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Luo et al. Microstructures 2023;3:2023011 https://dx.doi.org/10.20517/microstructures.2022.41 Page 11 of 13

CONCLUSIONS
In conclusion, hollow Ni N-Co N /NC nanoflower was synthesized by pyrolyzing nickel/cobalt-TEOA
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complex precursor using urea as the nitrogen source and applied as positive electrode material for
supercapacitor. Thanks to the remarkable electronic conductivity originating from metal nitrides and
N-doped carbon and copious active sites provided by self-assembled nanosheets and porous structure, the
Ni N-Co N /NC exhibits appreciable electrochemical performance. In a three-electrode system, the
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Ni N-Co N /NC delivers a high specific capacitance of 1582 F g at 1 A g and excellent cycle stability
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(83.79% after 5000 cycles at 10 A g ). Additionally, when fabricated as Ni N-Co N /NC//AC ASC device, it
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displays a favorable energy density of 32.4 W h Kg at a power density of 851.3 W Kg and outstanding
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capacitance retention (95.8% after 5000 cycles at 10 A g ). This work may create ideas to prepare metal
nitride-based nanomaterials using nontoxic nitrogen source and pave the way for the rational design of
hollow inorganic materials/carbon composites with high performance for SCs.
DECLARATIONS
Authors’ contributions
Designed the study and supervised the overall project: Zhu M
Performed the experiments, collected data, and drafted the manuscript: Luo Q
Contributed to the result discussion: Luo Q, Lu C, Liu L, Zhu M
Availability of data and materials
Not applicable.
Financial support and sponsorship
The authors acknowledge the financial support from the Nation Natural Science Foundation of China
(21403091).

Conflicts of interest
All authors declared that there are no conflicts of interest.

Ethical approval and consent to participate
Not applicable.

Consent for publication
Not applicable.

Copyright
© The Author(s) 2023.

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