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Facile synthesis of a porous network-like silver film for electrocatalytic detection of nitrate |
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| Authors: | Dan-Ling Zhou Qian-Li Zhang Zhang-Ying Lv Wan-Yi Chen Xiang-Feng Liu Ya-Hui Lu Ai-Jun Wang Jiu-Ju Feng |
| Institution: | 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). A facile method was developed for in situ construction of a porous network-like Ag film on a glassy carbon electrode by a galvanic replacement reaction, where a layer of Cu nanoparticles previously electrodeposited as a sacrificial template. Thus-formed Ag film displays excellent electrocatalytic activity, good stability, and fast response (within 2 s) toward nitrate reduction. |
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