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Open AccessArticle

Doped PANI Coated Nano-Ag Electrode for Rapid In-Situ Detection of Bromide in Seawater

Ocean College, Zhejiang University, Zhoushan 316000, China
Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250000, China
Shandong Special Equipment Inspection and Testing Science &Technology Co., Ltd., Jinan 250000, China
Author to whom correspondence should be addressed.
Coatings 2019, 9(5), 325;
Received: 7 April 2019 / Revised: 11 May 2019 / Accepted: 16 May 2019 / Published: 17 May 2019
(This article belongs to the Special Issue Corrosion and Electrochemical Behavior of Metals Coating)
In this paper, we successfully fabricated a novel bromide ion selective electrode (Br-ISE), which was coated by bromine ion doped polyaniline as sensitive film. Using Ag wire as the substrate, a uniform and dense nano-silver layer was electroplated to enhance the specific surface area of the electrode. Subsequently, a polyaniline (PANI) film was coated onto the electrode by cyclic voltammetry in a 0.3 M aniline and 1 M HCl solution and was in-situ doped by 0.1 M KBr solution. The morphology and performance of the electrode were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and other electrochemical analysis methods, respectively. The prepared Br-ISE exhibited a wide linear dynamic range between 1.0 × 10−1 and 1.0 × 10−7 M with a near-Nernst slope of 57.33 mV/decade. In addition, the electrode possessed extremely fast response time (<1 s) and low impedance (300 Ω), high sensitivity, and good selectivity. The electrode potential drifted within 2 mV in 8 h. The lifespan was larger than three months. View Full-Text
Keywords: nano-silver; electrode; bromide ion doped PANI; film; in-situ measurement nano-silver; electrode; bromide ion doped PANI; film; in-situ measurement
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Wang, Q.; Zhou, Y.; Zhou, J.; Wu, R.; Wu, J.; Zheng, H.; Ye, Y.; Huang, Y. Doped PANI Coated Nano-Ag Electrode for Rapid In-Situ Detection of Bromide in Seawater. Coatings 2019, 9, 325.

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