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Open AccessArticle

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

1
Ocean College, Zhejiang University, Zhoushan 316000, China
2
Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250000, China
3
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; https://doi.org/10.3390/coatings9050325
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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