Room-Temperature Chemical Transformation Route to CuO Nanowires toward High-Performance Electrode Materials

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• 作者：Kunfeng Chen ; Dongfeng Xue
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：November 7, 2013
• 年：2013
• 卷：117
• 期：44
• 页码：22576-22583
• 全文大小：597K
• 年卷期：v.117,no.44(November 7, 2013)
• ISSN：1932-7455

文摘

We demonstrated an efficient room-temperature chemical transformation route to CuO nanowires (NWs), from irregular particles to NWs coupled with a series of phase changes from CuCl, through Cu₂(OH)₃Cl, to Cu(OH)₂, and finally to CuO. The room-temperature chemical transformation of Cu(OH)₂ NW can reserve the initial NW morphology and made the synthesized CuO NW more active in electrochemical reactions. As the anode materials for lithium ion battery, these CuO NWs can exhibit a reversible capacity of 696.1 mAh g^鈥? after 40 cycles at the rate of 100 mA g^鈥?. The high lithium-storage capacity can be ascribed to the unique structure of these CuO NWs with size of 10 nm and grain boundaries on the NWs surfaces, which show more active for the initial electrochemical reaction. CuO NWs and intermediate Cu(OH)₂ NWs can also be fabricated as pseudocapacitor electrodes; in KOH electrolyte, their specific capacitances are 118 and 114 F g^鈥? at the current density of 1 A g^鈥?. The present results indicate that the current room-temperature chemical transformation route is promising to produce advanced electrode materials for both lithium ion batteries and supercapacitors.