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

- Ni(OH)2/TiO2 photoanode is prepared for developing non-enzymatic glucose sensors.
- Photoelectrochemical sensing of glucose is realized on Ni(OH)2/TiO2 at low voltage.
- A glucose-air photofuel cell is constructed for self-powered glucose sensing.
- Ni(OH)2/TiO2 is effective for glucose oxidation driven by visible light.

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 0.5 μM to 20 μM. 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 5 μM to 100 μM, 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.

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