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| Highly Activated Polyporous Silver Film: Preparation by Voltammetric Etching with Chloride Ion Promotion and Electrochemical Determination of Trichloroacetic Acid |
| Author Name | Affiliation | E-mail | | CHU You-Qun | State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China | | | WANG Ling-Qiao | State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China | | | HUANG Zhang-Kao | State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China | | | XU Ying-Hua | State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China | | | ZHAO Feng-Ming | State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China | zhaofm@zjut.edu.cn |
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| Abstract: A highly activated polyporous silver film was constructed on the outer ring of silver wire by voltammetric etching using halogen anions. In particular, chloride ion etching can promote the formation of self-supported porous channel structure on silver wire surface via microcell reactions. Appling a continuous positive potential to the silver wire electrode contributes to form a thin film of AgCl. After electrochemical reduction, chloride ions are stripped from AgCl and the AgCl spontaneously transformed to self-supported polyporous silver film. The as prepared self-supported polyporous silver film electrode (p-Ag film) reveals substantial electrocatalytic activity for the selective and sensitive sensing of trichloroacetic acid. The p-Ag film electrode displays 174 and 3.7 times enhancement in electrochemical active surface area and the dechlorination reaction, relative to the pristine silver wire electrode (r-Ag wire). The novel electrodes exhibited a low detection limit of 70 nmol·L-1 (fitting correlation coefficient R2=0.998 3) with the trichloroacetic acid concentration range of 0.1~518.1 μmol·L-1. |
| Keywords: silver anions chlorine polyporous structure electrochemistry sensors |
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| CHU You-Qun,WANG Ling-Qiao,HUANG Zhang-Kao,XU Ying-Hua,ZHAO Feng-Ming.Highly Activated Polyporous Silver Film: Preparation by Voltammetric Etching with Chloride Ion Promotion and Electrochemical Determination of Trichloroacetic Acid[J].Chinese Journal of Inorganic Chemistry,2020,36(3):555-565. |
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