Synergistic electrocatalytic effect of graphene/nickel hydroxide composite for the simultaneous electrochemical determination of ascorbic acid, dopamine and uric acid

A novel solar graphene-nickel hydroxide modified glassy carbon electrode was developed and used for the simultaneous detection of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The sensor exhibited appreciable electrocatalytic effect for the simultaneous detection of lower concentrations of the analytes compared to solar graphene modified glassy carbon electrode. The detection limits attained by differential pulse voltammetry (DPV) were 30 mu M, 120 nM and 0.46 mu M for AA, DA and UA respectively. Recovery values ranging from 98 - 104% were obtained for the analysis of real samples. (C) 2014 Elsevier Ltd. All rights reserved.