Fabrication of composite nanostructures using block copolymer self-assembly and their applications in energy devices블록 공중합체 자기 조립을 이용한 복합 나노구조체 제작 및 에너지 소자 응용

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The capability to engineer materials in nanometer scales has brought unprecedented technological advancements in various fields. Energy storage devices, in particular, have demonstrated significant improvements in their performances derived from superior capabilities of nanostructured electrodes, but systematic control of the nanomaterials remains a challenge. This dissertation discusses fabrication of highly controlled, bicontinuous composite nanostructures using block copolymer self-assembly and their evaluations as electrode materials in energy applications. Three-dimensionally arranged block copolymers were utilized as the structure-directing frameworks to produce highly porous and interconnected carbonaceous structures. The bottom-up fabrication process allowed versatile control of the nanostructures with high degrees of freedom in the structure dimensions, morphologies, and compositions. In Chapter 2, supercapacitor electrodes were prepared with integration of phenolic resin to the polymer network to produce heteroatom-doped carbon nanostructures. Their structural dimensions were controlled to facilitate the electrolyte accessibility and diffusion within the electrode nanostructures, which lead to superior performances. In Chapter 3, electrocatalyst materials were fabricated with incorporation of platinum precursors to develop composite nanostructures of platinum particles embedded in carbon matrix. Morphology control of the composite structure enhanced the catalytic activity and durability of the noble metal particles. In Chapter 4, various carbon-metal nanostructures were prepared with diverse noble metal nanoparticles, and multi-metallic carbon composites were demonstrated by simultaneously introducing multiple noble metal precursors to the polymer framework. Overall, the nanofabrication process discussed in this thesis provides a simple yet versatile approach in producing well-defined nanostructures with controlled dimensions, morphologies, and compositions, and the electrochemical evaluations suggest novel perspectives in design and fabrication of electrode nanostructures.
Advisors
Jung, Yeon Sikresearcher정연식researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2021
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2021.2,[iv, 121 p. :]

Keywords

Three-dimensional nanostructure▼aBlock copolymer▼aSelf-assembly▼aComposite material▼aSupercapacitor▼aElectrocatalyst; 3차원 나노구조체▼a블록공중합체▼a자기 조립▼a복합 재료▼a슈퍼커패시터▼a전기화학촉매

URI
http://hdl.handle.net/10203/295534
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=956755&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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