1.College of Geography and Environmental Science, College of Chemistry and Life Science, Zhejiang Normal University, Jinhua, 321004, China ;2.School of Chemistry and Biological Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China ;3.School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China ;
Abstract:
We have developed a method for in-situ construction of a porous network-like silver film on the surface of a glassy carbon electrode (GCE). It is based on a galvanic replacement reaction where a layer of copper nanoparticles is first electrodeposited as a sacrificial template. The silver film formed possesses a porous network-like structure and consists of an assembly of numerous nanoparticles with an average size of 200 nm. The electrode displays excellent electrocatalytic activity, good stability, and fast response (within 2 s) toward the reduction of nitrate at a working potential of ?0.9 V. The catalytic currents linearly increase with the nitrate concentrations in the range of 0.08–6.52 mM, with a detection limit of 3.5 μM (S/N?=?3) and a repeatability of 3.4 % (n?=?5).