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http://dx.doi.org/10.3740/MRSK.2011.21.3.180

Various Temperatures Affecting Characteristics of Pt/C Cathode Catalysts for Polymer Electrolyte Membrane Fuel Cells  

Yoo, Sung-Yeol (Korea Research Institute of Chemical Technology, Energy Materials Center)
Kang, Suk-Min (Korea Research Institute of Chemical Technology, Energy Materials Center)
Lee, Jin-A (Korea Research Institute of Chemical Technology, Energy Materials Center)
Rhee, Choong-Kyun (Graduate School of Analytical Science and Technology, Chungnam National University)
Ryu, Ho-Jin (Korea Research Institute of Chemical Technology, Energy Materials Center)
Publication Information
Korean Journal of Materials Research / v.21, no.3, 2011 , pp. 180-185 More about this Journal
Abstract
This study is aimed to increase the activity of cathodic catalysts for PEMFCs(Polymer Electrolyte Membrane Fuel Cells). we investigated the temperature effect of 20wt% Pt/C catalysts at five different temperatures. The catalysts were synthesized by using chemical reduction method. Before adding the formaldehyde as reducing agent, process was undergone for 2 hours at the room temperature (RT), $40^{\circ}C$, $60^{\circ}C$, $80^{\circ}C$ and $100^{\circ}C$, respectively. The performances of synthesize catalysts are compared. The electrochemical oxygen reduction reaction (ORR) was studied on 20wt% Pt/C catalysts by using a glassy carbon electrode through cyclic voltammetric curves (CV) in a 1M H2SO4 solution. The ORR specific activities of 20wt% Pt/C catalysts increased to give a relative ORR catalytic activity ordering of $80^{\circ}C$ > $100^{\circ}C$ > $60^{\circ}C$ > $40^{\circ}C$ > RT. Electrochemical active surface area (EAS) was calculated with cyclic voltammetry analysis. Prepared Pt/C (at $80^{\circ}C$, $100^{\circ}C$) catalysts has higher ESA than other catalysts. Physical characterization was made by using X-ray diffraction (XRD) and transmission electron microscope (TEM). The TEM images of the carbon supported platinum electrocatalysts ($80^{\circ}C$, $100^{\circ}C$) showed homogenous particle distribution with particle size of about 2~3.5 nm. We found that a higher reaction temperature resulted in more uniform particle distribution than lower reaction temperature and then the XRD results showed that the crystalline structure of the synthesized catalysts are seen FCC structure.
Keywords
$\underline{PEMFC\catalyst}$; temperature; ORR (Oxygen Reduction Reaction); particle distribution;
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