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Super Long-Life Supercapacitors Based on the Construction of Nanohoneycomb-Like Strongly Coupled CoMoO4-3D Graphene Hybrid Electrodes
±¾ÎÄÖ÷ÒªÊǺþÄÏ´óѧ·¢±íÔÚAdvanced MaterialsһƪÎÄÕ¡£µçÈÝÆ÷µÄʵ¼ÊÓ¦ÓÃÈÔÈ»ÓÉÓÚµÍÄÜÁ¿ÃܶȶøÊܵ½ÏÞÖÆ¡£Ä¿Ç°£¬´ó¶àµÄ¹Ø×¢Ö÷Òª¼¯ÖÐÔÚ¾ßÓиßÄÜÁ¿ÃܶȺ͸ü³¤µÄµç³ØÊÙÃüµÄÐÂÄÉÃײÄÁϵĺϳɼ°Ó¦Ó᣸ÃÏîÑо¿ÖÐÌá³öÁËÒ»ÖÖÏñ·ä³²×´µÄCoMoO4ÄÉÃׯ¬×÷Ϊµç¼«²ÄÁÏ£¬¸Ã½á¹¹¾ßÓнܳöµÄµçÈÝÌØÐÔºÍÓÅÔ½µÄ³¤ÆÚÑ­»·Îȶ¨ÐÔ£¬Ôڷdz£´óµÄ³ä·ÅµçÁ÷ÃܶÈ(400 A/g)Ï£¬Ñ­»·100 000´Îºó£¬ÈÎÈ»ÓÐ96.36%µÄÈÝÁ¿±£³ÖÂÊ£¬Ï£Íû¶Ô´ó¼ÒÓÐËù°ïÖú¡£

Although the charge-discharge processes of supercapacitors are faster than those of batteries, the practical application of supercapacitors is still limited by their low energy densities. Recently, much attention has been focused on the synthesis and application of new nanomaterials with superior electro-chemical performance of higher energy densities and longer battery lifetimes. Here we present a simple and cost-effective synthesis strategy for the growth of novel nanohoneycomb(NHC)-like CoMoO4 nanosheets on a three-dimensional (3D) graphene framework as electrode material for supercapacitors. The electrochemical measurements of the NHC-like strongly coupled CoMoO4-3D graphene hybrid (NSCGH) electrodes exhibit excellent specific capacitance and superior long-term cycle stability, with the specific capacitance retention rate of 96.36% after 100 000 cycles at a large charge-discharge current density (400 A/g). Both aqueous asymmetric supercapacitors based on NSCGH and active carbon as two electrodes, and symmetric superca-pacitors based on the same NSCGH as two electrodes showed high energy densities and good cycle stability (After 100 000 cycling, the asymmetric supercapacitor remained 87.42% of its initial specifi c capacitance.).

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³¬¼¶³¤ÊÙÃüµçÈÝÆ÷  ×îз¢±íÔÚAdvanced Materials-1




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http://muchong.com/bbs/viewthread.php?tid=6610009
http://muchong.com/bbs/viewthread.php?tid=6594698

[ Last edited by Jeaweal on 2013-12-4 at 13:06 ]
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