DC Field | Value | Language |
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dc.contributor.advisor | Park, Chan Beum | - |
dc.contributor.advisor | 박찬범 | - |
dc.contributor.author | Kuk, Su Keun | - |
dc.date.accessioned | 2019-08-25T02:41:33Z | - |
dc.date.available | 2019-08-25T02:41:33Z | - |
dc.date.issued | 2019 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=842154&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/264990 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 신소재공학과, 2019.2,[xiii, 143 p. :] | - |
dc.description.abstract | Biocatalytic $CO_2$ reduction is a promising route for sustainable $CO_2$ conversion because of exceptional chemoselectivity and stereospecificity as well as high yield at ambient conditions. Inspired by the Z-scheme photosynthesis scheme, the design strategies of photoelectrochemical platforms for efficient and sustainable biocatalytic $CO_2$ reduction are addressed. Chapter 1 demonstrates a tandem-photoelectrochemical (PEC)-cell-integrated-with-enzyme-cascade (TPIEC) system, which transfers photogenerated electrons to a multi-enzyme cascade for biocatalyzed reduction of $CO_2$ to methanol. A hematite photoanode and a bismuth ferrite photocathode were applied to fabricate the iron oxide-based tandem PEC cell for visible light-assisted regeneration of nicotinamide cofactor (NADH). To complete the TPIEC system, a superior three-dehydrogenase cascade system was employed in the cathodic part of the PEC cell. Using applied bias, the TPIEC system achieved high methanol conversion output using readily-available solar energy and water. Chapter 2 describes a strongly $CO_2$-reductive, cofactor-independent formate dehydrogenase from Clostridium ljungdahlii (ClFDH) and a $CO_2$-to-formate converting bioelectrode by immobilizing ClFDH on a conductive polyaniline (PANi) scaffold. The 3D-nanostructured PANi hydrogel facilitated efficient enzyme immobilization and rapid electron injection to the active site of ClFDH. The W-containing ClFDH in the hybrid electrode successfully gained electrons from PANi and exhibited high capability for electroenzymatic conversion of $CO_2$ to formate at low overvoltage without NADH. In Chapter 3, the design of a FDH-immobilized, direct electron transfer (DET)-type biocathode based on a continuous 3D structured TiN nanoshell (3D TiN) for $CO_2$-to-formate converting biocatalytic tandem PEC system is presented. The conductive 3D TiN possesses periodic porous networks with a large surface area and high porosity which are favorable for a large amount of enzyme loading and efficient DET to the adsorbed enzyme. At low overvoltage, the 3D TiN-ClFDH biocathode stably converted $CO_2$ into formate by DET with a high faradaic efficiency. Finally, 3D TiN-ClFDH biocathode was adopted to the $BiVO_4$/perovskite tandem PEC cell. The assembled biocatalytic tandem PEC cell exhibited solar-driven formate generation from $CO_2$ in ambient condition. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | 이산화탄소 환원▼a생체 촉매 작용▼a생체 촉매 연쇄반응▼a직접 전자 전달▼a광전기화학셀 | - |
dc.title | Design of photoelectrochemical platforms for biocatalytic carbon dioxide reduction | - |
dc.title.alternative | 생체촉매 기반 이산화탄소 환원을 위한 광전기화학 플랫폼 연구 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :신소재공학과, | - |
dc.contributor.alternativeauthor | 국수근 | - |
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