A green and scalable dry synthesis of NiCo2O4/graphene nanohybrids for high-performance supercapacitor and enzymeless glucose biosensor applications

• Published in: Journal of alloys and compounds Vol. 696; pp. 193 - 200
• Main Authors: Ko, Tae-Hoon, Radhakrishnan, Sivaprakasam, Seo, Min-Kang, Khil, Myung-Seob, Kim, Hak-Yong, Kim, Byoung-Suhk
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05.03.2017; Elsevier BV
• Subjects: Biosensors; Catalysis; Decoration; Electrocatalysis; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrode; Electrodes; Glucose; Glucose biosensor; Graphene; Graphene nanosheet; Nanoparticles; Nickel cobaltite; Nickel compounds; Oxidation; Spectroscopic analysis; Supercapacitor; Supercapacitors; Synthesis; Transmission electron microscopy; Supercapacitor; Nickel cobaltite; Glucose biosensor; Electrode; Graphene nanosheet
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2016.11.234

We have prepared NiCo2O4 nanoparticles decorated graphene nanosheets (NiCo2O4/graphene) nanohybrids via a dry and scalable synthesis technique. FE-SEM and TEM images of as-prepared NiCo2O4/graphene nanohybrids showed uniformly well decoration of NiCo2O4 nanoparticles on the surfaces of graphene nanosheets. The electrochemical performance of NiCo2O4/graphene nanohybrids was analyzed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The NiCo2O4-decorated graphene electrode exhibited a maximum specific capacitance of 886 Fg−1 at a scan rate of 5.0 mVs−1, and also showed high cyclic stability with retention of 82.1% after 2000 cycle. As an enzymeless glucose biosensor, the NiCo2O4/graphene modified GC electrode showed excellent electro-catalytic behavior towards glucose with higher oxidation peak current. [Display omitted] •NiCo2O4/graphene nanohybrids prepared by a dry and scalable synthesis technique.•NiCo2O4/graphene nanohybrids exhibit high cyclic stability with retention of 82.1% after 2000 cycle.•NiCo2O4/graphene nanohybrids exhibit excellent electro-catalytic behavior towards glucose.