Nickel oxy hydroxide impregnated glassy carbon spheres composite modified BPPG electrode: Robust electrochemical interface for sulfide sensing

• Published in: Inorganic chemistry communications 2024-06, Vol.164, p.112377, Article 112377
• Main Authors: Ramakrishnappa, T., Sureshkumar, K., Prakash, H.R., Pandurangappa, M.
• Format: Article
• Language: English
• Subjects: Glassy carbon spheres; NiO(OH); NiO(OH)-GCS composites; Sewage samples; Sulfide; Wet impregnation technique
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2024.112377

[Display omitted] •A NiOOH modified glassy carbon spheres for electro catalytic oxidation of sulfide was synthesized by simple wet impregnation followed by heat treatment process.•The NiOOH modified glassy carbon spheres loaded BPPG electrode possess good electrocatalytic activity towards sulfide and used for sulfide monitoring.•The NiOOH modified glassy carbon spheres modified BPPG electrode exhibits excellent sensitivity, stability and repeatability without much surface passivation for sulfide sensing.•This reliability of the developed sensor system is validated by monitoring sulfide in sewage samples successfully. Nickel oxyhydroxide NiO(OH) modified glassy carbon sphere (GCS) composites (NiO(OH)-GCS) were synthesized by wet impregnation technique followed by thermal treatment. The NiO(OH)-GCS modified basal plane pyrolytic graphite (BPPG) electrode was used as the electrochemical interface for sulfide sensing. The NiO(OH)-GCS composites were synthesized by impregnating aqueous NiNO2 with GCS followed by thermal treatment of the solution mixture at 823 K. (X ray diffraction) XRD and cyclic voltammetric (CV) investigations of the composites infer the presence and formation of NiO(OH) during synthesis. Then the electrocatalytic oxidation studies of the sulfide on a NiO(OH)-GCS composite modified BPPG electrode has been studied by cyclic voltammetry (CV). The linear range, the limit of detection (LOD), and sensitivity of the NiO(OH)-GCS composites modified BBPG electrode exhibited 1.0–100.0 µg, 1.032 µg, and 1500.0 μA μM−1 cm−2 for sulfide sensing. The NiO(OH)-GCS composite modified BPPG electrode has been tested for monitoring the sulfide in sewage samples and results were compared with the standard methylene blue method.