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Improved performance of direct methanol fuel cells with the porous catalyst layer using highly-active nanofiber catalyst

引用

Carbon Resources Conversion 2018年第1期1卷 61-72页

作者： yosuke tsukagoshi Hirokazu Ishitobi Nobuyoshi Nakagawa Department of Environmental Engineering Science Graduate School of Science and TechnologyGunma University1-5-1TenjinchoKiryuGunma 376-8515Japan Division of Environmental Engineering Science Gunma University1-5-1TenjinchoKiryuGunma 376-8515Japan

PtRu supported on TiO2-embedded carbon nanofibers(PtRu/TECNF),which was recently reported as a highly-active catalyst for methanol oxidation,was applied to a direct methanol fuel cell(DMFC),and the power generation performance was compared to that using the commercial PtRu/*** the comparison,the effect of the catalyst loading on the power density of the DMFC was investigated using PtRu(18 wt%)/*** DMFC power density showed a maximum at about a 1.5 mg cm2 PtRu loading that corresponds to about an 80 mm layer thickness.A catalyst layer thicker than this value reduced the power density probably due to the concentration *** PtRu content in the PtRu/TECNF was then increased to 30 wt%or more to reduce the layer thickness and to increase the power *** DMFC performance was compared to that of different anode catalysts at a 1 mg cm2 PtRu *** power density was maximized using the PtRu30 wt%/TECNF,which showed a 173 mW cm2 at 353 K and had 66 mm layer thick,that was 26%higher than that of commercial PtRu/*** current–voltage curve of the DMFC with the PtRu/TECNF suggested an improved mass transport overvoltage,but a little improvement in the activation one despite using the catalyst with about a 2 times higher activity compared to that of the commercial PtRu/*** was attributed to the lower Pt utilization of the nanofiber catalyst layer.

关键词： Direct methanol fuel cell Catalyst layer structure PtRu catalyst TiO2-embedded carbon nanofiber support Methanol oxidation reaction Power density Precious metal loading Concentration overvoltage

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