Evaluation of the electrocatalytical properties of NiCo(OH)2 composite modified electrodes

• The inclusion of cobalt into Ni(OH)2 increases the catalytic oxidation of glucose.
• Different NiCo(OH)2 composites showed similar heterogeneous charge transfer rate.
• Both size and morphology are responsible for the distinct electrocatalytic behavior.

In this contribution we describe a detailed electrochemical study on the nickel hydroxide modified electrodes synthesized in the presence of different amounts of cobalt, producing tunable composite electrodes towards the electrocatalytic oxidation of glucose. The modified electrodes were studied by means of the sensitivity of detection where the results were further investigated by analyzing the heterogeneous charge transfer rate, obtained by using rotating disk electrode. It was found that despite of the higher sensitivity found, the composite electrodes have almost the same value of k indicating that the material morphology plays an important role in the electrocatalytic reaction. The modified electrode surfaces were studied by SEM images and found different sizes and morphologies of each composite deposited.

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