Thermally oxidized MWCNTs (OMWCNTs) are fabricated by a thermal treatment of MWCNTs at 500 °C for 3 h in an oxygen-containing atmosphere. The oxygen content of OMWCNTs increases from 1.9 wt% for MWCNTs to 8.3 wt%. And the BET specific surface area of OMWCNTs enhances from 254.2 mgfor MWCNTs to 496.1 mg. The FeO/OMWCNTs nanocomposite is prepared by a hydrothermal method. Electrochemical measurements show that FeO/OMWCNTs still keeps a highly reversible specific capacity of 653.6 mA h gafter 200 cycles at 0.5 A g, which shows an obviously higher capacity than the sum of that of single FeOand OMWCNTs. The OMWCNTs not only buffer the volume changes of FeOnanoparticles but also provide high-speed electronic transmission channels in the charge-discharge process. The thermal oxidation method of OMWCNTs avoids using strong corrosive acids such as nitric acid and sulfuric acid, which has the advantages of safety, environmental protection, macroscopic preparation, etc.
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