Design of organic materials for nature-inspired photochemical and electrical energy storage자연모방형 광화학 및 전기적 에너지 저장 유기소재 연구

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Energy storage technologies have attracted great attention as global demand for energy is increasing rapidly. This thesis describes the design strategies of organic materials using bio-inspired peptides and single organic molecules for photochemical and electrical energy storage. Chapter 1 report the synthesis of self-assembled, insulin-based amyloid nanofibrils that are hybridized with light-responsive dyes (i.e., thioflavin-T, ThT) to mimic natural photosystems. The work presents the potential of self-assembled amyloid nanofibrils as a light-harvesting scaffold for visible light driven NADH regeneration with a biocatalytic module for enzymatic reduction reaction in colloidal system. Chapter 2 demonstrates visible-light driven regeneration of nicotinamide adenine dinucleotide (NAD+) using solvatochromic Congo red (CR) hybridized with an amyloid-derived peptide (Fmoc-FF) hydrogel system. This study adds a new dimension to the research on self-assembled amyloid materials for biocatalytic oxidized photochemical storage. Chapter 3 unveils that the proton-coupled redox reaction of a single organic molecule in an aqueous solution can be translated to the lithium-coupled redox reaction of a single organic molecule in a lithium-based organic electrolyte by using phenoxazin-3-one (i.e., resorufin) as a new bio-inspired redox active molecule. The phenoxazin-3-one cathode delivered a high discharge capacity (298 mAh g-1) and fast rate capability (65% capacity retention at 10 C). The result provides insight into the design of a new class of bio-inspired organic electrode materials. Chapter 4 presents the self-reinforced inductive effect in the symmetric bipolar QA derivative, N,N'-dimethylquinacridone (DMQA), which enables outstanding battery performance in the lithium-ion rechargeable battery system. DMQA, the symmetric bipolar organic molecule, exhibited the excellent battery performance. Excellent capacity retention is achieved at the average voltage of 3.85 V (vs. Li+/Li) and 1.68 V (vs. Li+/Li) during both p- and n-type reaction, which are suitable to work as the cathode and anode of the batteries, respectively. This chapter provides a new insight about energy storage capability of symmetric bipolar organic molecule and its self-reinforced inductive effect.
Advisors
Park, Chan Beumresearcher박찬범researcher
Description
한국과학기술원 :신소재공학과,
Country
한국과학기술원
Issue Date
2021
Identifier
325007
Language
eng
Article Type
Thesis(Ph.D)
URI
http://hdl.handle.net/10203/294710
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=962531&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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