A scanning tunneling microscopy study of the platinum catalysts particles supported on graphite

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Abstract
Scanning tunneling microscopy has been used to image platinum catalyst precursors and reduced platinum catalyst crystallites supported on graphite substrate at ambient condition. The catalysts were prepared by impregnation and ion exchange of precursor salt solutions unto the graphite substrate. Both nonfunctionalized and nitric acid functionalized nuclear grade high purity graphites were used as substrate. The crystallites' size and distribution, microstructure, morphology, and surface structures are dependent on the substrate functionalization, the choice of precursors and the preparation method. Surface atomic structures of the crystallites deviate from that of single crystal studies but closely approximate the structure of O2 induced surface reconstruction.

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