A nickel nanoparticle/nafion-graphene oxide modified screen-printed electrode for amperometric determination of chemical oxygen demand

• Published in: Mikrochimica acta (1966) Vol. 185; no. 8; pp. 385 - 9
• Main Authors: Zhang, Baojian, Huang, Liming, Tang, Meihua, Hunter, Kenneth W., Feng, Yan, Sun, Qianwen, Wang, Jikui, Chen, Guosong
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.08.2018; Springer; Springer Nature B.V
• Subjects: Analysis; Analytical Chemistry; Characterization and Evaluation of Materials; Chemical oxygen demand; Chemistry; Chemistry and Materials Science; Data buses; Detectors; Electric properties; Electrical measurement; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrochemistry; Electrodes; Graphene; Graphite; Microengineering; Morphology; Nanochemistry; Nanoparticles; Nanotechnology; Nickel; Organic chemistry; Original Paper; Oxidation; Scanning electron microscopy; Surface water; Three dimensional flow; Three dimensional printing; Flow detection; Graphene; Screen-printing; 3D-printing; Thin-layer flow cell; COD; Nickel nanoparticles
• ISSN: 0026-3672; 1436-5073
• DOI: 10.1007/s00604-018-2917-0

A nickel nanoparticle/nafion-graphene oxide (NiNP/Nf-GO) modified screen-printed electrode (SPE) was developed for rapid and environmentally friendly electrochemical determination of chemical oxygen demand (COD). The morphology and the electrochemical performance of the SPEs with different surface modifications were investigated by scanning electron microscopy, electrochemical impedance spectroscopy, amperometry, and cyclic voltammetry, respectively. Interestingly, incorporation of graphene oxide as supporting materials to the NiNP/Nf-GO modified SPE enables high catalyst loading and electrode contact, leading to excellent electrocatalytic oxidation ability. A flow detection system was constructed based the newly designed NiNP/Nf-GO modified SPE with USB connection, a 3D-printed thin-layer flow cell (TLFC), and a peristaltic pump. The flow detection system showed an excellent performance for COD analysis with a linear detection range of 0.1~400 mg L −1 and a lower detection limit of 0.05 mg L −1 with an oxidation potential of 0.45 V. The system was further applied to determine the COD in surface water samples. The results were consistent with those obtained by using the standard method (ISO 6060). Graphical abstract A novel nickel nanoparticle/nafion-graphene oxide (NiNP/Nf-GO) modified screen-printed electrode (SPE) with excellent electrocatalytic oxidation ability was designed and fabricated. This electrode with USB connection was applied in a flow detection system equipped with a 3D-printed thin-layer flow cell and a peristaltic pump for environmentally friendly electrochemical determination of chemical oxygen demand.