Confinement of Platinum Catalysts in Carbon Nanocontainers to Control the Durability in the Oxygen Reduction Reaction
In this study we have developed a series of GNF supported platinum composites for use as catalysts in the cathode side of the hydrogen fuel cell. Preformed free-standing platinum NPs (PtNPs) were deposited on either the external and internal surfaces of the GNFs using different conditions.4High resolution transmission electron microscopy (HRTEM) was used to characterise the composites, verifying the location of the PtNPs in each material (Figure1). The electrochemical active surface area of the composites materials, turn over numbers and the lifetime/stability of the materials was quantified using cyclic voltammetry, and the electrocatalytic activity of the catalyst towards the oxygen reduction reaction was assessed. It was found that depositing the PtNPs inside the GNFs (PtNPs@GNFs) rather than outside (PtNPs/GNF) resulted in a catalyst with higher catalytic activity, stability, and an increased electrochemical active surface area.
Figure 1: TEM images of the PtNPs@GNF (left) and Pt/GNFs (right) composites studied.
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