Ultrasmall, Coating-Free, Pyramidal Platinum Nanoparticles for High Stability Fuel Cell Oxygen Reduction.

While the py-Pt/C catalysts show little observable change in catalyst distribution or loading ( Figure S17 ), a highly significant change can be seen for sp-Pt/C ( Figure S18 ) with large areas of supporting carbon now clear of Pt and large agglomerates of Pt observable elsewhere.

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