Electrochemical Sensor Based on AgNPs‐NNH Nanocomposites for Hydrogen Peroxide Detection by Zero Current Potentiometry

Abstract

Abstract The layered nickel nitrate hydroxide (NNH) nickel base material was prepared by using hydrothermal method, and the AgNPs were synthesized on the surface of NNH. The layered AgNPs‐NNH nanocomposites were used to construct electrochemical sensor for hydrogen peroxide detection. The morphology, composition and structure of the sensing interface materials were characterized and the relationship between zero current potential signals towards hydrogen peroxide and the response performance was explored. The results of field emission electron microscope (FESEM) and transmission electron microscope (TEM) showed that the NNH was layered material with a uniform thickness of 60 nm, and AgNPs evenly dispersed on the surface of NNH layer, with the size of 15 nm and 23 nm, respectively. Based on zero current potentiometry, the electrochemical results indicated that the linear range was from 1.0 nmol/L to 1.0 mmol/L, with a detection limit of 0.3 nmol/L and a sensitivity of 33.7 μV·mM –1 ·cm –2 . Compared to the chronoamperometry, the detection limit was reduced four orders of magnitude.