Poly(Serine)‐Ag‐NiVO ₂ Nanohybrid‐Modified Glassy Carbon Electrode for Electrochemical Detection of Dihydroxybenzene Isomers

The electropolymerized‐serine (ES) and transition metal oxide nanohybrids are utilised as the sensitive electrocatalyst for the identification of dihydroxybenzene isomers (DHBIs), such as catechol (CC), resorcinol (RR), and hydroquinone (HO). The Ag‐NiVO ₂ nanohybrid is prepared via the combustion method. The phase parameters, vibrational modes, chemical composition, and surface appearance of the nanohybrids are investigated using X‐ray diffraction, Raman spectroscopy, energy‐dispersive X‐ray spectroscopy, and field‐emission scanning electron microscopy. The glassy carbon (GC) electrode surface was modified to form ES‐AgNiVO ₂ ‐reduced graphene oxide (rGO)‐GC (modified electrode) via drop‐casting and electro‐polymerisation. The electrocatalytic efficiency of the modified surface is analysed using various electroanalytical techniques. Under the optimised condition, the linearity between DHBIs concentration and oxidation current revealed the detection limit (DL) of 0.047 µM (CC), 0.09 µM (HO), and 0.018 µM (RR). The additive effect of ES, rGO, and Ag‐NiVO ₂ nanohybrid offers a conductive, lower DL, selectivity, and stability for the electrochemical identification of DHBIs and their commercial samples. The prepared electrocatalyst can be effectively utilised as an electrochemical sensor for assessing DHBIs for environmental applications. The modified materials are not expensive to synthesise; the sensor might be viable in more affordable, portable setups and better recovery for real samples.