Development and analysis of novel functional materials for energy and gas storage applications = 에너지 저장 및 기체 포집을 위한 기능성 신재료 합성과 분석에 관한 연구

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For the last decade, the increasing carbon dioxide ($CO_2$) emission from burning fossil fuels has been regarded as one of the main origins for various energy and environmental issues. To resolve both grand challenges, the global $CO_2$ level decrease and efficient energy storage are essential as short- and long-term solutions, respectively. In this thesis, I cover the development and analysis of novel functional materials for energy and gas storage applications. In Chapter 2, restacking-inhibited 3D reduced graphene oxides were developed for electrical double layer capacitors (EDLCs), one of the energy storage systems (ESSs). Having noticed that the intercalated water molecules between graphene oxide interlayers play a critical role for the restacking of graphene sheets, in this study, these restacking phenomena were effectively mitigated by functionalizing the surface of graphene oxides, thus consequently, verifying the effect of restacking-inhibition on electrochemical performances. In Chapter 3, multicomponent transition metal (TM) oxides were synthesized and evaluated as pseudocapacitor electrodes. The roles of crystal defects, formed by solid-solution mixing of TMs, could be elucidated by the combined X-ray absorption fine structure (XAFS) analyses and density functional theory (DFT) calculations. In Chapter 4, TM-based $\alpha$ -layered double hydroxides (LDHs) were utilized as pseudocapacitor electrodes. While $\alpha$ -LDHs exhibited excellent electrochemical activities, mainly originating from its unique layered structures, they also possessed the vulnerable $\alpha -to- \beta$ phase transition, thus undergoing the severe capacity decay. Based on the crystal field theories, the solid solution mixing of binary TM ions is able to allow $\alpha$ -LDHs to possess the sustainable cycling performance without sacrificing the original high capacity. In Chapter 5, porous activated carbons from recycling coffee bean dreg were synthesized for dry $CO_2$ sorbents. Through the varied porosity condition, the dependence of the overall $CO_2$ capture performance (absolute uptake, isosteric heat of adsorption, $CO_2/N_2$ selectivity) on pore size was verified. In Chapter 6, the series of porous melamine resins with mesoscopic regularity were synthesized by a using the simple co-polymerization route. In this study, it was confirmed that the hydrogen bonding between resin monomers and surfactant molecules play a pivotal role for mesoscopic ordered structures. Based on this ordered mesoporous melamine resins, the general design principles for selective $CO_2$ captures over $N_2$ could be provided.
Advisors
Choi, Jang Wookresearcher최장욱researcher
Description
한국과학기술원 :EEWS대학원,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : EEWS대학원, 2017.2,[ix, 108 p. :]

Keywords

Energy Storage; Gas Storage; Material Design Principles; Crystal Field Theory; Hydrogen Bonding; Melamine Resin; Reduced Graphene Oxide; Activated Carbon; Transition Metal Oxides; Transition Metal Layered Double Hydroxides; 에너지 저장; 기체 포집; 재료 디자인 원리; 결정장 이론; 수소 결합; 멜라민 레진; 환원 그래핀; 활성탄; 전이금속 산화물; 전이금속 이중층 수산화물

URI
http://hdl.handle.net/10203/241613
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675602&flag=dissertation
Appears in Collection
EEW-Theses_Ph.D.(박사논문)
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