Cathode catalyst layer using supported Pt catalyst on ordered mesoporous carbon for direct methanol fuel cell
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- Cathode catalyst layer using supported Pt catalyst on ordered mesoporous carbon for direct methanol fuel cell
- Kim, Hee-Tak; You, Dae Jong; Yoon, Hae-Kwon; Joo, Sang Hoon; Pak, Chanho; Chang, Hyuk; Song, In-Seob
- Issue Date
- ELSEVIER SCIENCE BV
- JOURNAL OF POWER SOURCES, v.180, no.2, pp.724 - 732
- The development of a cathode catalyst layer based on a supported Pt catalyst using an ordered mesoporous carbon (OMC) for direct methanol fuel cell is reported. An OMC with a mesopore structure between hexagonally arranged carbon nanorods is prepared using a template method. Platinum nanoparticles are supported on the OMC (Pt/OMC) with high metal loading of 60 wt.%. Compositional and morphological variations are made by varying the ionomer content and by compressing the catalyst layer to detect a parameter that determines the power performance. Increase in power density with decrease in the volume fraction of ionomer in the agglomerate comprising the Pt/OMC and the ionomer indicates that mass transport through the ionomer phase governs the kinetics of oxygen reduction. Impedance spectroscopic analysis suggests that a significant mass-transport limitation occurs at high ionomer content and in the compressed cathode. The power density of the optimum cathode layer, which employs a Pt/OMC catalyst with a Pt loading of 2 mg cm -2, is greater than that of a catalyst layer with 6 mg cm -2 Pt-black catalyst at a voltage higher than 0.4 V. This would lead to a significant reduction in the cost of the membrane electrode assembly.
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