Fabrication and Performance of All-Solid-State Chloride Sensors in Synthetic Concrete Pore Solutions

Sensors

Xiaojian Gao¹  Jian Zhang²  Yingzi Yang² 

[1] School of Civil Engineering, Harbin Institute of Technology, Harbin 150006, China;

关键词: chloride sensor;    all-solid-state;    fabrication;    potentiometric response;    synthetic concrete pore solutions;   

DOI  :  10.3390/s10111022

来源: mdpi

【 摘 要 】

One type of all-solid-state chloride sensor was fabricated using a MnO₂ electrode and a Ag/AgCl electrode. The potentiometric response of the sensor to chloride in synthetic concrete pore solutions was systematically studied, and the polarization performance was also evaluated. The results show a good linear relationship between the potential reading of the sensor and the logarithm of chloride activity (concentration ranges from 0.05 to 5.0 M), and the potential value remains stable with increasing immersion time. The existence of K⁺, Ca²⁺, Na⁺ and SO₄²⁻ ions have little influence on the potentiometric response of the sensor to chloride, but the pH has a significant influence on the potential value of the sensor at low chloride concentration. The potential reading of the sensor increases linearly with the solution temperature over the range from 5 to 45 °C. Meanwhile, an excellent polarization behavior is proven by galvanostatic and potentiodynamic tests. All of the results reveal that the developed sensor has a great potential for monitoring chloride ions in concrete environments.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.