A photoelectrochemical sensor based on nickel hydroxyl-oxide modified n-silicon electrode for hydrogen peroxide detection in an alkaline solution

作者：Li, Huaixiang^*; Hao, Wenlong; Hu, Jinchao; Wu, Hongyan

来源：Biosensors and Bioelectronics, 2013, 47: 225-230.

DOI：10.1016/j.bios.2013.03.028

• Hydrogen peroxide
• Nickel hydroxyl-oxide
• Photoelectrochemical sensor
• Silicon electrode

A novel photoelectrochemical hydrogen peroxide (H2O2) sensor was constructed with platinum (Pt) and nickel hydroxyl-oxide (NiOOH) double layers modified n-silicon electrode (NiOOH/Pt/n-n(+)-Si). About 40 nm Pt layer and about 100 nm Ni layer were successively coated on the front surface of n-n(+)-Si (1 1 1) wafers by vacuum evaporating. A stable layer of NiOOH was formed through oxidation of the Ni layer on the coated silicon wafer by the electrochemical method. The surface of modified electrode was characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The NiOOH/Pt/n-n(+)-Si electrode has been used for determination of H2O2 with a two-electrode cell in the absence of reference electrode by photocurrent measurement at a zero bias. The photoelectrochemical sensor showed a good linear response to H2O2 concentrations in a range from 1.0 x 10(-5) to 6 x 10(-5) M with a determination limit (S/N=3) of 2.2 mu M. The NiOOH/Pt/n-n(+)-Si electrode exhibited excellent reproducibility and stability. Particularly, the facile measurement requirements made this novel modified electrode promising for the development of outdoor H2O2 sensors.

• 出版日期2013-9-15
• 单位山东师范大学