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oa Non-Faradaic Electrochemical Modification of Catalytic Activity
Reversible Promotion of Platinum Metals Catalysts
- Source: Platinum Metals Review, Volume 34, Issue 3, Jul 1990, p. 122 - 130
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- 01 Jul 1990
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Abstract
The catalytic activity and selectivity of platinum metals can be altered dramatically and reversibly by interfacing the metal with a solid electrolyte which supplies ions onto the catalyst surface under the influence of an external potential. The induced change in catalytic rate is orders of magnitude higher than the rate of ion supply. This new effect has revealed a surprisingly simple exponential relationship between catalytic activity and catalyst work function. The effect appears to apply to all heterogeneously catalysed reactions, but is particularly pronounced for platinum. This interfacing of electrochemistry and catalysis appears to offer some exciting theoretical and technological possibilities.
© Johnson Matthey