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In perchloric acid, platinum oxide formation passivates large low-index platinum surfaces, reducing dissolution at higher potentials, whereas nanofaceted surfaces dissolve faster at higher potentials due to dissolution primarily occurring at edges and corners. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

January 1, 2006

Stability and Dissolution of Platinum Surfaces in Perchloric Acid

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Abstract

Stability and dissolution of platinum single-crystal surfaces were investigated with atomic force microscopy and inductively coupled plasma mass spectrometry. Both low-index surfaces and nanofaceted surfaces were investigated. A clear difference was observed between the large low-index surfaces and the nanofaceted surfaces. In the low-index surfaces, the platinum oxide formation passivates the surfaces, resulting in a lower dissolution rates at higher potentials. The nanofaceted surface dissolves faster at a higher potential, indicating the edges and corners are the main sources of dissolution. The differences in the dissolution behaviors between the low-index surfaces, (111), (100), and (110), are also discussed.

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