Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10568441 | Journal of Power Sources | 2005 | 7 Pages |
Abstract
Incorporation of nanophase ceria (CeO2) into the cathode catalyst Pt/C increased the local oxygen concentration in an air atmosphere, leading to enhanced single-cell performance of direct methanol fuel cell (DMFC). Ceria doped catalysts were effective at low oxygen partial pressure (â¤0.6 atm) conditions and 1 wt.% CeO2 doped Pt/C exhibited the highest performance. The effect of ceria was more prominent with air as the cathode reactant and the ceria acted as a mere impurity in a pure oxygen atmosphere, decreasing the DMFC performance. Impedance spectra showed a decrease in polarization resistance with the ceria addition to the cathode catalyst in low-potential regions confirming the facile mass transfer of the reactant oxygen molecules to catalytic sites. Transmission electron microscopy (TEM) pictures showed a uniform distribution of CeO2 around platinum sites.
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Authors
Hwan Bae Yu, Joon-Hee Kim, Ho-In Lee, M. Aulice Scibioh, Jaeyoung Lee, Jonghee Han, Sung Pil Yoon, Heung Yong Ha,