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Abstract
Ti/TiO2/NiO (Ti/TNO) electrode used for electrocatalytic oxidation of nitrite was fabricated by a simple thermal decomposition method in this work. The influences of calcination temperature on crystal phase and morphology of Ti/TNO composite were explored by XRD and TEM. After being calcined at 700°C, NiO grains are closely surrounded by TiO2 grains, in which TiO2 acts as an adhesion agent to fix the NiO grains on the Ti plate. The relative contents of Ni(III) and Ti(III) species were found increase due to the close heterojunction between NiO and TiO2, which reduces the impedance and improves the electrocatalytic activity of Ti/TNO. Ti/TNO-350-700 not only exhibits as high activity as those of Ti/TNO-350 and Ti/TNO-700 for electrocatalytic removal of nitrite contaminant, but also owns a superior electrocatalytic stability, which is more than 30 times and 2.5 times longer than those of Ti/TNO-350 and Ti/TNO-700, respectively.
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