Design and preparation of a ternary composite of graphene oxide/carbon dots/polypyrrole for supercapacitor application: Importance and unique role of carbon dots
Design and preparation of a ternary composite of graphene oxide/carbon dots/polypyrrole for supercapacitor application: Importance and unique role of carbon dots
复制标题
用于超级电容器应用的氧化石墨烯/碳点/聚吡咯三元复合材料的设计与制备：碳点的重要性和独特作用
DOI：
10.1016/j.carbon.2017.01.005
复制
发表时间：
2017-05
期刊：
影响因子：
10.9
通讯作者：
Hong Bi
中科院分区：
文献类型：
--
作者：
Jian Liu;Ji Wu;Hao Chen;Hong Bi
以氧化石墨烯/碳点/聚吡咯(GO/CDS/PPy)为原料，在温和条件下进行聚合反应，合成了超级电容器电极活性材料GO/CDS/PPy。夹在GO膜和PPy层之间的硫化镉可以促进电子在三元复合电极中的传输，从而降低电极的内阻和电荷转移阻力。此外，具有较大比表面积的硫化镉可以增强GO、CdS和PPy之间的界面性质，提高三元复合材料的介电常数。值得注意的是，GO/CDS/PPy在0.5A/−1的电流密度下表现出576F/g−1的比电容，由两个对称的GO/CDS/PPy电极制成的超级电容器在250W/kg−1的功率密度下具有30.1WH/kg−1的高能量密度。更重要的是，所制备的超级电容器可以在5000次循环后保持良好的循环稳定性。在实践中，一个由五个超级电容器串联组装的简单器件，只需为S充电17次，就可以为59个发光二极管指示器供电60多次。这项工作证明了CDS在提高混合电力双电层电容器/伪电容器性能方面可以发挥重要而独特的作用。
A ternary composite of graphene oxide/carbon dots/polypyrrole (GO/CDs/PPy) used as electrode active material for supercapacitor has been synthesized viain situpolymerization of GO/CDs with pyrrole under a mild condition. The CDs sandwiched between GO film and PPy layer can promote electron transportation in the ternary composite and thus reduce the internal resistance and charge transfer resistance of the electrode. Additionally, the CDs with large specific surface area can enhance the interfacial property among GO, CDs and PPy and increase the dielectric constant of the ternary composite. Notably, GO/CDs/PPy exhibits a specific capacitance of 576 F g−1at a current density of 0.5 A g−1, and a supercapacitor fabricated by two symmetric GO/CDs/PPy electrodes owns a high energy density of 30.1 Wh kg−1at a power density of 250 W kg−1. More importantly, the as–fabricated supercapacitor can keep an excellent cycle stability after 5000 cycles. In practice, a simple device assembled by five supercapacitors in series could power 59 light–emitting diode indicators for more than 60 s after only charging for 17 s. This work demonstrates that CDs can play an important and unique role in improving performance of a hybrid electric double layer capacitor (EDLC)/pseudocapacitor.
登录
查看更多内容
高功率密度还原氧化石墨烯/聚吡咯复合材料的电化学原位聚合
影响因子：
9.2
作者：
Wang, Jingping;Xu, Youlong;Zhu, Jianbo;Ren, Penggang
通讯作者：
Ren, Penggang
影响因子：
12.6
作者：
Gu, Jiangjiang;Hu, Donghua;Xi, Kai
通讯作者：
Xi, Kai
影响因子：
10.9
作者：
Lamberti, Andrea;Gigot, Arnaud;Pirri, Candido F.
通讯作者：
Pirri, Candido F.
影响因子：
6.4
作者：
Pyng Yu;X. Wen;Yon‐Rui Toh;Yu-Chieh Lee;Kuo-Yen Huang;Shujuan Huang;S. Shrestha;G. Conibeer;Jau Tang
通讯作者：
Pyng Yu;X. Wen;Yon‐Rui Toh;Yu-Chieh Lee;Kuo-Yen Huang;Shujuan Huang;S. Shrestha;G. Conibeer;Jau Tang
影响因子：
--
作者：
Tao Qian;Na Xu;Jinqiu Zhou;Tingzhou Yang;Xuejun Liu;Xiaowei Shen;Jiaqi Liang;Chenglin Yan
通讯作者：
Tao Qian;Na Xu;Jinqiu Zhou;Tingzhou Yang;Xuejun Liu;Xiaowei Shen;Jiaqi Liang;Chenglin Yan