Synthesis of MnO2 Nanoparticles Confined in Ordered Mesoporous Carbon Using a Sonochemical Method

✍ Scribed by S. Zhu; H. Zhou; M. Hibino; I. Honma; M. Ichihara

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 426 KB
• Volume: 15
• Category: Article
• ISSN: 1616-301X
• DOI: 10.1002/adfm.200400222

✦ Synopsis

A sonochemical method has been successfully used in order to incorporate MnO 2 nanoparticles inside the pore channels of CMK-3 ordered mesoporous carbon. Modification of the intrachannel surfaces of CMK-3 to make them hydrophilic enables KMnO 4 to readily penetrate the pore channels. At the same time, the modification changes the surface reactivity, enabling the formation of MnO 2 nanoparticles inside the pores of CMK-3 by the sonochemical reduction of metal ions. The resultant structures were characterized by X-ray diffraction (XRD), nitrogen adsorption, and transmission electron microscopy (TEM). CMK-3 with 20 wt.-% loading of MnO 2 inside CMK-3 delivered an improved discharge performance of 223 mA h g ±1 at a relatively high rate of 1 A g ±1 . Almost no decrease in specific capacity is observed for the second cycle, and a discharge capacity of more than 165 mA h g ±1 is retained after 100 cycles. This is attributed to the nanometer-sized MnO 2 formed inside CMK-3 and the high surface area of the mesopores (3.1 nm) in which the MnO 2 nanoparticles are formed.