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- W4237006064 abstract "Exfoliation of non-layered (structurally) bulk materials at the nanoscale is challenging because of the strong chemical bonds in the lattice, as opposed to the weak van der Waals (vdW) interactions in layered materials. We propose a top-down method to exfoliate ϵ-MnO2 nanosheets in a family of charge-ordered La1−xAExMnO3 (AE=Ca, Sr, Ba) perovskites, taking advantage of the Jahn–Teller disproportionation effect of Mn3+ and bond-strength differences. ϵ-MnO2 crystallized into a nickel arsenide (NiAs) structure, with a thickness of 0.91 nm, displays thermal metastability and superior water oxidation activity compared to other manganese oxides. The exfoliation mechanism involves a synergistic proton-induced Mn3+ disproportionation and structural reconstruction. The synthetic method could also be potentially extended to the exfoliation of other two-dimensional nanosheet materials with non-layered structures." @default.
- W4237006064 created "2022-05-12" @default.
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- W4237006064 date "2020-09-30" @default.
- W4237006064 modified "2023-10-18" @default.
- W4237006064 title "Jahn–Teller Disproportionation Induced Exfoliation of Unit‐Cell Scale ϵ‐MnO <sub>2</sub>" @default.
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- W4237006064 doi "https://doi.org/10.1002/ange.202010246" @default.
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