Bismuth Tellurate Nanospheres and Electrochemical Behaviors of L-Cysteine at the Nanospheres Modified Electrode

摘要

Bismuth tellurate nanospheres have been successfully synthesized by a facile hydrothermal route. X-ray diffraction (XRD) shows that the nanospheres are composed of orthorhombic Bi2Te2O7 phase. Scanning electron microscopy (SEM) displays that the diameter of the nanospheres is 100-500 nm. The bismuth tellurate nanospheres (BTS) modified glassy carbon electrode (GCE) has been prepared for the electrochemical detection of L-cysteine (L-CySH). A pair of semi-reversible CV peaks at +0.14 V and-0.84 V, respectively are observed. The BTS modified GCE displays high electrocatalytic activity toward L-CySH and exhibits a linear relationship in the range of 0.0001-2 mM with a detection limit of 0.046 mu M in KCl solution. The broad linear range, low detection limit, good reproducibility and stability make the BTS modified GCE valuable for the practical application.