title: Application of three-dimensional reduced graphene oxide-gold composite modified electrode for direct electrochemistry and electrocatalysis of myoglobin.
abstract: In this paper a three-dimensional (3D) reduced graphene oxide (RGO) and gold (Au) composite was synthesized by electrodeposition and used for the electrode modification with carbon ionic liquid electrode (CILE) as the substrate electrode. Myoglobin (Mb) was further immobilized on the surface of 3D RGO-Au/CILE to obtain an electrochemical sensing platform. Direct electrochemistry of Mb on the modified electrode was investigated with a pair of well-defined redox waves appeared on cyclic voltammogram, indicating the realization of direct electron transfer of Mb with the modified electrode. The results can be ascribed to the presence of highly conductive 3D RGO-Au composite on the electrode surface that accelerate the electron transfer rate between the electroactive center of Mb and the electrode. The Mb modified electrode showed excellent electrocatalytic activity to the reduction of trichloroacetic acid in the concentration range from 0.2 to 36.0 mmol/L with the detection limit of 0.06 mmol/L (3σ).
authors.affiliation: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China.
authors.forename: Fan
authors.initials: F
authors.lastname: Shi
authors.affiliation: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China.
authors.forename: Jingwen
authors.initials: J
authors.lastname: Xi
authors.affiliation: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: Hou
authors.affiliation: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China.
authors.forename: Lin
authors.initials: L
authors.lastname: Han
authors.affiliation: College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors.forename: Guangjiu
authors.initials: G
authors.lastname: Li
authors.affiliation: College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors.forename: Shixing
authors.initials: S
authors.lastname: Gong
authors.affiliation: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China.
authors.forename: Chanxing
authors.initials: C
authors.lastname: Chen
authors.affiliation: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China. Electronic address: swyy26@hotmail.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Sun
mesh_terms: D002021:Buffers; D002384:Catalysis; D058266:Dielectric Spectroscopy; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D052578:Ionic Liquids / Q000737:chemistry; D009211:Myoglobin / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D015203:Reproducibility of Results; D013499:Surface Properties; D014238:Trichloroacetic Acid / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D002021:Buffers; D052578:Ionic Liquids; D009211:Myoglobin; D010087:Oxides; D014874:Water Pollutants, Chemical; D014238:Trichloroacetic Acid; D006046:Gold; D006108:Graphite
keywords: Direct electrochemistry; Electrocatalysis; Gold nanoparticle; Myoglobin; Three-dimensional graphene