Development of platinum catalyst for lithium oxygen batteries by top-down lithography하향식 리소그래피를 이용한 리튬 공기 전지용 백금 촉매 개발에 관한 연구

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Lithium–oxygen ($Li–O_2$) batteries are attracting attention around the world as next generation batteries due to their very high energy density. However, there is a challenge that discharge/charge overpotential is large in practical application. In this work, as a cathode, the high monodisperse platinum hole-cylinder nanoparticles (Pt-HCNPs) fabricated by the top-down method dispersed on graphene nanoplatelets (GNP) enhanced the activity in both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), dramatically reducing the overpotential. During the discharge, amorphous $Li_2O_2$ with nanoflake morphology that facilitates formation and decomposition was found. This unique $Li_2O_2$ formation process is suggested as a cause of the reduction mechanism that occurs through the numerous catalytic active sites provided by hole-cylinder morphology and small grain size. These findings suggest a new strategy for the fabrication of catalysts for $Li-O_2$ batteries with high performance through a top-down method called secondary sputtering lithography.
Advisors
Jung, Hee-Taeresearcher정희태researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2020.8,[ii, 21 p. :]

Keywords

lithium oxygen battery▼aplatinum▼ahole-cylinder▼agrain▼acatalyst▼aamorphous $Li_2O_2$▼ananolithography; 리튬 공기 전지▼a백금▼a중공 기둥형▼a결정립▼a촉매▼a비정질 리튬 과산화물▼a나노리소그래피

URI
http://hdl.handle.net/10203/285100
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=925264&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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