催化作用
纳米材料
材料科学
剥脱关节
草酸盐
化学工程
热液循环
锰
吸附
甲醛
空位缺陷
密度泛函理论
纳米技术
图层(电子)
纳米颗粒
比表面积
离子
无机化学
石墨烯
化学
物理化学
结晶学
计算化学
有机化学
冶金
工程类
作者
Shaopeng Rong,Pengyi Zhang,Fang Liu
标识
DOI:10.1088/1361-648x/ab401d
摘要
2D nanomaterials with atomic thickness usually exhibit high specific surface areas and atom exposure rates, which are suitable for surface reaction related applications. In this study, we selected the oxalate ions as the structure-inducing agent to synthesize δ-MnO2 ultrathin nanosheets (~4.5 nm) via a facile hydrothermal method. Subsequently, an efficient exfoliation method to prepare single-layer MnO2 nanosheets (~0.9 nm) with the major exposed {0 0 1} facets was successfully developed. We found that the oxalate ions play a major role in the growth and formation of δ-MnO2 ultrathin nanosheets, and the formation process of the ultrathin structure was also investigated. The resulting single-layer MnO2 nanosheets (monosheets) with exposed {0 0 1} facets showed much higher catalytic performance for carcinogenic airborne formaldehyde, better than few-layer ultrathin nanosheets and nanoflowers with exposed {1 0 0} facets. The reasons for the high catalytic activity of MnO2 monosheets can be attributed to its higher surface areas and oxygen vacancy concentration. Moreover, the density-functional-theory (DFT) theoretical calculations showed that the oxygen vacancy in single-layer {0 0 1} facets exhibited the strongest adsorption/activation ability to O2 and H2O, which was very favorable for catalytic oxidation of formaldehyde. The synthesis strategy of ultrathin nanosheets described in this article may serve as reference and guidance for the preparation of other 2D ultrathin nanomaterials.
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