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고체 전해질 슈퍼 커패시터를위한 양극 전극으로서의 NiCo2O4 산화물의 제조에 관한 연구

Title
고체 전해질 슈퍼 커패시터를위한 양극 전극으로서의 NiCo2O4 산화물의 제조에 관한 연구
Other Titles
Preparation of Nickel Cobaltite on Nickel Foam as Anode Electrode for Solid-State Flexible Asymmetric Supercapacitor
Author
해서
Alternative Author(s)
XIE RUI
Advisor(s)
Erfan Zal Nezhad
Issue Date
2018-02
Publisher
한양대학교
Degree
Master
Abstract
The design and development of nanomaterial has become central to the advancement of pseudocapacitive performance. Many one-dimensional nanostructures, two-dimensional nanostructures, and three-dimensional hierarchical structures composed of these building blocks have been synthesized as supercapacitive materials by different methods. In this thesis, a facile two-step method is developed for large-scale growth of ultrathin mesoporous nickel cobaltite (NiCo2O4) nanosheet on conductive nickel (Ni) foam with robust adhesion as a high-performance electrode for electrochemical capacitors. The synthesis involves co-electrodeposition of a bimetallic nickel cobalt hydroxide precursor on a Ni foam support and a subsequent thermal transformation to spinel mesoporous NiCo2O4. The nickel-foam-supported ultrathin mesoporous NiCo2O4 nanosheets promise fast electron and ion transport, a large electroactive surface area, and excellent structural stability. As a result, the NiCo2O4 electrodeposited for one cycle exhibits a high specific capacitance of up to 1734.9 F g−1 at a current density of 2 A g−1, the sample retains approximately 87.3% of its maximum capacitance even after 3500 continuous charge–discharge cycles at a consistently high current density of 30 A g−1. Furthermore, a solid-state asymmetric supercapacitor (ASC) was assembled using carbon nanotubes as the negative electrode, NiCo2O4 nanosheet arrays as the positive electrode, and a polyvinyl alcohol–KOH gel as the solid-state electrolyte. The ASC shows superior electrochemical behavior and an energy density of 42.25 W h kg−1 at a power density of 298.79 W kg−1.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/68343http://hanyang.dcollection.net/common/orgView/200000432314
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > MECHANICAL CONVERGENCE ENGINEERING(융합기계공학과) > Theses (Master)
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