DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Il-Doo | - |
dc.contributor.advisor | 김일두 | - |
dc.contributor.author | Song, Seokwon | - |
dc.date.accessioned | 2019-09-03T02:45:18Z | - |
dc.date.available | 2019-09-03T02:45:18Z | - |
dc.date.issued | 2019 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843305&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/266433 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 신소재공학과, 2019.2,[v, 31 p. :] | - |
dc.description.abstract | The development of highly-efficient noble metal oxides and cost-effective transition metal oxides composite catalysts with superior stability could promote the practical applications of hydrogen energy from water electrolysis by improving the sluggish kinetics for oxygen evolution reaction (OER). Here, we report a unique three-dimensional (3D) hierarchical structures consisting of well-dispersed $IrO_x$ nanoparticles (NPs) with a sub-2 nm size encapsulated in numerous $Co_3O_4$ nanosheets (NSs) with a sub-15 nm thickness denoted as ICO NSs. The formation of ICO NSs was readily achieved by utilizing the metal encapsulation and morphology evolution capabilities of zeolitic imidazolate framework-67 (ZIF-67), which is a kind of metal-organic frameworks (MOFs), via ion-assistant solvothermal treatment with subsequent low-temperature calcination at 300 °C. The ICO NSs possesses high OER activity and excellent durability as compared with the commercial Ir/C even with the lower weight percentage of Ir content. The experimental results are contributed to the (i) formation of numerous exposed active sites and mesopores derived from morphology evolution and decomposition of organic linkers enabling faster charge transfers and intimate contact with electrolytes, (ii) phase transformation to $Co_3O_4$ including numerous active oxidation phase of $Co^{2+}$ induced by low-temperature calcination, and (iii) prevention of dissolution and detachment of $IrO_x$ NPs due to the surrounding passive $Co_3O_4$ NSs matrix. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | water electrolysis▼aoxygen evolution reaction▼aMOF template▼airidium oxide▼acobalt oxide | - |
dc.subject | 물 전기분해▼a산소 발생 반응▼a금속 유기 구조체 템플릿▼a이리듐 산화물▼a코발트 산화물 | - |
dc.title | Development of composite structures combining iridium oxide with cobalt oxide for highly efficient oxygen evolution reaction catalysts | - |
dc.title.alternative | 고효율 산소 발생 반응 촉매를 위한 이리듐 산화물과 코발트 산화물이 결합된 복합 구조의 개발에 관한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :신소재공학과, | - |
dc.contributor.alternativeauthor | 송석원 | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.