Iridium Oxide Dendrite as a Highly Efficient Dual Electro-Catalyst for Water Splitting and Sensing of H 2 O 2

Abstract

The synthesis and electrocatalytic performance of iridium-oxide (IrO2) are reported. IrO2 was electrochemically deposited on the gold dendrite template prepared by the chronoamperometry. The influence of the synthetic condition on the morphology, phase composition, and accessible surface area of the IrO2 dendrites was investigated. The optimized IrO2 dendrites showed an excellent electrocatalytic activity toward oxygen evolution with a low overpotential of 240 mV at 5 mAcm−2 and to the sensing of hydrogen peroxide with a high sensitivity of 692.38 µAmM−1cm−2 in a wide linear range.