Elucidation of the Transport Properties of Calcium-Doped High Entropy Rare Earth Aluminates for Solid Oxide Fuel Cell Applications.

Autor: Kante MV; Institute of Nanotechnology, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany., Nilayam ARL; Institute of Nanotechnology, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.; Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe institute of Technology, 76344, Eggenstein-Leopoldshafen, Germany., Hahn H; Institute of Nanotechnology, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.; Department of Chemical, Biological and Materials Engineering, The University of Oklahoma, 100 E. Boyd St., Norman, OK, 73019, USA., Bhattacharya SS; Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India., Elm MT; Center for Materials Research, Institute of Experimental Physics I, and Institute of Physical Chemistry, Justus-Liebig-Universität Gießen, 35392, Gießen, Germany., Velasco L; Direccion academica, Universidad Nacional de Colombia sede de La Paz, Km 9 via Valledupar - La Paz, Cesar, 202010, Colombia., Botros M; Institute of Nanotechnology, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Aug; Vol. 20 (34), pp. e2309735. Date of Electronic Publication: 2024 Apr 15.
DOI: 10.1002/smll.202309735
Abstrakt: Solid oxide fuel cells (SOFCs) are paving the way to clean energy conversion, relying on efficient oxygen-ion conductors with high ionic conductivity coupled with a negligible electronic contribution. Doped rare earth aluminates are promising candidates for SOFC electrolytes due to their high ionic conductivity. However, they often suffer from p-type electronic conductivity at operating temperatures above 500 °C under oxidizing conditions caused by the incorporation of oxygen into the lattice. High entropy materials are a new class of materials conceptualized to be stable at higher temperatures due to their high configurational entropy. Introducing this concept to rare earth aluminates can be a promising approach to stabilize the lattice by shifting the stoichiometric point of the oxides to higher oxygen activities, and thereby, reducing the p-type electronic conductivity in the relevant oxygen partial pressure range. In this study, the high entropy oxide (Gd,La,Nd,Pr,Sm)AlO 3 is synthesized and doped with Ca. The Ca-doped (Gd,La,Nd,Pr,Sm)AlO 3 compounds exhibit a higher ionic conductivity than most of the corresponding Ca-doped rare earth aluminates accompanied by a reduction of the p-type electronic conductivity contribution typically observed under oxidizing conditions. In light of these findings, this study introduces high entropy aluminates as a promising candidate for SOFC electrolytes.
(© 2024 The Authors. Small published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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