Citation: JU Guang-Kai, TAO Zhan-Liang, CHEN Jun. Controllable Preparation and Electrochemical Performance of Self-assembled Microspheres of α-MnO₂ Nanotubes[J]. Acta Physico-Chimica Sinica, ;2017, 33(7): 1421-1428. doi: 10.3866/PKU.WHXB201704077 shu

Controllable Preparation and Electrochemical Performance of Self-assembled Microspheres of α-MnO₂ Nanotubes

College of Chemistry, Nankai University, Tianjin 300071, China

Received Date: 1 March 2017
Revised Date: 24 March 2017

Fund Project: The project was supported by the National Key R&D Program of China (2016YFB0901502) and the National Natural Science Foundation of China (21231005, 51371100)

Self-assembled microspheres of α-MnO₂ nanotubes were successfully synthesized by hydrothermal method using KMnO₄ and HCl as reactants, and H₂SO₄ and NH₄Cl as auxiliaries. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) were used to characterize the structure and morphology of the products. The H⁺ and Cl^- ion concentrations substantially influence the crystal form of the product. Increasing either H⁺ or Cl^- ion concentration decreases the diameter of nanotubes but increases their length. In contrast, increasing both H⁺ and Cl^- ion concentrations, changes the product from α phase to β phase. Moreover, NH₄⁺ ion plays the key role of maintaining the product crystal and its tubular morphology. The electrochemical performance results showed that the microspheres of α-MnO₂ nanotubes with a unique morphology have a high first cycle discharge capacity of 1783.5 mAh·g^-1 at the current density of 20 mA·g^-1, along with a good rate performance. This suggests that the self-assembled microspheres were a promising material for lithium-ion batteries.
- α-MnO₂ nanotubes,
- Controllable preparation,
- Self-assembled microspheres,
- Hydrothermal synthesis,
- Lithium-ion battery
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Controllable Preparation and Electrochemical Performance of Self-assembled Microspheres of α-MnO₂ Nanotubes