Enhanced oxidation of estrone at multi-wall carbon nanotubes film electrode: direct evidence for the advantage of carbon nanotubes over other carbonaceous materials.
The electrochemical behaviors of estrone at various carbonaceous nanomaterials-dihexadecyl hydrogen phosphate (DHP) composite films coated glassy carbon electrodes were investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronocoulometry (CC) and electrochemical impedance spectroscopy (EIS). Comparing with the composite films of acetylene black (AB) and carbon nanofiber (CNF), multi-wall carbon nanotubes (MWCNTs)-DHP film showed the best electrochemical performance towards the oxidation of estrone, reflected by the significantly enhanced oxidation current in the voltammograms as well as the apparently reduced charge transfer resistance in EIS. Studies on the active surface area, the surface coverage and EIS suggested that the apparently improved electrochemical responses of estrone at MWCNTs should arise from their large surface area, good conductivity and the ability to facilitate the charge transfer process. The reaction mechanisms of estrone oxidation at the three composite films were also discussed, which were expected to follow a process involved the total loss of two electrons and two protons.
Yu
Jingjing
J
Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China.
Zhao
Jia
J
Hu
Chengguo
C
Hu
Shengshui
S
D000114:Acetylene / Q000737:chemistry; D000327:Adsorption; D002138:Calibration; D002244:Carbon / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004573:Electrolytes; D004970:Estrone / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D013997:Time Factors
D004573:Electrolytes; D037742:Nanotubes, Carbon; D010710:Phosphates; D004970:Estrone; D002244:Carbon; D000114:Acetylene; D010100:Oxygen