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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (3): 773-779    DOI: 10.11902/1005.4537.2024.208
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Comparison of Comprehensive Properties of Several Solid-state Reference Electrodes for Concrete
HE Aocheng1, ZHOU Qiyan1, XIAO Tang1, QU Zhanqing1, LU Xiangyu1, CHEN Songgui2, FENG Xingguo1()
1.College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China
2.Tianjin Research Institute for Water Transport Engineering, M. O. T., Tianjin 300456, China
Cite this article: 

HE Aocheng, ZHOU Qiyan, XIAO Tang, QU Zhanqing, LU Xiangyu, CHEN Songgui, FENG Xingguo. Comparison of Comprehensive Properties of Several Solid-state Reference Electrodes for Concrete. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 773-779.

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Abstract  

Solid-state reference electrodes were widely adopted to monitor the corrosion of reinforcement and chloride ion concentration in concrete protective layers, which is one of the core components of the durability monitoring equipment for concrete structures. In present, the existing electrodes cannot satisfy all the application requirements of solid-state reference electrodes in concrete environments. Thus, it is important to select solid-state reference electrodes with favorable comprehensive performance. In this article, the repeatability and stability of powder MnO2 reference electrode, colloidal MnO2 reference electrode, nickel ferrite (NiFe2O4) solid reference electrode, and graphite electrode were compared in simulated pore solution and mortar, respectively. The sensitivities of these reference electrodes also were compared when they were used in multiple operating conditions, such as different temperatures, pH values, oxygen concentrations, and chloride ion concentrations etc. The comprehensive properties of various solid-state reference electrodes were analyzed by weighing method. The results show that the powder MnO2 electrode has favorable reproducibility and stability, but it was not sensitive to the pH value in the concrete environment. In comparison, the NiFe2O4 solid-state reference electrode was insensitive to temperature and oxygen content. In summary, the powder MnO2 reference electrode displayed the best comprehensive properties in the simulated pore solution. For the short-term testing in mortar, slight differences were observed in the properties of the powder MnO2 electrode, colloidal MnO2 electrode, and nickel ferrite electrode, and further research needs to be performed on the long-term performance of the three electrodes in concrete environments.

Key words:  solid-state reference electrodes      concrete      MnO2 electrode      NiFe2O4 solid-state reference electrode      comprehensive properties     
Received:  01 July 2024      32134.14.1005.4537.2024.208
ZTFLH:  TU511  
Fund: National Key R&D Program of China(2022YFB3207400);Fundamental Research Funds for the Central Universities(TKS20220601)
Corresponding Authors:  FENG Xingguo, E-mail: fengxingguo@hhu.edu.cn

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2024.208     OR     https://www.jcscp.org/EN/Y2025/V45/I3/773

Fig.1  Structure diagram of solid-state reference electrode for concrete
Fig.2  Photos of four kinds of solid-state reference electrodes: (a) powder MnO2, (b) colloidal MnO2, (c) nickel ferrite (NiFe2O4), (d) graphite
Fig.3  Potential variations of powder MnO2 (a), colloidal MnO2 (b), nickel ferrite (c) and graphite (d) solid-state reference elect-rodes in saturated Ca(OH)2 solution
Fig.4  Reproducibility of potentials of powder MnO2 (a), colloidal MnO2 (b), nickel ferrite (c) and graphite (d) solid-state reference electrodes in saturated Ca(OH)2 solution
Fig.5  Potentials of four solid-state reference electrodes in saturated Ca(OH)2 solution at different temperatures
Fig.6  Potentials of four solid-state reference electrodes in simulated pore solutions with different pH values
Fig.7  Potentials of four solid-state reference electrodes in simulated pore solutions with different concentrations of oxygen
Fig.8  Potentials of four solid-state reference electrodes in simulated pore solutions with different concentrations of chloride

Type of

electrode

StabilizationReproducibilitySensitivity on temperatureSensitivity on pHSensitivity on oxygen concentrationSensitivity on chloride ion contentComprehensive performance
Powder MnO2++++++++++++++++++++++++
Colloidal MnO2+++++++++++++++++++++
NiFe2O4++++++++++++++++++++++
Graphite++++++++++++++++
Table 1  Comparison of the comprehensive performances of four solid-state reference electrodes
Fig.9  Potential vs. time curves of four solid-state reference electrodes in actual concrete
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