Synthesis of Pt-immobilized on silica and polystyrene-encapsulated silica and their applications as electrocatalysts in the proton exchange membrane fuel cell
- Department of Chemical Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of)
- Department of Fiber and Polymer Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of)
Nano sized Pt particles were successfully immobilized onto SiO{sub 2} and polystyrene-encapsulated silica core shell (SiO{sub 2}@PS). To make the immobilization of Pt onto both silica and polystyrene-encapsulated silica core shell, SiO{sub 2} was first functionalized with -NH{sub 2} using 3-amino propyl trimethoxysilane (APTMS) while for core shell, the negatively charged surface of polystyrene (PS) was changed with positive charge by cationic surfactant such as cetyltrimethylammonium chloride (CTACl) to make the formation of SiO{sub 2} shell on preformed PS sphere. Transmission electron micrograph (TEM) images shows that Pt nanoparticles immobilized onto SiO{sub 2} and SiO{sub 2}@PS were to be 3-4 nm without agglomeraiton. The energy dispersive spectroscope (EDS) shows that Pt contents on both SiO{sub 2} and SiO{sub 2}@PS were to be 21.45% and 20.28%, respectively. In case of Pt-SiO{sub 2}@PS, it is believed that Pt should have been immobilized onto PS surface and pore within SiO{sub 2} shell as well as SiO{sub 2} surface. The MEA fabricated with Pt-SiO{sub 2}@PS shows better cell performance than of Pt-SiO{sub 2}.
- OSTI ID:
- 22209972
- Journal Information:
- Materials Research Bulletin, Vol. 46, Issue 1; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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