Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar
A composite solid chloride sensor consisting of two single sensors, i.e., Ag/AgCl working electrode and Mn/MnO<sub>2</sub> reference electrode, was developed. The Ag/AgCl electrode was prepared by the anodic polarization method, while the Mn/MnO<sub>2</sub> reference electrod...
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MDPI AG
2024-03-01
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| Online Access: | https://www.mdpi.com/1424-8220/24/7/2149 |
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| author | Min Zhang Hua Fu Li Tian Zhenxing Du Penggang Wang |
| author_facet | Min Zhang Hua Fu Li Tian Zhenxing Du Penggang Wang |
| author_sort | Min Zhang |
| collection | DOAJ |
| description | A composite solid chloride sensor consisting of two single sensors, i.e., Ag/AgCl working electrode and Mn/MnO<sub>2</sub> reference electrode, was developed. The Ag/AgCl electrode was prepared by the anodic polarization method, while the Mn/MnO<sub>2</sub> reference electrode was prepared using the powder compaction technique. Then, the electrochemical performances such as stability, reproducibility, and sensitivity of the composite and single sensors were investigated in a saturated Ca(OH)<sub>2</sub> solution and mortar specimen. A current density of 0.5 mA/cm<sup>2</sup> and polarization time of 2.5 h were the optimal preparation parameters of the Ag/AgCl selective electrode. The Ag/AgCl selective electrode showed a linear potential response with the logarithm of chloride ion content in solution and had good stability, reproducibility, and anti-polarization performances. In addition, the Mn/MnO<sub>2</sub> electrode exhibited potential stability after being activated in an alkaline solution for 60 days. The composite sensor demonstrated exceptional sensitivity to the Cl<sup>−</sup> content, boasting a slope of approximately 51.1 mV/decade, and showcased excellent stability in both solution and mortar specimens. In every measurement, the time needed for the potential of a composite sensor to become stable was less than 30 s. The sensor enables non-destructive in situ monitoring of the chloride ion content in cement mortar, thus realizing early warning of deterioration of reinforcement and guaranteeing long service life of the structure. |
| first_indexed | 2024-04-24T10:34:27Z |
| format | Article |
| id | doaj.art-47fe99a5b2d34d65bfd2ba0ea3261bf2 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-24T10:34:27Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-47fe99a5b2d34d65bfd2ba0ea3261bf22024-04-12T13:26:20ZengMDPI AGSensors1424-82202024-03-01247214910.3390/s24072149Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement MortarMin Zhang0Hua Fu1Li Tian2Zhenxing Du3Penggang Wang4School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, ChinaSchool of Civil Engineering, Qingdao University of Technology, Qingdao 266033, ChinaSchool of Civil Engineering, Qingdao University of Technology, Qingdao 266033, ChinaSchool of Civil Engineering, Qingdao University of Technology, Qingdao 266033, ChinaSchool of Civil Engineering, Qingdao University of Technology, Qingdao 266033, ChinaA composite solid chloride sensor consisting of two single sensors, i.e., Ag/AgCl working electrode and Mn/MnO<sub>2</sub> reference electrode, was developed. The Ag/AgCl electrode was prepared by the anodic polarization method, while the Mn/MnO<sub>2</sub> reference electrode was prepared using the powder compaction technique. Then, the electrochemical performances such as stability, reproducibility, and sensitivity of the composite and single sensors were investigated in a saturated Ca(OH)<sub>2</sub> solution and mortar specimen. A current density of 0.5 mA/cm<sup>2</sup> and polarization time of 2.5 h were the optimal preparation parameters of the Ag/AgCl selective electrode. The Ag/AgCl selective electrode showed a linear potential response with the logarithm of chloride ion content in solution and had good stability, reproducibility, and anti-polarization performances. In addition, the Mn/MnO<sub>2</sub> electrode exhibited potential stability after being activated in an alkaline solution for 60 days. The composite sensor demonstrated exceptional sensitivity to the Cl<sup>−</sup> content, boasting a slope of approximately 51.1 mV/decade, and showcased excellent stability in both solution and mortar specimens. In every measurement, the time needed for the potential of a composite sensor to become stable was less than 30 s. The sensor enables non-destructive in situ monitoring of the chloride ion content in cement mortar, thus realizing early warning of deterioration of reinforcement and guaranteeing long service life of the structure.https://www.mdpi.com/1424-8220/24/7/2149Ag/AgCl electrodeMn/MnO<sub>2</sub> electrodechloride sensorin situ monitoring |
| spellingShingle | Min Zhang Hua Fu Li Tian Zhenxing Du Penggang Wang Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar Sensors Ag/AgCl electrode Mn/MnO<sub>2</sub> electrode chloride sensor in situ monitoring |
| title | Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar |
| title_full | Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar |
| title_fullStr | Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar |
| title_full_unstemmed | Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar |
| title_short | Embeddable Chloride Sensor for Monitoring Chloride Penetration into Cement Mortar |
| title_sort | embeddable chloride sensor for monitoring chloride penetration into cement mortar |
| topic | Ag/AgCl electrode Mn/MnO<sub>2</sub> electrode chloride sensor in situ monitoring |
| url | https://www.mdpi.com/1424-8220/24/7/2149 |
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