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

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 hol...

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Bibliographic Details
Published in:Materials chemistry frontiers 2022-07, Vol.6 (14), p.1938-1947
Main Authors: Tu, Chengyu, Li, Xuan, Lu, Congcong, Luo, Qiao, Li, Tie, Zhu, Maiyong
Format: Article
Language:English
Subjects:
Activated carbon
Clean energy
Durability
Electrochemical analysis
Electrodes
Energy sources
Energy storage
Iron oxides
Manganese dioxide
Nanospheres
Supercapacitors
Synthesis
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Summary: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.
ISSN:2052-1537
DOI:10.1039/d2qm00450j