Electrochemical Performance and Electrocatalytic Behavior of Myoglobin Modified TiO2@3D Graphene Composite Electrode

In the study titanium dioxide ( TiO 2 ) doped three-dimensional graphene ( 3DGR ) nanocomposite ( TiO 2 @3D GR ) was prepared via a one-step hydrothermal synthesis method. SEM results showed a three-dimensional network structure with TiO 2 particles uniformly loaded in the graphene pores. Using PBS with different pH values as supporting electrolyte, the influence of acid-base property on the electrochemical experiments based on the proposed biosensor ( Nafion/Mb/TiO 2 @3DGR/CILE ) was investigated. The effect of sweep speed on electrochemical behavior was further explored. Nafion/Mb/TiO 2 @3DGR/CILE showed good electrocatalytic activity for trichloroacetic acid, NaNO 2 and H 2 O 2 with K M app as 107.12 mM, 31.53 mM and 34.23 mM, obtaining wider range of linearity and lower limit of detection. The biosensor is of important significance for future research and development of electrochemical biosensor.