Dual non-enzymatic glucose sensing on Ni(OH)2/TiO2 photoanode under visible light illumination

Abstract

A Ni(OH)2/TiO2 photoanode possessing high photoelectrocatalytic activity toward glucose oxidation driven by visible light was fabricated. The results indicated that deposition of Ni(OH)2 on TiO2 film electrode could remarkably promote the catalytic oxidation of glucose under visible light illumination. By applying a low voltage, the Ni(OH)2/TiO2 electrode showed a linear photoelectrochemical response to glucose in the concentration range from 0.5μM to 20μM. Furthermore, the high photoelectrocatalytic activity of Ni(OH)2/TiO2 electrode toward glucose oxidation was utilized to construct a glucose-air photofuel cell, which generated electrical signal responding to glucose concentration from 5μM to 100μM, without using external electrical power supply. Thus, dual non-enzymatic glucose sensors based on photocatalytic oxidation of glucose on the Ni(OH)2/TiO2 electrode under visible light illumination were demonstrated.