Preparation of Ni(OH)2 nanosheets on Ni foam via a direct precipitation method for a highly sensitive non-enzymatic glucose sensor

Abstract

Ni(OH)₂ nanosheets on Ni foam was prepared by the direct precipitation method. The morphology and phase composition of the as-prepared Ni(OH)₂ nanosheets/Ni electrode were characterized by scanning electron microscopy and X-ray diffraction, respectively. The electrode's electrochemical behavior was investigated by cyclic voltammetry and the constant potential amperometry technique. The best performance of the glucose sensor can be obtained at 0.51 V in a 0.2 M sodium hydroxide solution. The as-prepared Ni(OH)₂ nanosheets/Ni electrode shows high sensitivity with 1130 μA mM⁻¹ cm⁻² at the glucose concentration range of 2 μM to 40 μM and 1097 μA mM⁻¹ cm⁻² at the range of 0.1 mM to 2.5 mM. The response time of this electrode is less than 2 seconds, and its detection limit is 1 μM.