Preparation of β-MnO2 and α-Mn2O3 Nanorods via a Self-sacrificing Template Route and Their Characterization and Application†

doi:10.7503/cjcu20140670

Abstract

Abstract:

Pure-phased γ-MnOOH nanorods were synthesized at 150 ℃ for 20 h through a hydrothermal reaction process, during which KMnO₄ was reduced by CH₃CH₂OH under autogeneror pressure. With γ-MnOOH nanorods as self-sacrificing template, β-MnO₂ and α-Mn₂O₃ nanorods were prepared by calcining at 350 and 600 ℃ for 90 min, respectively. The materials were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and thermal-gravimetric analysis(TGA). The results showed that γ-MnOOH nanorods had good crystallographic quality and the diameters were about 100—300 nm, the length could be as long as several micrometers. The morphology and microstructure were well reserved in β-MnO₂ and α-Mn₂O₃ products and no other morphology of impurities was observed. With β-MnO₂ and α-Mn₂O₃ nanorods as manganese sources, spinel LiMn₂O₄ samples were prepared by solid state method. At the charge/discharge rate of 0.5 C, the LiMn₂O₄ samples could deliver the initial discharge capacities of 120.4 and 123.9 mA·h/g, respectively, and present good cycling stability and rate performance.

Key words: β-MnO2, α-Mn2O3, Nanorod, Self-sacrificing template route

CLC Number:

O614

TrendMD:

ZHAO Hongyuan, LIU Xingquan, ZHANG Zheng, WU Yue, YANG Guang, CHEN Bing, XIONG Weiqiang. Preparation of β-MnO₂ and α-Mn₂O₃ Nanorods via a Self-sacrificing Template Route and Their Characterization and Application^†[J]. Chem. J. Chinese Universities, 2015, 36(3): 436.

Figures/Tables 8

Fig.1 XRD pattern(A) and SEM image(B) of the γ-MnOOH precursor

Fig.2 XRD patterns of the precursor synthesized by hydrothermal method for different time

Fig.3 TG-DTG curves(A) of the γ-MnOOH precursor

Fig.4 XRD patterns(B) of β-MnO2(a) and α-Mn2O3(b) prepared through a solid phase sintering process

Fig.5 SEM images of obtained β-MnO2(A) and α-Mn2O3(B)

Fig.6 XRD patterns of spinel LiMn2O4 samples prepared with β-MnO2 and α-Mn2O3 nanorods as manganese sources

Fig.7 SEM images of spinel LiMn2O4 samples LMO-A(A) and LMO-B(B)

Fig.8 Initial charge/discharge curves(A), cycle performances(B) and rate performances(C) of synthesized LiMn2O4 samples

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Preparation of β-MnO₂ and α-Mn₂O₃ Nanorods via a Self-sacrificing Template Route and Their Characterization and Application^†

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