%0 Journal Article
%A Zeng, Yuan
%A Kindelmann, Moritz
%A Kwati, Leonard
%A Laura, Schaefer
%A Yao, Kai
%A Malzbender, Jürgen
%A Müller, Michael
%A Guillon, Olivier
%A Ivanova, Mariya
%A Menzler, Norbert H.
%T Characterization of high Zr/Ce ratio Ba(Zr,Ce,Y)O3−δ proton conductors: investigating the impact of Y on the properties of materials
%J Physical chemistry, chemical physics
%V 27
%@ 1463-9076
%C Cambridge
%I RSC Publ.
%M FZJ-2025-00037
%P 885-896
%D 2025
%X Acceptor-substituted Ba(Zr,Ce)O3 proton conducting oxides have attracted significant attention due to their excellent proton conductivity at intermediate temperatures (400–600 °C). A high Zr/Ce ratio is crucial for maintaining stability in humid or other harsh atmospheres. Herein, a systematic study was conducted on the phase composition, microstructure, and the resulting hydration ability and electrochemical performance of high Zr/Ce ratio Ba(Zr,Ce)O3 solid solutions with different Y substitution levels (10 at% to 30 at%). In this substitution range, no apparent secondary phase can be found from XRD, leading to a continuous increase in hydration content. A Y-rich phase was observed in SEM for compositions with high levels of Y substitution. The impact of Y on proton conduction was examined using EIS, with particular attention on elucidating the effects of varying amounts of Y on bulk proton conduction. The increase of proton conductivity was primarily due to the increased charge carrier (proton) concentration caused by Y substitution. Different concentrations of Y have little effect on proton mobility, indicating a compromise between different mechanisms such as the Y trapping effect and the nano-percolation effect. Grain boundary proton conduction was discussed combining the TEM-EDS results to explain the space charge layer effect. Mechanical properties and thermo-chemical stability were also considered to pave the way for real applications.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 39661081
%U <Go to ISI:>//WOS:001374199200001
%R 10.1039/D4CP04384G
%U https://juser.fz-juelich.de/record/1034923