dc.citation.conferencePlace |
KO |
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dc.citation.conferencePlace |
광주, GIST |
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dc.citation.title |
18th Topical Meeting of the International Society of Electrochemistry |
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dc.contributor.author |
Kim, Ho Young |
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dc.contributor.author |
Sa, Young Jin |
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dc.contributor.author |
Yim, Sung Dae |
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dc.contributor.author |
Joo, Sang Hoon |
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dc.date.accessioned |
2023-12-19T21:08:12Z |
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dc.date.available |
2023-12-19T21:08:12Z |
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dc.date.created |
2017-01-08 |
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dc.date.issued |
2016-03-09 |
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dc.description.abstract |
Improving the activity and durability of the cathode catalyst in proton exchange membrane fuel cells (PEMFCs) is of great importance for their commercialization. The most prevalent commercial catalysts are Pt-based nanoparticles, which are finely dispersed on high surface area carbon supports (Pt/C). During the fuel cell operation, considerable activity loss of Pt/C occurs because of corrosion of carbon support material, the dissolution of Pt, and the detachment of Pt nanoparticles from the carbon support. In this work, support-free 3D mesostructured spherical Pt-Ni alloy electrocatalysts (Meso-PtNi) of 100 nm in size were prepared by nanocasting mesoporous silica nanospheres (MSNs). Interestingly, hightemperature annealing at 600 °C afforded the formation of PtNi intermetallic ordered phase while reduction at 300 °C generated disordered Pt-Ni alloy phase. Electrocatalytic activity and stability of Meso-PtNi for the oxygen reduction reaction (ORR) was investigated in 0.1 M HClO4. Meso-PtNi catalysts showed enhanced performance in ORR measurement compared to Pt/C, Pt black, and Meso-Pt. Importantly, Meso-PtNi containing intermetallic phase exhibited better activity than disordered alloy structure. An accelerated degrading test (ADT) was conducted according to the US Department of Energy’s protocol. Meso-PtNi showed superior stability as compared to the commercial Pt/C and Pt black catalysts, up to 30,000 potential cycling. Particularly, the Meso-PtNi with intermetallic phase showed a remarkable stability. It was found that Meso-PtNi was activated during the early stage of ADT, and retained its increased ORR activity up to 50,000 cycling. We fabricated membrane electrode assembly based on the intermetallic Meso-PtNi cathode, and achieved the excellent single cell performance in PEMFC. |
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dc.identifier.bibliographicCitation |
18th Topical Meeting of the International Society of Electrochemistry |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/40337 |
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dc.language |
영어 |
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dc.publisher |
International Society of Electrochemistry |
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dc.title |
Self-Supported Pt-Ni Mesostructures as Ultrastable Oxygen Reduction Reaction Electrocatalysts in Proton Exchange Membrane Fuel Cell |
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dc.type |
Conference Paper |
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dc.date.conferenceDate |
2016-03-08 |
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