歧化
剥脱关节
材料科学
范德瓦尔斯力
纳米片
亚稳态
锰
化学物理
结晶学
纳米技术
化学
分子
催化作用
冶金
石墨烯
生物化学
有机化学
作者
Yilan Jiang,Long Yuan,Xiyang Wang,Wei Zhang,Jinghai Liu,Xiaofeng Wu,Keke Huang,Yefei Li,Zhi-Pan Liu
标识
DOI:10.1002/anie.202010246
摘要
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-x AEx MnO3 (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.
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