Abstract
In the present study, we designed a simple non-enzymatic sensor using 10 nm NiO nanocrystals (NCs) to modify traditional graphite (carbon)-based electrode to detect 1,2-Benezenediol, popularly known as catechol. The incorporation of NiO NCs with carbon paste electrode (CPE) enhanced the effective Randles-Sevcik surface area from 0.01 cm2 to 0.06 cm2, which attributes to better electrochemical activity and reversible 1,2-Benezenediol oxidation reaction. The electrocatalytic behavior of modified carbon paste electrode (MCPE) packed densely in polyether ether ketone (PEEK) cavity showed reduction in oxidation potential and increase in current response compared to bare CPE. Amperometric sensing revealed the 1,2-Benezenediol response to a linear range of 0.5–40 µM. The detection limit, response and sensitivity of the sensor towards 1,2-Benezenediol was 1.29 µM, 4 s, and 0.529 µAµM−1cm−2 respectively making NiO-MCPE as one of the simplest yet potential detector for 1,2-Benezenediol sensing.
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