Enhanced Supercapacitor Performance of Mn3O4 Nanocrystals by Doping Transition-Metal Ions

Pristine and transition-metal-doped Mn3O4 nanocrystals shaped in octahedrons have been synthesized by hydrothermal reduction of potassium permanganate and characterized by SEM/TEM, X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical experiments. The results reveal that a multist...

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Veröffentlicht in:ACS applied materials & interfaces 2013-10, Vol.5 (19), p.9508-9516
Hauptverfasser: Dong, Ruiting, Ye, Qinglan, Kuang, Lili, Lu, Xu, Zhang, Ying, Zhang, Xue, Tan, Guojin, Wen, Yanxuan, Wang, Fan
Format: Artikel
Sprache:eng
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Zusammenfassung:Pristine and transition-metal-doped Mn3O4 nanocrystals shaped in octahedrons have been synthesized by hydrothermal reduction of potassium permanganate and characterized by SEM/TEM, X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical experiments. The results reveal that a multistep reduction process is taking place, and the introduction of doping ions causes a direct synthesis of single-phase Mn3O4 nanocrystals. To assess the properties of Mn3O4 nanocrystals for their use in supercapacitors, cyclic voltammetry and galvanostatic charging–discharging measurements are performed. The phase stability during cycling and charge-transfer behavior are greatly improved by doping with transition metal, and Cr-doped Mn3O4 nanocrystals exhibit a maximum specific capacitance of 272 F g–1 at a current density of 0.5 A g–1. These doped Mn3O4 nanocrystals could be a promising candidate material for high-capacity, low-cost, and environmentally friendly electrodes for supercapacitors. In addition, these results have verified the ability of doping to improve capacitive performances of spinel-structured transition-metal oxides.
ISSN:1944-8244
1944-8252
DOI:10.1021/am402257y