Abstract
Direct ethanol fuel cells (DEFCs), which use ethanol as a fuel, have attracted considerable attention due to their relatively high energy density, the nontoxicity of ethanol, and the abundance of ethanol sources. However, since the crossover of ethanol as a fuel in DEFCs can deteriorate the cell performance due to the oxidation of ethanol (EtOH) at the cathode during oxygen reduction reaction (ORR), nonprecious metal (NPM) cathode catalysts for ORR have been studied using carbon-based nanostructures as promising alternatives to Pt-based catalysts. Herein, the doped carbon nanostructures (C/Fe-TMPP and C/Fe-Pc) as cathode catalysts were synthesized using a template method with iron(III) 5,10,15,20-(tetra-4-methoxyphenyl) porphyrin chloride (Fe-TMPP) and iron(II) phthalocyanine (Fe-Pc). In the half-cell test, C/Fe-TMPP exhibited an enhanced ORR activity in 0.5 M H2SO4 (i.e., high half-wave potential and specific current density) and maintained ORR performance in the presence of crossover ethanol, compared t...
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