Abstract
The charge storage capability of hydrous rhodium oxide films formed by activation of Rh metal in alkaline solutions was investigated. The electrochemical properties were measured in carbonate‐buffered saline solution at pH 7.3. The charge storage capacity, as determined by cyclic voltammetry, increased as the films were grown to increasing thickness. When the electrodes were biased at an anodic potential of 0.9V vs. SCE, the fraction of this charge which could be utilized with cathodal, constant current, 0.2 ms width pulses decreased from 35% on the thinnest films to less than 5% on the thickest. The absolute charge that could be injected under these pulse conditions leveled off at about 2.0 mC/cm2 geometric area. The charge injection properties of the rhodium oxide films offer an alternative to use of iridium oxide films for neural stimulation applications.
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