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Graphene is considered a promising material for fuel cell vehicles because of its excellent chemical, mechanical, and electrical properties. Recent studies have revealed that using graphene or modified graphene as the catalyst support or as a metal-free catalyst results in significant improvement in the electrocatalytic activity, long term durability, and CO tolerance. This article summarizes both the recent progress of graphene-based fuel cell research and current developments in graphene fabrication processes such as mechanical exfoliation, chemical vapor deposition, and chemical exfoliation. The roles of graphene are also discussed by introducing mechanisms on the basis of theoretical calculations as well as experimental analysis.

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Dehydrogenation of ethylbenzene with carbon dioxide has been carried out over zirconia-based catalysts. Carbon dioxide in this reaction was found to play a beneficial role as an oxidant for promoting catalytic activity. The addition of a ceria promoter to zirconia improved the catalytic activity significantly, which was attributed to increasing basicity as well as oxygen vancancies. The loading of iron oxide onto only zirconia among zirconia-related materials is effective for improving the activity.