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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