Publication date: 10th April 2024
Increasing the concentration of dopants can be accomplished by enhancing the material's stability through the incorporation of a broader range of constituent oxides. This explains the recent development of high entropy/multi-constituent oxides, driven by the interest generated from research on high entropy alloys [1]. The enhancement of dopant concentration can be especially important in the field of protonics[2]. In the past four years we have studied a series of multiconstituent oxides and showed that they exhibit protonic conductivity or mixed ionic-electronic conductivity[3,4]. However, even if this group of oxides can potentially revolutionize the applied ceramics field there is a lot of questions stemming from high complexity of this vast materials group. From structural aspects, through electrochemical performance, to thermochemical properties, the abundance of constituents complicates the comprehension of specific properties that at the end will affect the performance of future devices. Our research is dedicated to unraveling the fundamental phenomena that govern the properties of this class of oxides.
In this talk I will focus on the high entropy and medium entropy oxides which stems from well characterized low entropy end-members including barium zirconate-barium cerate system. The presentation will cover properties such as electrical conductivity, water absorption, and thermodynamic stability. All this topics are lively involved in determination if so called high entropy oxides are indeed a new promising materials for applications in protonic ceramic electrochemical cells.
The research was financially supported by the National Science Centre (NCN), Poland, within the project 2019/35/B/ST5/00888. AM-G acknowledges financial support from the Gdańsk University of Technology by the DEC-2/2020/IDUB/IV.2/EUROPIUM grant under the Europium Short-Term Outgoing Visits - ‘Excellence Initiative - Research University’. The calorimetry at Arizona State University was supported by financial support from the U.S. Department of Energy, Office of Basic Energy Sciences, Grant DE-SC0021987.
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