4.6 Article

Three-Dimensional Graphene Aerogel Supported on Efficient Anode Electrocatalyst for Methanol Electrooxidation in Acid Media

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CATALYSTS
卷 13, 期 5, 页码 -

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MDPI
DOI: 10.3390/catal13050879

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graphene aerogel; hydrothermal; freeze-drying; catalyst; anode; direct methanol fuel cell

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This study aimed to improve the catalytic performance of an anodic catalyst for direct methanol fuel cells. Platinum nanoparticles were coated on graphene aerogel (GA) using hydrothermal, freeze-drying, and microwave reduction methods. The mesoporous structure of GA enhanced mass transfer in the electrode. The electrocatalytic performance of PtRu/GA showed superior stability and higher methanol oxidation activity compared to commercial PtRu/C.
This work attempted to improve the catalytic performance of an anodic catalyst for use in direct methanol fuel cells by coating graphene aerogel (GA) with platinum nanoparticles. A hydrothermal, freeze-drying, and microwave reduction method were used to load Pt-Ru bimetallic nanoparticles onto a graphene aerogel. The mesoporous structure of a graphene aerogel is expected to enhance the mass transfer in an electrode. XRD, Raman spectroscopy, SEM, and TEM described the as-synthesized PtRu/GA. Compared to commercial PtRu/C with the same loading (20%), the electrocatalytic performance of PtRu/GA presents superior stability in the methanol oxidation reaction. Furthermore, PtRu/GA offers an electrochemical surface area of 38.49 m(2)g(-1), with a maximal mass activity/specific activity towards methanol oxidation of 219.78 mAmg(-1)/0.287 mAcm(-2), which is higher than that of commercial PtRu/C, 73.11 mAmg(-1)/0.187 mAcm(-2). Thus, the enhanced electrocatalytic performance of PtRu/GA for methanol oxidation proved that GA has excellent potential to improve the performance of Pt catalysts and tolerance towards CO poisoning.

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