Cathodic deposition of binary nickel-cobalt hydroxide for non-enzymatic glucose sensing

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/(mMcm2) (R2=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.