High proton conduction in Ba2LuAlO5 with highly oxygen-deficient layers

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dc.contributor.authorMorikawa, Ren_AU
dc.contributor.authorMurakami, Ten_AU
dc.contributor.authorFujii, Ken_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorIkeda, Yen_AU
dc.contributor.authorNambu, Yen_AU
dc.contributor.authorYashima, Men_AU
dc.date.accessioned2023-11-20T01:07:43Zen_AU
dc.date.available2023-11-20T01:07:43Zen_AU
dc.date.issued2023-06-06en_AU
dc.date.statistics2023-06-23en_AU
dc.description.abstractProton conductors have found diverse applications, such as electrolytes in proton ceramic fuel cells, which require high ionic conductivity at low temperatures and high chemical stability. Here, we report the oxide, Ba2LuAlO5, which exhibits proton conductivities of 10−2 S cm−1 at 487 °C and 1.5 × 10−3 S cm−1 at 232 °C, high diffusivity and high chemical stability without chemical doping. Ba2LuAlO5 is a hexagonal perovskite-related oxide with highly oxygen-deficient hexagonal close-packed h′ layers, which enables a large amount of water uptake x = 0.50 in Ba2LuAlO5·x H2O. Ab initio molecular dynamics simulations and neutron diffraction show the hydration in the h′ layer and proton migration mainly around cubic close-packed c layers existing at the interface of octahedral LuO6 layers. These results demonstrate that the high proton conduction allowed by the highly oxygen-deficient and cubic close-packed layers is a promising strategy for the development of high-performance proton conductors. © 2023 The Authors - Open Access CC BYen_AU
dc.description.sponsorshipWe would like to express special thanks to Dr. Y. Yasui for the valuable discussion on the crystal structure analysis. We would like to thank Mr. M. Ohkawara for his assistance in the neutron diffraction experiments with HERMES, which were carried out by the projects (22603, 22610, 22614, 21578). We also thank Shin-Etsu Chemical Co. Ltd. and Kojundo Chemical Laboratory Co. Ltd. for providing raw materials and arranging ICP-AES measurements. We acknowledge Dr. M. Tada for carrying out the Raman measurements. We also acknowledge JASCO Co. for measuring IR data. This work was supported by Grant-in-Aid for Scientific Research (KAKENHI, JP19H00821, JP19K23647, JP21K14701, JP21K18182, JP21H03732, JP22H04504, JP22H05145, JP23K04887, JP23H04618) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, Adaptable and Seamless Technology Transfer Program through Target-driven R&D (A-STEP) from the Japan Science and Technology Agency (JST) Grant Number JPMJTR22TC, JSPS Core-to-Core Programs, A Advanced Research Networks (Solid Oxide Interfaces for Faster Ion Transport; Mixed Anion Research for Energy Conversion [JPJSCCA20200004]), JST FOREST (Grant No. JPMJFR202V), and the Institute for Solid State Physics, the University of Tokyo. Test experiments were carried out by project Nos. 2020L801, 2021B1826, and 2021G615. T.M. acknowledges support from the Izumi Science and Technology Foundation, the Iwatani Naoji Foundation, the Daiichi Kigenso Kagaku Kogyo Co., Ltd., the Hattori Hokokai Foundation, and Iketani Science and Technology Foundation. M.A. acknowledges the support from JSPS: Invitational Fellowship for Research in Japan L19533.en_AU
dc.identifier.articlenumber42en_AU
dc.identifier.citationMorikawa, R., Murakami, T., Fujii, K., Avdeev, M., Ikeda, Y., Nambu, Y., & Yashima, M. (2023). High proton conduction in Ba2LuAlO5 with highly oxygen-deficient layers. Communications Materials, 4(1), 42. doi:10.1038/s43246-023-00364-5en_AU
dc.identifier.doi10.1038/s43246-023-00364-5en_AU
dc.identifier.issn2662-4443en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleCommunications Materialsen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15210en_AU
dc.identifier.volume4en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.relation.ispartofCommunications Materialsen_AU
dc.relation.urihttps://doi.org/10.1038/s43246-023-00364-5en_AU
dc.subjectFuel cellsen_AU
dc.subjectProton conductivityen_AU
dc.subjectLayersen_AU
dc.subjectIonic conductivityen_AU
dc.subjectStabilityen_AU
dc.subjectPerovskiteen_AU
dc.subjectOxidesen_AU
dc.titleHigh proton conduction in Ba2LuAlO5 with highly oxygen-deficient layersen_AU
dc.typeJournal Articleen_AU
oaire.citation.issue1en_AU
oaire.citation.volume4en_AU
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