Issue 11, 2022

Hierarchical 3D porous carbon with facilely accessible Fe–N4 single-atom sites for Zn–air batteries

Abstract

Here, we report a highly efficient ORR electrocatalyst with Fe–N4 active sites uniformly dispersed on a three-dimensional (3D) interconnected porous nitrogen-doped carbon network synthesized by pyrolyzing SiO2@ZIF-8 composites loaded with iron salts. The as-prepared single-atom Fe 3D-ordered mesoporous carbon (SA-Fe-3DOMC) possesses a high specific surface area of 1357.8 m2 g−1 and a high Fe loading of 0.84 wt% as well. Benefiting from these favourable structural properties, SA-Fe-3DOMC exhibits a superior ORR half-wave potential (E1/2) of 0.901 V and negligible activity loss (only 3 mV) after 10 000 cycles in alkaline media, surpassing the state-of-the-art Pt/C electrocatalyst. Particularly, an integrated zinc–air battery with SA-Fe-3DOMC as the air electrode shows a remarkable peak power density (140 mW cm−2) and a high specific capacity (786.6 mA h g−1), demonstrating great potential for practical application.

Graphical abstract: Hierarchical 3D porous carbon with facilely accessible Fe–N4 single-atom sites for Zn–air batteries

Supplementary files

Article information

Article type
Communication
Submitted
18 Sep 2021
Accepted
09 Okt 2021
First published
14 Okt 2021

J. Mater. Chem. A, 2022,10, 5925-5929

Hierarchical 3D porous carbon with facilely accessible Fe–N4 single-atom sites for Zn–air batteries

P. Li, X. Qi, L. Zhao, J. Wang, M. Wang, M. Shao, J. S. Chen, R. Wu and Z. Wei, J. Mater. Chem. A, 2022, 10, 5925 DOI: 10.1039/D1TA08050D

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