التفاصيل البيبلوغرافية
| العنوان: |
Instantaneous Free Radical Scavenging by CeO2 Nanoparticles Adjacent to the Fe−N4 Active Sites for Durable Fuel Cells. |
| المؤلفون: |
Cheng, Xiaoyang1 (AUTHOR), Jiang, Xiaotian1 (AUTHOR), Yin, Shuhu1 (AUTHOR), Ji, Lifei1 (AUTHOR), Yan, Yani1 (AUTHOR), Li, Guang1 (AUTHOR), Huang, Rui1 (AUTHOR), Wang, Chongtai2 (AUTHOR), Liao, Honggang1 (AUTHOR), Jiang, Yanxia1 (AUTHOR) yxjiang@xmu.edu.cn, Sun, Shigang1 (AUTHOR) sgsun@xmu.edu.cn |
| المصدر: |
Angewandte Chemie International Edition. 8/21/2023, Vol. 62 Issue 34, p1-9. 9p. |
| مصطلحات موضوعية: |
*FREE radicals, *FUEL cells, *PROTON exchange membrane fuel cells |
| مستخلص: |
To achieve the Fe−N−C materials with both high activity and durability in proton exchange membrane fuel cells, the attack of free radicals on Fe−N4 sites must be overcome. Herein, we report a strategy to effectively eliminate radicals at the source to mitigate the degradation by anchoring CeO2 nanoparticles as radicals scavengers adjacent (Scaad‐CeO2) to the Fe−N4 sites. Radicals such as ⋅OH and HO2⋅ that form at Fe−N4 sites can be instantaneously eliminated by adjacent CeO2, which shortens the survival time of radicals and the regional space of their damage. As a result, the CeO2 scavengers in Fe−NC/Scaad‐CeO2 achieved ∼80 % elimination of the radicals generated at the Fe−N4 sites. A fuel cell prepared with the Fe−NC/Scaad‐CeO2 showed a smaller peak power density decay after 30,000 cycles determined with US DOE PGM‐relevant AST, increasing the decay of Fe−NCPhen from 69 % to 28 % decay. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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