假电容
纳米花
超级电容器
材料科学
锰
电容
纳米复合材料
电化学
水平扫描速率
化学工程
电极
碳纤维
二氧化碳
纳米技术
纳米结构
化学
复合材料
冶金
复合数
循环伏安法
物理化学
有机化学
工程类
作者
Juan Xu,Kexing Hou,Zhengwei Ju,Chaojie Ma,Wenchang Wang,Cheng Wang,Jianyu Cao,Zhidong Chen
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2017-01-01
卷期号:164 (2): A430-A437
被引量:28
摘要
Flower-like carbon dots/manganese dioxide (CQDs/MnO2) nanocomposites were successfully synthesized and investigated as novel electrode materials for supercapacitors. CQDs were uniformly distributed on the transparent petal of δ-MnO2 and a high specific surface area of 168.8 m2 g−1 was achieved for the CQDs/MnO2 sample with 10 wt% CQDs (CQDs/MnO2-10). Furthermore, the CQDs/MnO2-10 nanoflower electrode exhibited outstanding pseudocapacitance performance, including a high specific capacitance, good rate capability (210 F g−1 at 20 A g−1), and excellent charge-discharge stability (90.3% retention rate after 10,000 cycles). In addition, capacitances of 345, 333, 318, 306, and 296 F g1 can be acquired at rates of 0.5, 1, 2, 3, and 4 A g−1, respectively, which is much higher than the specific capacitances of most reported carbon coated MnO2. These excellent electrochemical properties indicate that the CQDs/MnO2 nanoflowers were efficient active materials and have a highly promising prospect for future high-performance electrochemical energy storage systems.
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