Thermodynamics, Transport, and Kinetics in BaZr_0.8Y_0.2O_3−δ Electrolytes and their Impact on Hydrogen Separation and Compression

This paper initially fits a comprehensive set of thermodynamic and transport properties charged mobile defects (protons, oxygen vacancies, small polarons) in proton-conducting BaZr 0.8 Y 0.2 O 3− δ (BZY20). The are based on recently published measurements, including conductivity, proton concentrations via Karl–Fischer titration, non-stoichiometry thermogravimetric analysis, all with wide ranges temperatures pressures. These needed for inclusion physics-based models. goes to fit charge-transfer kinetics Butler–Volmer form, primarily protonic-ceramic fuel cell data button-cell format. use the previously fitted without alteration. next step is consider H 2 O-incorporation (i.e. Stotz-Wagner hydration). Unfortunately, date, there no direct measurements these thermal not charge-transfer) kinetics. However, present analysis shows great sensitivities defect-incorporation kinetics, ranging from near equilibration strong rate limitations. concludes modeling interpreting performance an electrochemical hydrogen-compression cell, using newly established properties.