Hydrothermal synthesis of novel Mn(3)O(4) nano-octahedrons with enhanced supercapacitors performances.
Uniform and single-crystalline Mn(3)O(4) nano-octahedrons have been successfully synthesized by a simple ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) assisted hydrothermal route. The octahedron structures exhibit a high geometric symmetry with smooth surfaces and the mean side length of square base of octahedrons is ∼160 nm. The structure is reckoned to provide superior functional properties and the nano-size achieved in the present work is noted to further facilitate the material property enhancement. The formation process was proposed to begin with a "dissolution-recrystallization" which is followed by an "Ostwald ripening" mechanism. The Mn(3)O(4) nano-octahedrons exhibited an enhanced specific capacitance of 322 F g(-1) compared with the truncated octahedrons with specific capacitances of 244 F g(-1), making them a promising electrode material for supercapacitors.
Jiang
Hao
H
Temasek Laboratories, Nanyang Technological University, Singapore.
Zhao
Ting
T
Yan
Chaoyi
C
Ma
Jan
J
Li
Chunzhong
C
D003460:Crystallization; D004492:Edetic Acid / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D004581:Electronics; D017895:Manganese Compounds / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D010087:Oxides / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D014961:X-Ray Diffraction
D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D004492:Edetic Acid