3D porous CNT/MnO2 composite electrode for high-performance enzymeless glucose detection and supercapacitor application

• Published in: Sensors and actuators. B, Chemical Vol. 206; pp. 407 - 414
• Main Authors: Guo, Chunyan, Li, Hua, Zhang, Xuan, Huo, Huanhuan, Xu, Cailing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2015
• Subjects: CNT; Glucose sensor; MnO2; Supercapacitor; Synergistic effect; MnO2; CNT; Supercapacitor; Glucose sensor; Synergistic effect
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2014.09.058

•3D porous CNT/MnO2 composite is developed via a facile method.•The enzymeless glucose sensor has high sensitivity and low detect limit.•The supercapacitor exhibits high specific capacitance energy density.•The good property is ascribed to the synergistic effect of the materials. We successfully developed a 3D porous CNT/MnO2 composite electrode based on manganese oxide and carbon nanotubes (CNTs) by a simple “dipping and drying” process followed by a potentionstatic deposition technology for non-enzymatic glucose detection and supercapacitor applications. The composition and structure of the as-prepared electrode were characterized by energy-dispersive X-ray spectroscopy (EDX), field Emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), respectively. The electrochemical performances were evaluated by cyclic voltammetry (CV), chronopotentiometry (CP) and Amperometric i–t techniques. The as-prepared sensor could accurately detect glucose in 0.5M NaOH solution in the presence of interferences, such as ascorbic acid, uric acid and fructose, with a high sensitivity up to 3406.4μA/(cm2mM). These excellent electrochemical performances were closely related to the synergistic effect of two components and the unique 3D porous architecture of the electrode. A symmetrical supercapacitor has been also fabricated using the novel electrodes and it exhibited a high specific capacitance of 160.5F/g at the current density of 1A/g which can rival with the asymmetrical supercapacitor. Such symmetrical device delivered prominent energy density of 22.3Whkg−1 at the power density of 500Wkg−1. All of these perfect performances paved the way for this hybrid to be a potential competitive candidate in the application of glucose sensor and supercapacitor.