Electrodeposited Tl2 O 3‐Matrix Composites: I. Effect of the Dispersed Phase on Nucleation and Growth of the Matrix

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Abstract
The electrodeposition of composites has been performed by anodic oxidation of ions in the presence of suspended particles. This study, aimed at obtaining and characterizing new electrocatalytic materials for oxygen evolution reaction, has shown that particles enhance the rate of nucleation and growth of the matrix. At each potential, induction times are shorter and kinetic constants are higher in the presence of than in its absence. The chronoamperometric transients measured during composite deposition are compatible with instantaneous nucleation and 3D growth. Scanning electron microscopy and energy dispersive X‐ray analyses data show that particles become effectively embedded in the deposit from the early stages of its formation and act as centers of preferential growth for the matrix, so that the content is higher near the electrode/composite interface than in the bulk. composites are compared with other systems for which nucleation and growth of the matrix is unaffected by the dispersed phase.

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