Design of group 10 (Pd, Pt) bimetallic nanoparticles and application toward next generation energy storage = 10족 (Pd, Pt) 이중금속 나노입자의 디자인 및 차세대 에너지 저장체 응용 연구

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Nanoparticles (NPs) have received considerable attention because of their unique magnetic, optical, and electronic properties which are different from the properties in the bulk state. Among the metal NPs, plat-inum group metals (PGMs) have been widely used as catalysts. PGM catalysts are exclusive in regard of ac-tivity and selectivity toward numerous hydrogenation and oxidation reactions, and they exhibit a high stability in extreme reaction conditions. These catalysts are considered as promising candidates for not only synthetic chemistry but also next generation energy storage systems, such as fuel cells and Li-air batteries. However, their practical uses are limited by high cost and scarcity. Recently, many researchers have studied on the improvement of catalytic performance by controlling the composition and morphology of NPs to maximize the activity and strengthen the durability with the reducing of the amount of PGMs. In this study, we desire to synthesize bimetallic catalysts employing either platinum (Pt) or palladium (Pd) metals and apply them to efficient catalysts in fuel cells and Li-air batteries. We have synthesized well-defined Pd-Pt core-shell NPs with controlled shell thickness and employed them for the application toward oxygen reduction reaction (ORR) of polymer-exchange-membrane fuel cells (PEMFCs). In addition, we have prepared PdCu bimetallic NPs with mixed crystalline phase (face-centered cubic (fcc) and B2-type structure), which were employed as catalysts for ORR and oxygen evolution reaction (OER) in Li-air batteries. In chapter 2, we report a designed synthesis of well-defined Pd@Pt core-shell NPs with a controlled Pt shell thickness of 0.4-1.2 nm via a facile wet chemical method and their electrocatalytic performances for ORR as a function of shell-thickness. Pd@Pt NPs with pre-determined structural parameters were prepared via the in situ heteroepitaxial growth of Pt on as-synthesized 6 nm Pd NPs without any sacrificial layers n...
Advisors
Song, Hyun-Joonresearcher송현준
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2013
Identifier
566083/325007  / 020088063
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학과, 2013.8, [ viii, 102 p. ]

Keywords

Pt; 리튬-에어 전지; 연료전지; 이중금속; 팔라듐; 백금; Pd; bimetallic catalysts; fuel cells; Li-air batteries

URI
http://hdl.handle.net/10203/196486
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=566083&flag=dissertation
Appears in Collection
CH-Theses_Ph.D.(박사논문)
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