A carbon quantum dot decorated RuO2 network: outstanding supercapacitances under ultrafast charge and discharge
A carbon quantum dot decorated RuO2 network: outstanding supercapacitances under ultrafast charge and discharge
复制标题
碳量子点修饰的RuO2网络：超快充放电下出色的超级电容
DOI：
10.1039/c3ee41776j
复制
发表时间：
2013-11
期刊：
影响因子：
--
通讯作者：
Banks, Craig E.
中科院分区：
文献类型：
--
作者：
Zhu, Yirong;Ji, Xiaobo;Pan, Chenchi;Sun, Qingqing;Song, Weixin;Fang, Laibing;Chen, Qiyuan;Banks, Craig E.
碳量子点由于其独特的性质，近年来引起了众多领域研究者的广泛关注。在本工作中，首次报道了CQD基混合物作为超级电容器优良电极材料的新应用。CQD是通过一个简单的化学氧化方法，然后他们被热还原，并进一步修饰RuO 2，以获得复合材料。该混合物在50 A g− 1的过电流密度下表现出460 F g− 1的比电容（41.9 wt% Ru负载），以及优异的倍率性能（与1 A g−1相比，在10、20和50 A g−1下的容量留存率分别为88.6、84.2和77.4%）。令人惊讶的是，该混合动力显示出卓越的循环稳定性，在5 A g−1下超过5000次循环的容量保持率为96.9%。这种卓越的电化学性能主要归因于RuO 2的利用率显著提高，这是通过微小的还原CQD的有效分散和基于CQD的混合网络结构的形成来实现的，该混合网络结构可以促进充电-放电过程中的快速电荷传输和离子运动。此外，在活性材料和集流体之间的界面处的接触电阻的结论是在确定的混合的性能的关键因素。这些结果表明，CQD基杂化材料在开发超级电容器高性能电极材料方面具有巨大的潜力。
Carbon quantum dots (CQDs) due to their unique properties have recently attracted extensive attention from researchers in many fields. In the present work, a new application in the form of a CQD-based hybrid as an excellent electrode material for supercapacitors is reported for the first time. The CQDs are fabricated by a facile chemical oxidation method following which they are thermally reduced, and further decorated with RuO2 to obtain the composites. The hybrid exhibits a specific capacitance of 460 F g−1 at an ultrahigh current density of 50 A g−1 (41.9 wt% Ru loading), and excellent rate capability (88.6, 84.2, and 77.4% of capacity retention rate at 10, 20, and 50 A g−1 compared with 1 A g−1, respectively). Surprisingly, the hybrid shows exceptional cycling stability with 96.9% capacity retention over 5000 cycles at 5 A g−1. Such remarkable electrochemical performances can be primarily ascribed to the significantly enhanced utilization of RuO2 achieved by the efficient dispersion of tiny reduced CQDs and the formation of a CQD-based hybrid network structure that can facilitate the fast charge transport and ionic motion during the charge–discharge process. Additionally, the contact resistance at the interface between active materials and current collectors is concluded to be a key factor in determining the performance of the hybrid. These results above demonstrate the great potential of CQD-based hybrid materials in the development of high-performance electrode materials for supercapacitors.
登录
查看更多内容
影响因子：
3.7
作者：
Mishra, Ashish Kumar;Ramaprabhu, Sundara
通讯作者：
Ramaprabhu, Sundara
影响因子：
3.9
作者：
Hu, CC;Chen, WC;Chang, KH
通讯作者：
Chang, KH
影响因子：
17.1
作者：
Williams, Graeme;Seger, Brian;Kamat, Prashant V.
通讯作者：
Kamat, Prashant V.
影响因子：
13.3
作者：
Jianshan Ye;Hui Cui;Xiao Liu;T. Lim;Wei‐De Zhang;F. Sheu
通讯作者：
Jianshan Ye;Hui Cui;Xiao Liu;T. Lim;Wei‐De Zhang;F. Sheu
影响因子：
--
作者：
Rakhi, R. B.;Chen, Wei;Alshareef, H. N.
通讯作者：
Alshareef, H. N.