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⁻¹, and CNT@N-C/CC exhibits a high capacitance of 256 F g⁻¹ at the current density of 0.5 A g⁻¹. The hybrid supercapacitor built from the two well designed electrodes can provide a specific capacitance of 123.3 mAh g⁻¹ at current density 1 mA g⁻¹ 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⁻¹ and a power density of 6.25 kW kg⁻¹, obviously superior to some recent reported supercapacitor devices, indicating its potential in practical application.

为了满足可穿戴电子设备的需求，探索具有高能量密度的柔性超级电容器是相当有意义的事情。在这项工作中，以生长在碳布（CC）上的碳纳米管（CNT）作为柔性基板，在CC和碳纳米管上合成了NiCoP纳米片包围的CNT纳米阵列（NiCoP / CNT）和N掺杂碳涂覆的CNT纳米阵列（CNT @ NC）。用作制造柔性全固态混合超级电容器的正极和负极材料。它们都表现出优异的电化学性能。NiCoP / CNT / CC复合材料可提供261.4 mAh g ^-1的比电容，而CNT @ NC / CC在0.5 A g ^-1的电流密度下可显示256 F g ^-1的高电容。。由两个设计合理的电极构成的混合超级电容器可在0-1.5 V的电位窗口内以1 mA g ^-1的电流密度提供123.3 mAh g ^-1的比电容，并在5000次循环后保留其初始电容的几乎85％ 。此外，柔性器件的最大能量密度为138.7 Wh kg ^-1，功率密度为6.25 kW kg ^-1，明显优于一些最近报道的超级电容器器件，表明其在实际应用中的潜力。