Abstract
Manganese oxides are one of the most valuable materials for batteries, fuel cells and catalysis. Herein, we report the change in morphology and phase of as-synthesized Mn2O3 by inserting Na+ ions. In particular, Mn2O3 nanoparticles were first transformed to 2 nm thin Na0.55Mn2O4·1.5H2O nanosheets and nanobelts via hydrothermal exfoliation and Na cation intercalation, and finally to sub-mm ultra-long single crystalline Na4Mn9O18 nanowires. This paper reports the morphology and phase-dependent magnetic and catalytic (CO oxidation) properties of the as-synthesized nanostructured Na intercalated Mn-based materials.
Highlights
Manganese (Mn) oxides are indispensable materials in many applications, in batteries, fuel cells, supercapacitors, and catalysts[1,2,3,4,5,6,7,8,9,10]
Many studies have reported the electrochemical properties of Na-inserted MnOx materials[32,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56], this study examined the undiscovered Na-insertion and morphological behaviors of Mn2O3 nanoparticles during a hydrothermal reaction process
The X-ray diffraction (XRD) patterns (□ ) of the initial starting material synthesized by a hydrothermal method at 120 °C for 12 hrs revealed tetragonal Mn3O4
Summary
Manganese (Mn) oxides are indispensable materials in many applications, in batteries, fuel cells, supercapacitors, and catalysts[1,2,3,4,5,6,7,8,9,10]. Hosono et al used a hydrothermal method (Teflon-lined autoclave at 205 °C for 2 days) using Mn3O4 powder in a 5.0 M NaOH solution and obtained single-crystalline Na0.44MnO2 nanowires with superior capacity of 120 mAh/g and high charge-discharge cyclability[52]. In these cases, the efficiency of the material was shown to be dependent on the surface area and morphology; an understanding of the change in morphology during Na (or Li and K) ion-insertion is very important. The present study provides several new insights into the development of alkali metal ion intercalated Mn materials
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