Carbon Nanotubes-Doped Glassy Carbon Ceramic Composite Electrode and Its Electrocatalytic Reduction of Nitrite

摘要

A conductive glassy carbon ceramic composite electrode (GCCIi) comprised of multi-walled carbon nanotubes (MWNTs) and glassy carbon microparticles in an organically modified silicate matrix was fabricated using a sol-gel method. The electrode thus prepared exhibits electrocataiytic behavior to the reduction of nitrite and facilitates the detection of nitrite at an applied potential of 0.0 V. A linear range from 2.5×10~(-5) to 3×10~(-3) M for the detection of sodium nitrite has been observed at the composite electrode with a sensitivity of 9.6 μA/mM and a detection limit of 9×10~(-6) M based on a signal-to-noise ratio of 3.