Cathode of Zn-Ni Layered Double Hydroxide Nanosheet Arrays Wrapped with a Porous NiMoSxShell and Anode of 3D Hierarchical Nitrogen-Doped Carbon for High-Performance Asymmetric Supercapacitors
- Authors
- Lee, Myeong Hun; Bandyopadhyay, Parthasarathi; Jin, En Mei; Baasanjav, Erdenebayar; Kang, Dong-Won; Jeong, Sang Mun
- Issue Date
- Sep-2021
- Publisher
- American Chemical Society
- Keywords
- asymmetric supercapacitors; core@shell structure; energy density; hierarchical; specific capacity
- Citation
- ACS Applied Energy Materials, v.4, no.9, pp 9166 - 9177
- Pages
- 12
- Journal Title
- ACS Applied Energy Materials
- Volume
- 4
- Number
- 9
- Start Page
- 9166
- End Page
- 9177
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/51235
- DOI
- 10.1021/acsaem.1c01412
- ISSN
- 2574-0962
- Abstract
- The rational design and synthesis of multicomponent core@shell structures with fine morphology is a promising approach to develop electrode materials for advanced supercapacitors. In this study, Zn-Ni LDH@NiMoSx nanosheets with a hierarchical heterostructure are grown in situ on nickel foam through the hydrothermal routes, for the potential use as an integrated positive electrode material. The Zn-Ni LDH@NiMoSx shows a unique morphology and mesoporous feature with excellent synergistic effects between individual components. Compared to the single components of Zn-Ni LDH and NiMoSx, the Zn-Ni LDH@NiMoSx nanosheet arrays show better specific capacity (357.88 mA h g-1 at a current of 5 mA cm-2) and rate performance. Meanwhile, ZIF-8 derived 3D nanoporous N-doped carbon (ZPNC) material is used as an negative electrode material with high surface area (918.3 m2 g-1), excellent capacity (52.42 mA h g-1 at 2 mA cm-2), and rate performance (∼55% at 50 mA cm-2). The asymmetric supercapacitor device based on Zn-Ni LDH@NiMoSx and ZPNC electrodes exhibits a specific capacity of 73.18 mA h g-1 at 3.5 mA cm-2 and an excellent cycle lifespan of 90% after 6000 cycles. The device also demonstrates excellent energy density (58.54 W h kg-1) and very high power density (7397.34 W kg-1). © 2021 American Chemical Society.
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