Ordering Heterogeneity of [MnO6] Octahedra in Tunnel-Structured MnO2 and Its Influence on Ion Storage
| Autor: | Yifei Yuan, Bryan W. Byles, Jun Lu, Cong Liu, Zhennan Huang, Boao Song, Khalil Amine, Wentao Yao, Meng Cheng, Reza Shahbazian-Yassar, Ekaterina Pomerantseva |
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| Rok vydání: | 2019 |
| Předmět: |
Diffraction
Materials science Yield (engineering) Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Energy storage 0104 chemical sciences Ion General Energy Todorokite Octahedron Chemical physics Phase (matter) engineering 0210 nano-technology |
| Zdroj: | Joule. 3:471-484 |
| ISSN: | 2542-4351 |
| DOI: | 10.1016/j.joule.2018.10.026 |
| Popis: | Summary [MnO6] octahedra are the structural units for a large family of manganese dioxides (MnO2) possessing one-dimensional tunnel structures with extensive applications in catalysis and energy storage. Despite the long-range [MnO6] ordering confirmed by conventional diffraction tools, surprisingly, the functional properties of a specific MnO2 tunnel phase still vary significantly in literature with unclear structural origins. Here, we demonstrate the existence of tunnel heterogeneity featuring localized tunnel intergrowths within single MnO2 nanoparticles via atomically resolved imaging. The degree of tunnel heterogeneity increases with the size increase of tunnels from β-MnO2 (1 × 1 tunnel) to α-MnO2 (2 × 2 tunnel), and to todorokite MnO2 (3 × 3 tunnel). Furthermore, the tunnel heterogeneity within one MnO2 nanoparticle significantly affects the energy storage kinetics even down to sub-nanometer scale. These findings are expected to call for renewed attention to the controlled synthesis of homogeneous tunnel-specific phases with predictable properties and to yield a more precise structure-property relationship in polymorphic materials. |
| Databáze: | OpenAIRE |
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