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A new high-temperature pH sensor has been successfully developed by reforming the internal reference systems of the pH sensors based on oxygen-ion conducting ceramic membrane. The conventional internal reference system, a mixture ofNi and NiO, has been replaced with partially oxidized Ni powders, where Ni and NiO coexist on the surface of particles, in order to avoid the cumbersome mixing step ofNi and NiO particles. The partially oxidized Ni particles were made by oxidizing Ni under air atmosphere at 600 °C and characterized by X-ray diffraction (XRD) and FTIR spectroscopy. The viability of the pH sensor developed was assessed in boric acid (1000 ppm-B) / lithium hydroxide (1 to 3 ppm-Li) buffer solutions at 280 °C. The pH sensor showed excellent accuracy with a small error less than ±0.2 pH units.

Fabrication and Evaluation of a New High-Temperature pH Sensor for Use in PWR Nuclear Power Plants