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Al-doping driven electronic structure of α-NiS hollow spheres modified by rGO as high-rate electrode for quasi-solid-state capacitor.
- Source :
-
Ceramics International . Dec2022, Vol. 48 Issue 24, p36021-36028. 8p. - Publication Year :
- 2022
-
Abstract
- Developing an optimized electronic structure of α-NiS electrode material is critical for its high-rate electrochemical performance of quasi-solid-state capacitor. Herein, Al3+ have been doped into α-NiS lattice and the reduced graphene oxide (rGO) is employed to modify Al-doping α-NiS, to alleviate the low-mobility charge of α-NiS. The electronic structure and electrochemical properties of α-NiS hollow spheres induced by Al-doping and rGO modification are investigated, both experimental characterization and theoretical results confirm Al-doping affect the electronic structure and electrochemical performance of α-NiS hollow spheres. In the composite of Al-doping α-NiS and rGO (named as Al x Ni 1-x S/rGO), the doped heteroatom improves the intrinsic electronic structure of α-NiS and the rGO provides a good electric conducting network, leading to an enhanced electrochemical performance of α-NiS as high-rate electrode material. After evaluation, the optimized Al 0.2 Ni 0.8 S/rGO composite shows a superior reversible capacity of 1096 C g−1 at 2 A g−1, and retains a capability of 471 C g−1 at a high-rate of 30 A g−1. Moreover, an asymmetric quasi-solid-state hybrid capacitors assembled by Al 0.2 Ni 0.8 S/rGO and activated carbon presents a high energy density of 30.6 Wh kg−1. This work provides a foundational strategy for the modification of α-NiS through Al-doping and combining with rGO, which has a positive effect on α-NiS electrode material in quasi-solid-state hybrid capacitors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 48
- Issue :
- 24
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 160213709
- Full Text :
- https://doi.org/10.1016/j.ceramint.2022.07.292