Proton conductivity and humidity-sensing characteristics of a composite material, HZr2P3O12ZrP2O7, were investigated by an ac impedance technique in the temperature range 350–600 °C in dry He, moist He, H2, and O2 atmosphere, respectively. The conductivity of HZr2P3O12ZrP2O7 increases linearly with increasing relative humidity or hydrogen gas concentration at ∼450 °C. The increase of conductivity of HZr2P3O12ZrP2O7 with increasing water vapor or hydrogen gas pressure is consistent with the reaction H2O(gas) → H++½O2 + 2e− occurring at the electrode-electrolyte interface. The real part of the complex impedance as a function of relative humidity or H2 gas pressure is independent of frequency in the range 10–20 Hz. These results indicate that the HZr2P3O12ZrP2O7 composite ceramic is applicable for humidity and H2 gas sensing.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry