Constructing Fe–N-doped porous carbon nanofibers for a pH-universal ORR and switchable, superior Zn–air batteries

文献情報

出版日 2023-11-29

DOI 10.1039/D3TA06537E

インパクトファクター 12.732

著者

Yuhan Xiao, Yanfeng Ge, Degong Gao, Yunge Zhang, Zepeng Li

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要旨

Mechanically stable air cathodes with exceptional oxygen reduction reaction (ORR) activities serve as a highly significant component of metal–air batteries. Herein, we have proposed and prepared a porous air electrode consisting of well-dispersed Fe nanoparticles (Zn assisted formation) embedded in nitrogen-rich 3D carbon nanofibers (called Fe(Zn)–N–C) derived from Fe, Zn–metal–organic frameworks (MOFs) by a facile and scalable approach. The obtained Fe(Zn)–N–C with a distinctly continuous porous structure presented a comparable or even better performance than the commercial 20 wt% Pt/C and previously reported non-noble electrocatalysts for Zn–air batteries, which includes (1) effective in the universal-pH range (E1/2 = 0.86, 0.74, and 0.67 V in alkaline, acidic, and neutral media, respectively), (2) extremely high stability (∼85%, 80%, and 82% activity retention for 86 400 s in alkaline, acidic, and neutral media, respectively), (3) a high power density (193 and 48 mW cm−2 in alkaline and neutral media, respectively), and (4) an excellent specific capacity (800 and 688 mA h g−1 in alkaline and neutral media, respectively). This design strategy of porous non-precious metal-doped pH-universal ORR electrocatalysts could also be extended to fabricate other novel, stable, and easy-to-use multi-functional electrocatalysts for clean-energy technology.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

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