Electrodeposition and electrocatalytic properties of Pt/Ni–Co nanowires for non-enzymatic glucose detection

A nanowire arrays system consisting of an ordered configuration of Pt, Ni and Co was constructed in single-bath solution through pulse electrodeposition. This structure was evaluated as a potential amperometric non-enzymatic sensor to detect glucose in alkaline solution. We observed a strong and fast amperometric response at low applied potential of 0.4 V vs. SCE over linear ranges of 0–0.2 mM and 0.2–8 mM glucose with sensitivities of 1125 and 333 μA mM−1 cm−2, respectively. We also observed a low detection limit for glucose of 1 μM. Correlation of the electronic and geometric modifications with the electrochemical performance characteristics enhanced catalytic activity of the electrode by applying the Ni and Co components to Pt nanowires structure. The electrode showed good analytical performance and high selectivity with no interference from other oxidable species, demonstrating its promise for developing an effective glucose sensor.

► We fabricate a non-enzyme glucose sensor based on the alloyed nanowires of Pt/Ni–Co. ► We design the process on alternate deposition of metals from single bath. ► Cooperation of Pt, Ni and Co leads to good conductivity and catalytic activity. ► Cooperation of Pt, Ni and Co lowers the applied potential of detection in this electrode. ► This electrode provides good current response in detection of low glucose amount.