التفاصيل البيبلوغرافية
| العنوان: |
The evolution of α-MnO from hollow cubes to hollow spheres and their electrochemical performance for supercapacitors. |
| المؤلفون: |
Xie, Guomeng, Liu, Xin, Li, Qing, Lin, Hua, Li, Yuan, Nie, Ming, Qin, Lizhao |
| المصدر: |
Journal of Materials Science; Sep2017, Vol. 52 Issue 18, p10915-10926, 12p |
| مصطلحات موضوعية: |
X-ray diffraction, CRYSTALS, X-ray photoelectron spectroscopy, SCANNING electron microscopy, SUPERCAPACITORS |
| مستخلص: |
The evolution of α-MnO from hollow cubes to hollow spheres was achieved by using MnCO as the template. The as-obtained α-MnO crystals were characterized by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET). The as-synthesized α-MnO hollow cubes (with the side length of about 2 µm) and hollow spheres (with the diameter of about 2 µm) were uniform particles. The as-prepared α-MnO hollow spheres have a large specific surface area (417 m g). A process has been proposed for the evolution of MnCO templates from cubes to spheres. Then, the evolution of α-MnO was achieved by two-step mechanism with the treatment of previously obtained MnCO templates. Cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) measurements were used to characterize the electrochemical performances of the as-synthesized α-MnO. The initial specific capacitance at a current density of 1 A g of the as-prepared α-MnO hollow spheres is 203 F g, which is higher than that of α-MnO hollow cubes (152 F g). In addition, the α-MnO hollow cubes retain 93% and the α-MnO hollow spheres retain 80% of the initial specific capacitance after 2000 charge/discharge cycles at 2 A g. The α-MnO hollow spheres-based supercapacitors exhibit 38.7 W h kg at a power density of 1000 W kg and maintain 7.8 W h kg at a high power density of 10028 W kg. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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