Nanoporous $Pt_xNi_{1-x}$ thin films fabricated by dealloying for a low-temperature solid oxide fuel cell cathode = 선택적 부식에 의한 저온 작동 고체산화물연료전지용 다공성 백금-니켈 박막 공기극 개발에 관한 연구

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Thin-film based, low-temperature solid oxide fuel cells (LT-SOFCs) have been considered as an alternative power source for portable electronic devices because they can tap the high energy densities of hydrocarbon fuels and are readily recharged. Pt has been widely used as a cathode material given its high electronic conductivity and excellent oxygen reduction reaction (ORR) activity. Pt electrode has a highly porous and continuously connected Pt structure, serving as a gas permeable and electronic conducting layer, as well as an electrocatalyst. The common strategy for fabricating such a porous Pt structure is based on sacrificial template technique, Ostwald ripening, reactive sputtering. However, these methods have disadvantage such as difficult and time consuming to manufacture or require post-annealing. Here, we address this issue through the application of a selective dissolution method, known as dealloying. This simple and cost-effective method enables fabricate a nanoporous sponge-like structure without pre-annealing process. Nanoporous Pt-Ni thin films deposited onto an YSZ electrolyte were obtained by co-sputtering of Pt and Ni targets, followed by the subsequent electrochemical etching of Ni species. The obtained films are characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray Fluorescence Spectrometer (XRF) and energy dispersive spectroscopy (EDS). AC impedance spectroscopy (ACIS) of symmetric cells (cathode; electrolyte; cathode) demonstrates the critical role of nano-pores in achieving satisfactory LT-SOFCs cathode activity and stability.
Advisors
Jung, WooChulresearcher정우철researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2017.2,[v, 57 p. :]

Keywords

solid oxide fuel cells; cathode; Pt; co-sputtering; electrochemical etching; dealloying; AC impedance spectroscopy; 고체산화물연료전지; 공기극; 백금; 동시-스퍼터링; 전기화학적 에칭; 선택적 부식; 교류 임피던스 분광법

URI
http://hdl.handle.net/10203/243159
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675288&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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