Letter | Published:

Area Changes of Electrodeposited Platinum Black

Naturevolume 212pages182183 (1966) | Download Citation



IN electrochemical kinetic investigations, smooth metal electrodes are used whenever possible because they have a well defined area which does not vary with time1. There are occasions, however, when it is desirable to use electrodes consisting of finely divided metals such as platinum black, for example, in the investigation of the electro-oxidation of hydrocarbons2,3. Here the electrode area is not so well defined, and there is some question as to whether it varies with time. This is suggested by the fact that gas phase investigations of hydrocarbon adsorption4 show that platinum black sinters at temperatures as low as 100° C, particularly in a reducing atmosphere. In the work reported here, an investigation was carried out to investigate the possible sintering, and consequent area changes, which occurs at electrodeposited platinum black supported on platinum wires while immersed in 5 M orthophosphoric acid at 25° C arid 80° C.

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  1. Research Laboratories, General Motors Corporation, Warren, Michigan



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