Abstract
Binary Ni-Co hydroxide is directly grown on screen-printed carbon electrodes (SPCEs) through cathodic deposition for detecting glucose. The material has been identified to consist of nickel-cobalt hydroxide (denoted as (Ni-Co)(OH) 2 ) by X-ray photoelectron spectroscopic analysis. From cyclic voltammetric (CV) and chronoamperometric (CA) results, (Ni-Co)(OH) 2 shows a more explicit signal than Co(OH) 2 and a less positive detecting potential than Ni(OH) 2 for glucose oxidation. Such synergistic performances suggest the atomic scale mixing of Ni and Co ions in the hydroxide matrix. The amperometric detection of this non-enzymatic glucose sensing shows a linear calibration curve up to 3700μM with a sensitivity of 122.45μA/(mMcm 2 ) (R 2 =0.989). The interference responses of 25μM ascobic acid (AA), uric acid (UA), and dopamine (DA) were 10.76, 14.29 and 1.41% of the signal of 0.2mM glucose, respectively. The binary (Ni-Co)(OH) 2 exhibits a low detecting potential, a high signal-to-noise ratio, and a wide calibration-curve range for the non-enzymatic glucose sensing. © 2013 Taiwan Institute of Chemical Engineers.