Abstract
VITREOUS carbon, heat treated at 2,500° C, has been used in our laboratory for the coulometric anodic generation of bromine with a chemically determined efficiency of 99.9%1. Potentially it has useful properties as an electrode material in electrochemistry, particularly its claimed non-reactive and non-porous nature2. In the course of our experiments conducted at current densities of 1 mA cm−2 and at room temperature, we noticed a macroscopic change in the surface of the electrode from steel grey to black. Microscopic examination showed no apparent electrochemical attack at this current density or at current densities up to 60 mA cm−2, confirming the non-reactive nature of vitreous carbon, but generation of oxygen at vitreous carbon with the objective of the coulometric generation of hydrogen ion by the reaction has revealed an interesting and unexpected result.
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