2020
DOI: 10.1002/sstr.202000091
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Revealing the Atomic Structures of Exposed Lateral Surfaces for Polymorphic Manganese Dioxide Nanowires

Abstract: Polymorphic 1D MnO2 nanostructures are widely applied in fields such as catalysis, sensing, and energy storage with the functionality mainly determined by the atomic patterns of their laterally exposed facets, which largely remain unclear so far. Herein, by high‐resolution transmission electron microscopy (HRTEM) imaging directly along their axial directions, the atomic structures of the outmost lateral facets of polymorphic MnO2 nanowires are disclosed. To generalize the findings, four most commonly seen phas… Show more

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Cited by 21 publications
(14 citation statements)
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“…1,10,11,12 There are intensive research efforts aimed at understanding the charge storage mechanisms of α-MnO2, which adopts a crystal structure based on an MnO6 octahedral framework with onedimensional 1×1 and 2×2 tunnels, allowing reversible insertion/extraction of charge carriers. 13,14,15,16 However, its precise charge storage mechanism as the cathode coupled with a Zn anode in aqueous mild acid electrolyte remains highly debated. Several mechanisms have been proposed: (1) Zn 2+ insertion into the tunnels whilst maintaining the original tunnel configuration 17 ;…”
Section: Introductionmentioning
confidence: 99%
“…1,10,11,12 There are intensive research efforts aimed at understanding the charge storage mechanisms of α-MnO2, which adopts a crystal structure based on an MnO6 octahedral framework with onedimensional 1×1 and 2×2 tunnels, allowing reversible insertion/extraction of charge carriers. 13,14,15,16 However, its precise charge storage mechanism as the cathode coupled with a Zn anode in aqueous mild acid electrolyte remains highly debated. Several mechanisms have been proposed: (1) Zn 2+ insertion into the tunnels whilst maintaining the original tunnel configuration 17 ;…”
Section: Introductionmentioning
confidence: 99%
“…Since the lattice energy differences between polymorphs are usually small, [ 47 ] we hypothesize that it is possible to tune the polymorphs by slightly adjusting the temperature of the solvent in which the crystallization is carried out. Layer‐to‐tunnel (L‐T) transition was observed in Mg 2+ ‐buserite after hydrothermal treatment at 220 °C, [ 48–50 ] confirming the temperature‐dependent polymorph manipulation. Here, we cycled the battery at different temperatures to alter the deposited MnO 2 polymorphs ( Figure ).…”
Section: Resultsmentioning
confidence: 88%
“…Also, the main diffraction peaks at 12.74, 18.06, 28.74, 25.65, 36.59, 38.90, 41.09, 47.18, and 56.18° can be assigned to (110), (200), (220), (310), (400), (330), (420), (510), and (600), respectively. There is no mixed crystalline phase, attesting to the great fineness of the products, and the classical crystal form of α-MnO 2 nanowires features 2 × 2 tunnels, which are composed of [MnO 6 ] octahedral units linked via an edge and/or corners (Figure b). , In Figure c, Raman bands at 644 and 575 cm –1 may be the result of the υ 2 (Mn–O) symmetric stretching vibrations of the [MnO 6 ] octahedron and υ 3 (Mn–O) stretching vibrations in the basal plane of [MnO 6 ], respectively. Moreover, another band at 472 cm –1 corresponds to the υ 4 (Mn–O) stretching vibration .…”
Section: Resultsmentioning
confidence: 99%