Abstract
The development of efficient fuel cells greatly promotes reducing the consumption of fossil energy, and it is crucial to enhance the platinum (Pt) catalytic activity by optimizing both the nanoparticle size and support effect. In this study, we generate a smaller and uniform size of naked Pt nanocluster (NC) catalysts via a dry process in the gas phase, and using the direct powder embedded trapping method, the Pt NCs are spatioselectively supported on Marimo carbon (MC) that comprises a high density of carbon nanofilaments. At a minimum Pt loading of 0.05 mgPt cm−2 for both the anode and cathode in a single cell configuration, a membrane-electrode assembly (MEA) formed by the dry-deposition Pt-NC(d)/MC exhibits superior power density (rated) of 0.105 gPt kW−1 at a current density of 1.2 A cm−2, which is better output power density than the conventional MEA formed by Pt catalysts via a wet process. The origin of the improved performance is investigated using transmission electron microscopy; dry-deposition Pt catalysts that are monodispersely loaded on the outer surface of MC can facilitate not only the gas reaction but also leaving the generated water. The present results demonstrate that the dry deposition of Pt NCs on MC can be used as a scalable catalyst synthesis method to reduce the Pt loading.
Highlights
To overcome the global challenges of the shortage of fossil fuels and environmental pollution, it is crucial to promote a clean energy technology.[1]
The present results demonstrate that the dry deposition of Pt NCs on Marimo carbon (MC) can be used as a scalable catalyst synthesis method to reduce the Pt loading
Because the reported sizes of Pt catalysts synthesized in the liquid phase[32,45] are similar to or larger than the size in this study, the results indicate that the direct powder embedded trapping (DiPET) method enables us to fabricate a smaller Pt catalyst on carbon material supports
Summary
To overcome the global challenges of the shortage of fossil fuels and environmental pollution, it is crucial to promote a clean energy technology.[1]. We generate a smaller and uniform size of naked Pt nanocluster (NC) catalysts via a dry process in the gas phase, and using the direct powder embedded trapping method, the Pt NCs are spatioselectively supported on Marimo carbon (MC) that comprises a high density of carbon nanofilaments.
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