Issue 5, 2021

A high-energy-density supercapacitor with multi-shelled nickel–manganese selenide hollow spheres as cathode and double-shell nickel–iron selenide hollow spheres as anode electrodes

Abstract

Thanks to the attractive structural characteristics and unique physicochemical properties, mixed metal selenides (MMSes) can be considered as encouraging electrode materials for energy storage devices. Herein, a straightforward and efficient approach is used to construct multi-shelled nickel–manganese selenide hollow spheres (MSNMSeHSs) as cathode and double-shell nickel–iron selenide hollow spheres (DSNFSeHSs) as anode electrode materials by tuning shell numbers for supercapacitors. The as-designed MSNMSeHS electrode can deliver a splendid capacity of ∼339.2 mA h g−1/1221.1 C g−1, impressive rate performances of 78.8%, and considerable longevity of 95.7%. The considerable performance is also observed for the DSNFSeHS electrode with a capacity of 258.4 mA h g−1/930.25 C g−1, rate performance of 75.5%, and longevity of 90.9%. An efficient asymmetric apparatus (MSNMSeHS||DSNFSeHS) fabricated by these two electrodes depicts the excellent electrochemical features (energy density of ≈112.6 W h kg−1 at 900.8 W kg−1) with desirable longevity of ≈94.4%.

Graphical abstract: A high-energy-density supercapacitor with multi-shelled nickel–manganese selenide hollow spheres as cathode and double-shell nickel–iron selenide hollow spheres as anode electrodes

Supplementary files

Article information

Article type
Paper
Submitted
18 11 2020
Accepted
30 12 2020
First published
30 12 2020

Nanoscale, 2021,13, 2931-2945

A high-energy-density supercapacitor with multi-shelled nickel–manganese selenide hollow spheres as cathode and double-shell nickel–iron selenide hollow spheres as anode electrodes

A. Mohammadi Zardkhoshoui, B. Ameri and S. S. Hosseiny Davarani, Nanoscale, 2021, 13, 2931 DOI: 10.1039/D0NR08234A

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