WITHDRAWN: Electrochemical properties of CaZrO 3 -α-based solid electrolyte

Abstract

Abstract In this study, yttrium-doped calcium zirconate powders were synthesized by the conventional solid-state reaction method. The improved emf apparatus has been applied to measure the electrochemical values in the Y-doped CaZrO 3 system. The electromotive force of CaZr 0.96 Y 0.04 O 3− α has been measured by electrochemical cells of the type. ( − , ref. ) , Pt , gas mixture ( p ′ O 2 , p ″ H 2 ) | CaZr 0.96 Y 0.04 O 3 − α | gas mixture ( p ″ O 2 , p ″ H 2 ) , Pt , ( meas , + . ) The electromotive force (emf) was measured for various oxygen and hydrogen chemical potential gradients. The measurements were performed in a hydrogen-rich atmosphere for the temperature range from 973 to 1473 K. For almost all the conditions in the experiment, the measured emfs were well explained by regarding that the substantial predominant charge carrier is the proton. Under the hydrogen-rich atmosphere investigated, it was found that the emf generated only with the hydrogen activity gradient. The detailed analysis of the obtained emf data showed that the transport number of proton in CaZr 0.96 Y 0.04 O 3− α is almost unity for the hydrogen-rich atmosphere and its proton conduction domain is a little wider than that of the In-doped CaZrO 3 system.