Magnetization-induced double-layer capacitance enhancement in active carbon/Fe_3O_4 nanocomposites  

作　　者：Guoxiang Wang Hongfeng Xu Lu Lua Hong Zhao 

机构地区：[1]Liaoning Provincial Key Laboratory of New Energy Battery, Dalian Jiaotong University [2]College of Materials Science and Engineering, Dalian Jiaotong University

出　　处：《Journal of Energy Chemistry》2014年第6期809-815,共7页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.21376034 and 21373025)

摘　　要：The effects of magnetic fields on electrochemical processes have made a great impact on both theoretical and practical significances in im- proving capacitor performance. In this study, active carbon/Fe304-NPs nanocomposites （AC/Fe304-NPs） were synthesized using a facile hy- drothermal method and ultrasonic technique. Transmission electron micrographs （TEM） showed that Fe304 nanoparticles （Fe304-NPs） grew along the edge of AC. AC/Fe304-NPs nanocomposites were further used as an electrochemical electrode, and its electrochemical performance was tested under magnetization and non-magnetization conditions, respectively, in a three-electrode electrochemical device. Micro-magnetic field could improve the electric double-layer capacitance, reduce the charge transfer resistance, and enhance the discharge performance. The capacitance enhancement of magnetized electrode was increased by 33.1% at the current density of 1 A/g, and the energy density was improved to 15.97 Wh/kg, due to the addition of magnetic particles.The effects of magnetic fields on electrochemical processes have made a great impact on both theoretical and practical significances in im- proving capacitor performance. In this study, active carbon/Fe304-NPs nanocomposites （AC/Fe304-NPs） were synthesized using a facile hy- drothermal method and ultrasonic technique. Transmission electron micrographs （TEM） showed that Fe304 nanoparticles （Fe304-NPs） grew along the edge of AC. AC/Fe304-NPs nanocomposites were further used as an electrochemical electrode, and its electrochemical performance was tested under magnetization and non-magnetization conditions, respectively, in a three-electrode electrochemical device. Micro-magnetic field could improve the electric double-layer capacitance, reduce the charge transfer resistance, and enhance the discharge performance. The capacitance enhancement of magnetized electrode was increased by 33.1% at the current density of 1 A/g, and the energy density was improved to 15.97 Wh/kg, due to the addition of magnetic particles.

关 键 词：AC/Fe304-NPs nanocomposites micro-magnetic field magnetized electrode double-layer capacitor 

分 类 号：TM53[电气工程—电器] TB332[一般工业技术—材料科学与工程]