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Nickel Nanofoam/different Phases of Ordered Mesoporous Carbon Composite Electrodes for Superior Capacitive Energy Storage : 다양한 채널 형태에 따른 중형기공성 탄소/니켈 나노폼 전극의 전하 저장 능력에 관한 연구
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- Authors
- Advisor
- 차국헌
- Major
- 공과대학 화학생물공학부
- Issue Date
- 2018-02
- Publisher
- 서울대학교 대학원
- Keywords
- Ordered mesoporous carbon ; block copolymer self-assembly ; nickel nanofoam ; supercapacitor ; electric double-layer capacitance
- Description
- 학위논문 (석사)-- 서울대학교 대학원 : 공과대학 화학생물공학부, 2018. 2. 차국헌.
- Abstract
- Electrochemical energy storage devices based on electric double layer capacitors (EDLCs) have received considerable attention due to their high power density and potential for obtaining improved energy density in comparison to the lithium ion battery. Ordered mesoporous carbon (OMC) is a promising candidate for use as an EDLC electrode because it has a high specific surface area (SSA), providing a wider charge storage space and size-controllable mesopore structure with a long-range order, suppling highly accessibility to the electrolyte ions. However, OMCs fabricated using conventional methods have several drawbacks including low electronic conductivity and long ionic diffusion paths in mesopores. We used nickel nanofoam, which has a relatively small pore (sub-100 nm to sub-μm) network structure, as a current collector. This provides a significantly shortened electronic/ionic current paths and plentiful surface area, enabling stable and close attachment of OMCs without the use of binders. Thus, we present hierarchical binder-free electrode structures based on OMC/Ni nanofoams. These structures give rise to enhanced specific capacitance and a superior rate capability. We also investigated the mesopore structural effect of OMCs on electrolyte transport by comparing the capacitive performances of collapsed lamellar, cylindrical and spherical mesopore electrodes. The highly ordered and straightly aligned cylindrical OMCs exhibited the highest specific capacitance and the best rate capability.
- Language
- English
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