Zhao Guoqing, Tang Yulin, Wan Gengping, Xu Xuefei, Zhou Xuechun, Zhou Maofan, Hao Chuncheng, Deng Shengjue, Wang Guizhen
Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, PR China; Institute of Advanced Electrical Materials, Qingdao University of Science and Technology, Qingdao 266042, PR China.
Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Haikou 570228, PR China.
J Colloid Interface Sci. 2020 Jul 15;572:151-159. doi: 10.1016/j.jcis.2020.03.084. Epub 2020 Mar 24.
The exploration of flexible supercapacitors with high energy density is a matter of considerable interest to meet the demand of wearable electronic devices. In this work, with carbon nanotubes (CNTs) grown on carbon cloth (CC) as flexible substrate, NiCoP nanoflake-surrounded CNT nanoarrays (NiCoP/CNT) and N-doped carbon coated CNT nanoarrays (CNT@N-C) were synthesized on CC and utilized as cathode and anode materials for constructing flexible all-solid-state hybrid supercapacitor. Both them exhibit excellent electrochemical performance. NiCoP/CNT/CC composites can deliver a specific capacitance of 261.4 mAh g, and CNT@N-C/CC exhibits a high capacitance of 256 F g at the current density of 0.5 A g. The hybrid supercapacitor built from the two well designed electrodes can provide a specific capacitance of 123.3 mAh g at current density 1 mA g within a potential window of 0-1.5 V and retain almost 85% of its initial capacitance after 5000 cycles. Furthermore, the flexible devices show the maximum energy density of 138.7 Wh kg and a power density of 6.25 kW kg, obviously superior to some recent reported supercapacitor devices, indicating its potential in practical application.
探索具有高能量密度的柔性超级电容器以满足可穿戴电子设备的需求是一个备受关注的问题。在这项工作中，以生长在碳布（CC）上的碳纳米管（CNT）为柔性基底，在CC上合成了NiCoP纳米片包围的CNT纳米阵列（NiCoP/CNT）和N掺杂碳包覆的CNT纳米阵列（CNT@N-C），并将其用作构建柔性全固态混合超级电容器的阴极和阳极材料。它们都表现出优异的电化学性能。NiCoP/CNT/CC复合材料在电流密度为0.5 A g时可提供261.4 mAh g的比电容，而CNT@N-C/CC在电流密度为0.5 A g时表现出256 F g的高电容。由这两个精心设计的电极构建的混合超级电容器在0-1.5 V的电位窗口内，在电流密度为1 mA g时可提供123.3 mAh g的比电容，并且在5000次循环后仍保留其初始电容的近85%。此外，该柔性器件显示出138.7 Wh kg的最大能量密度和6.25 kW kg的功率密度，明显优于最近报道的一些超级电容器器件，表明其在实际应用中的潜力。
