PENG Jia-zhuo^1,2, LI He-ping¹, XU Li-ping ¹, LI Juan ^1,2, XIANG Jiao ^1,2

(1. Laboratory for High Temperature & High pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2. University of Chinese Academy of Sciences, Beijing 100039, China)

Abstract: Hydrogen fugacity is one of the most important physicochemical parameters in high temperature high pressure hydrothermal systems, and it is critically important to in situ measure the hydrogen fugacity in hydrothermal systems. Combining with the merits of good chemical stability and high proton conductivity, BaZrO₃ based proton conductor is a promising candidate for solid electrolytes in hydrogen sensor. A brief review on methods of preparation and conduction mechanism of BaZrO₃ based proton conductor is given. This article also surveys the application to in situ measurement of hydrogen fugacity in hydrothermal systems, as well as shortcomings of BaZrO₃ based proton conductor.