Abstract
The electrocatalytic oxidation of d-glucose on Ni electrodes has been investigated comparatively to that of linear (C 2C 6) polyols by cyclic voltammetry at various concentrations, sweep rates and working temperatures. The oxidation peaks are significant ( > 150 mAcm −2 for 0.5 M d-sorbitol at 298 K and 50 mVs −1) but they occur only at potentials more positive than 1.3 V ( rhe), when the surface is covered by NiO(OH) species. Peak current densities increase with the number of OH groups and do not depend on their steric arrangement. Nickel electrodes are very efficient for the oxidation of polyols and sugars, but do not seem to be suitable as fuel cell anodes because the potentials required for the oxidation of organics are too positive.
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