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 (≤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.
Bibliographical noteFunding Information:
One of the authors, M. Aulice Scibioh, thanks Korean Federation of Science and Technology Societies (KOFST) and Korea Science and Engineering Federation (KOSEF) for support and assistance through Brain Pool Program.
- Air utilization
- Cathode catalyst
- Direct methanol fuel cell
- Oxygen storage material
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering