Issue 14, 2022

A sequential process to synthesize Fe3O4@MnO2 hollow nanospheres for high performance supercapacitors

Abstract

Designing efficient, durable, and affordable electrodes for supercapacitors is indispensable for utilizing clean and renewable energy resources. Herein, a three-step sequential process, including two hydrothermal procedures followed by an etching treatment, was developed to synthesize Fe3O4@MnO2 hollow nanospheres (Fe3O4@MnO2-HNS) using solid silica as a hard template. Fe3O4@MnO2-HNS has the largest specific surface area (121.99 m2 g−1) due to a double hollow structure compared to other samples. The as-prepared Fe3O4@MnO2-HNS exhibited superior electrochemical performance as compared to pristine hollow nanospheres of either Fe3O4 or MnO2. When applied to practical asymmetric supercapacitor devices (Fe3O4@MnO2-HNS as a positive electrode and activated carbon (AC) as a negative electrode), Fe3O4@MnO2-HNS//AC exhibited prominent performance, such as a high capacity of 168.81 C g−1 (375.14 F g−1) at 0.5 A g−1, a large energy density of 15.84 W h kg−1 at a power density of 803 W kg−1, and an excellent stable charge–discharge durability of 70.6% over 5000 cycles at 2 A g−1. We envision that Fe3O4@MnO2-HNS may be a promising alternative for applications in energy storage and electrocatalysis where discrete electrochemical performances are desired.

Graphical abstract: A sequential process to synthesize Fe3O4@MnO2 hollow nanospheres for high performance supercapacitors

Supplementary files

Article information

Article type
Research Article
Submitted
15 may 2022
Accepted
25 may 2022
First published
26 may 2022

Mater. Chem. Front., 2022,6, 1938-1947

A sequential process to synthesize Fe3O4@MnO2 hollow nanospheres for high performance supercapacitors

C. Tu, X. Li, C. Lu, Q. Luo, T. Li and M. Zhu, Mater. Chem. Front., 2022, 6, 1938 DOI: 10.1039/D2QM00450J

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