Deriving highly-enhanced mass activity of electrochemical catalyst for oxygen evolution reaction with stack of ordered Iridium nanowire arrays = 정렬된 이리듐 나노와이어를 쌓아 올린 박막 촉매의 높은 활성 확인 및 원인 규명

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Selecting highly efficient catalyst for oxygen evolution reaction in acidic electrolytes is a challenge for producing environmentally friendly hydrogen with highly compactable and efficient polymer electrolyte membrane water electrolysis(PEMWE). Here, we suggest a woodpile-nanostructured Ir thin film, fabricated by stacking periodically-arrayed nanowires through solvent-assisted nanotransfer printing, exhibiting exceptional enhancement of mass activity and stability. The woodpile nanostructure enables complete utilization of iridium in the catalyst from top to bottom because ordered and interconnected pores with size of meso (~50nm) and macro(>200 nm) pores have propensity to flood. Low tortuosity of the pores within the woodpile structure facilitates dioxygen product to escape the catalyst layer. These characteristics are related to increase of the surface area of the interface between the catalyst and the water reactant and the quantity of the reaction per unit area per unit time. These properties result woodpile-nanostructured Ir thin film to show 4.8 times advanced mass activity relative to a conventional nanoparticle-type iridium catalyst. In addition, it sustains 80% of activity after 500 start/stop cycles in contrast to 60% sustainability of the nanoparticles. Furthermore, we demonstrated ~36 times enhancement of mass activity in real PEMWE device. The woodpile nanostructured Ir thin film are meant to guide further research to improve orderability of stacking nanowire array for optimized electrochemical OER catalyst.
Advisors
Jung, Yeon Sikresearcher정연식researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2019.2,[iv, 41 p. :]

Keywords

PEMWE; OER catalyst; Iridium▼amass activity▼apropensity to flood▼amass transport▼awoodpile-structured thin film; 수전해조▼a산소발생반응 촉매▼a이리듐▼a표면적▼a고유 활성▼a장작더미모양 미세 구조

URI
http://hdl.handle.net/10203/266513
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=867968&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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