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dc.contributor.authorZhang, H.
dc.contributor.authorGuan, D.
dc.contributor.authorGu, Y.
dc.contributor.authorXu, Hengyue
dc.contributor.authorWang, C.
dc.contributor.authorShao, Zongping
dc.contributor.authorGuo, Y.
dc.date.accessioned2024-04-09T06:24:18Z
dc.date.available2024-04-09T06:24:18Z
dc.date.issued2024
dc.identifier.citationZhang, H. and Guan, D. and Gu, Y. and Xu, H. and Wang, C. and Shao, Z. and Guo, Y. 2024. Tuning synergy between nickel and iron in Ruddlesden–Popper perovskites through controllable crystal dimensionalities towards enhanced oxygen-evolving activity and stability. Carbon Energy.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/94760
dc.identifier.doi10.1002/cey2.465
dc.description.abstract

Ni–Fe-based oxides are among the most promising catalysts developed to date for the bottleneck oxygen evolution reaction (OER) in water electrolysis. However, understanding and mastering the synergy of Ni and Fe remain challenging. Herein, we report that the synergy between Ni and Fe can be tailored by crystal dimensionality of Ni, Fe-contained Ruddlesden–Popper (RP)-type perovskites (La0.125Sr0.875)n+1(Ni0.25Fe0.75)nO3n+1 (n = 1, 2, 3), where the material with n = 3 shows the best OER performance in alkaline media. Soft X-ray absorption spectroscopy spectra before and after OER reveal that the material with n = 3 shows enhanced Ni/Fe–O covalency to boost the electron transfer as compared to those with n = 1 and n = 2. Further experimental investigations demonstrate that the Fe ion is the active site and the Ni ion is the stable site in this system, where such unique synergy reaches the optimum at n = 3. Besides, as n increases, the proportion of unstable rock-salt layers accordingly decreases and the leaching of ions (especially Sr2+) into the electrolyte is suppressed, which induces a decrease in the leaching of active Fe ions, ultimately leading to enhanced stability. This work provides a new avenue for rational catalyst design through the dimensional strategy.

dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DP200103332
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DP200103315
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleTuning synergy between nickel and iron in Ruddlesden–Popper perovskites through controllable crystal dimensionalities towards enhanced oxygen-evolving activity and stability
dc.typeJournal Article
dcterms.source.titleCarbon Energy
dc.date.updated2024-04-09T06:24:17Z
curtin.departmentWASM: Minerals, Energy and Chemical Engineering
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidShao, Zongping [0000-0002-4538-4218]
curtin.contributor.orcidXu, Hengyue [0000-0003-4438-9647]
curtin.contributor.researcheridShao, Zongping [B-5250-2013]
curtin.contributor.researcheridXu, Hengyue [GQP-2154-2022]
dcterms.source.eissn2637-9368
curtin.contributor.scopusauthoridShao, Zongping [55904502000] [57200900274]
curtin.contributor.scopusauthoridXu, Hengyue [57218317527]
curtin.repositoryagreementV3


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