Synthesis strategies toward improved ordering of [MnO6] octahedra in tunnel structured 2 x 3 and 2 x 4 MnO2

SCRIPTA MATERIALIA

卷:195

Article

Andris, Ryan¹  Ridley, Phillip¹  Byles, Bryan W.¹  Cullen, David A.²  More, Karren L.²  Pomerantseva, Ekaterina¹ 

[1] Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

关键词: Manganese oxides;    Tunnel crystal structures;    Nanowires;    Control of the tunnel size;    Synthesis parameters;   

DOI  :  10.1016/j.scriptamat.2020.113713

来源: Elsevier

【 摘 要 】

Improved homogeneity of tunnel size in Na-stabilized 2 x 3 and 2 x 4 MnO2 structures was achieved by identifying and controlling critical synthesis parameters. 2 x 3 and 2 x 4 MnO2 tunnel manganese oxide nanowires were obtained by hydrothermal treatment of Na-birnessite, a layered manganese oxide that undergoes a layer-to-tunnel transition under high pressure and temperature. Herein, the improved ordering of [MnO6] octahedra is revealed via a combined analysis of X-ray diffraction patterns and scanning transmission electron microscopy images. We show that crystallinity of the Na-birnessite precursor and the chemical composition of the system during hydrothermal treatment are crucial for achieving the targeted size of the structural tunnels with adequate uniformity. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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