14/5/1419; https://doaj.org/toc/1996-1073 |
| DOI: | 10.3390/en14051419 |
| URL الوصول: | https://doaj.org/article/664beb3daf0d40688be0b202e4081657 |
| رقم الأكسشن: | edsdoj.664beb3daf0d40688be0b202e4081657 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 14051419 19961073 |
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| DOI: | 10.3390/en14051419 |