Superstructured NiMoO4@CoMoO4 core-shell nanofibers for supercapacitors with ultrahigh areal capacitance

High areal capacitance for a practical supercapacitor electrode requires both large mass loading and high utilization efficiency of electroactive materials, which presents a great challenge. Herein, we demonstrated the unprecedented synthesis of superstructured NiMoO4@CoMoO4 core-shell nanofiber arr...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2023-03, Vol.120 (12), p.e2219950120-e2219950120
Main Authors: Chang, Liang, Chen, Shaoqin, Fei, Yuhuan, Stacchiola, Dario J, Hu, Yun Hang
Format: Article
Language:English
Subjects:
Capacitance
Electroactive materials
Electrochemistry
Electrodes
Metal foams
Molybdates
Nanofibers
Nickel
Nickel compounds
Physical Sciences
Supercapacitors
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Summary:High areal capacitance for a practical supercapacitor electrode requires both large mass loading and high utilization efficiency of electroactive materials, which presents a great challenge. Herein, we demonstrated the unprecedented synthesis of superstructured NiMoO4@CoMoO4 core-shell nanofiber arrays (NFAs) on a Mo-transition-layer-modified nickel foam (NF) current collector as a new material, achieving the synergistic combination of highly conductive CoMoO4 and electrochemical active NiMoO4. Moreover, this superstructured material exhibited a large gravimetric capacitance of 1,282.2 F/g in 2 M KOH with a mass loading of 7.8 mg/cm2, leading to an ultrahigh areal capacitance of 10.0 F/cm2 that is larger than any reported values of CoMoO4 and NiMoO4 electrodes. This work provides a strategic insight for rational design of electrodes with high areal capacitances for supercapacitors.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.2219950120