Glucose and ascorbic acid (AA) electrooxidation are examined at a binary catalyst of nickel and cobaltnanoparticles, modified in a certain order onto glassy carbon (GC) electrode. Either nano-Ni wasdeposited then followed by nano-Co or the reverse. The modified electrodes are characterizedmorphologically and voltammetrically. The electrochemical response of the nano-Co modifiedelectrodes critically depends on the modification of the underlying substrate. Deposition of nano-Co ona pre-deposited nickel subjected to electrooxidation, designated as nano-Co/NiOx/GC, resulted in asignificant catalysis of glucose oxidation. The nano-Co/NiOx/GC electrode is utilized for thesimultaneous investigation of glucose and AA using square wave voltammetry (SWV). The lineardynamic ranges for the two species were determined. The LOD and LOQ values were calculated andfounded 0.176 and 0.528 μM for AA and 0.066 and 0.199 μM for glucose. Also, the precision of thedeveloped method was evaluated by determining the relative standard deviation (RSD) and found lessthan 2.3%.
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