Isotopic effect of proton conductivity in barium-zirconates for various hydrogen-containing atmospheres

TL;DR

This study investigates how isotopic substitution affects proton conductivity in Y-doped BaZrO3 perovskites under various atmospheres, revealing doping influences on conductivity and isotopic effects at high temperatures.

Contribution

It provides new insights into the isotopic effects on proton conductivity in BaZrO3-based materials, especially considering Co co-doping and different atmospheres.

Findings

Significant isotopic effects observed in proton conductivity.

Co-doping influences sinterability and conductivity.

Different atmospheres affect proton conduction behavior.

Abstract

Among various perovskite proton conducting oxides, Y-doped BaZrO3 perovskite is a promising material for electrochemical hydrogen devices due to the good chemical stability and higher proton conductivity at higher operating temperatures like 500-800 {\deg}C. For the practical application of the functional BaZrO3 proton conductor in the electrochemical hydrogen devices, its necessary to understand the isotopic effect of proton conductivity. To understand the isotopic effect of proton conductivity in the barium zirconates, in this study, the proton conductivity in the Ar, (Ar + 4% H2), (Ar + 4% D2), (Ar + H2O), (Ar + D2O), and O2 atmospheres were measured for two different compositions: BaZr0.9Y0.1O2.95 (BZY), and BaZr0.955Y0.03Co0.015O2.97 (BZYC) in the temperature range from 500 {\deg}C to 1000 {\deg}C. By comparing the obtained results, a significant difference in sinterability, conductivity, and the isotopic effect was observed due to the co-doping of the Co element in the BaZr1-xYxO3-a proton conductor.