Tri-(Fe/F/N)-doped porous carbons as electrocatalysts for the oxygen reduction reaction in both alkaline and acidic media

Developing a low cost, sustainable and high-performance precious-metal free catalyst to replace platinum (Pt)-based catalysts for the oxygen reduction reaction (ORR) in fuel cells has recently attracted significant attention. It is crucial to produce more abundant and more uniformly dispersed ORR ac...

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Bibliographic Details
Published in:Nanoscale 2020-09, Vol.12 (36), p.18826-18833
Main Authors: Diao, Yongxing, Liu, Hanmeng, Yao, Zhixia, Liu, Yaosheng, Hu, Guangxing, Zhang, Qifang, Li, Zhuang
Format: Article
Language:English
Subjects:
Catalysts
Chemical synthesis
Dispersion
Electrocatalysts
Fuel cells
Metal-organic frameworks
Oxygen reduction reactions
Platinum
Structural hierarchy
Zeolites
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Summary:Developing a low cost, sustainable and high-performance precious-metal free catalyst to replace platinum (Pt)-based catalysts for the oxygen reduction reaction (ORR) in fuel cells has recently attracted significant attention. It is crucial to produce more abundant and more uniformly dispersed ORR active sites for improving the ORR performance of the catalyst. Herein, we synthesized tri-(Fe/F/N)-doped porous carbons as high-efficiency electrocatalysts for the ORR by using Fe-zeolitic imidazolate framework-8 (Fe-ZIF-8) and ammonium fluoride as precursors. The results indicate that the as-prepared FeFNC-5 catalysts exhibit superior ORR activity, methanol tolerance, and long-term stability compared to commercial 20 wt% Pt/C in both alkaline and acidic media because of the abundant and dispersed Fe-N x and pyridinic-N active sites, high specific surface area, and hierarchical porous structure. This work provides a new method and insights into the synthesis of Fe, F, and N triple-doped porous carbons as high-efficiency ORR electrocatalysts. The uniformly dispersed Fe-N x and the increased defects after F doping make tri-(Fe/F/N)-doped porous carbons electrocatalysts have superior ORR performance than Pt/C in both alkaline and acidic media.
ISSN:2040-3364
2040-3372
DOI:10.1039/d0nr04920d