Fig. 1. (a) Scanning electron microscope (SEM) image of CNTA; (b) SEM image of CNTA after hydrogel embedding.(a)垂直取向碳纳米管阵列SEM图; (b)水凝胶包埋后碳管阵列图

Fig. 2. Schematic of the fabrication of neutral hydrogel/CNTA composite flexible solid state supercapacitor.中性水凝胶复合碳纳米管阵列柔性固态超级电容器的制备流程图

Fig. 3. Electrochemical performance test of PVA-CH₃COONa/CNTA composite device: (a) CV curves at different scan rates ranging from 10 to 200 mV/s; (b) instantaneous capacitance diagram at different scan rates; (c) galvanostatic charge-discharge (GCD) curves at different current densities (0.51–10.2 mA·cm^–3); (d) evolution of specific capacitance versus current density; (e) Nyquist plot of the device at a frequency range from 0.01 to 100k Hz; (f) cyclic stability of the device during 5000 charging-discharging cycles. PVA-CH₃COONa/CNTA复合器件的电化学性能测试　(a) 10−200 mV/s扫速下循环伏安曲线(CV); (b)不同扫速下的瞬时电容图; (c) 0.51−10.2 mA·cm^–3不同电流密度下的恒流充放电曲线(GCD); (d)比电容随电流密度变化图; (e) 0.01−100k Hz频率下器件EIS; (f)5000次循环充放电下器件稳定图

Fig. 4. (a)−(c) The original flexible device, bend and recovery processes, respectively; (d) CV curves comparison of the flexible device before and after being bent over 80 times at 50 mV/s scan rate.(a)柔性器件图; (b)和(c)为弯曲前后器件图; (d)弯曲80次前后器件CV曲线对比图

Fig. 5. Comparison of electrochemical properties of different neutral gel/CNTA composite devices: (a) CV comparison diagram at 50 mV/s scan rate; (b) GCD comparison diagram at 5.1 mA·cm^–3 current density; (c) EIS Nyquist plots obtained from the electrochemical impedance test for different samples; (d) Ragone plots of the different samples; (e) the cyclic performances of the different samples for 5000 cycles. (a) 50 mV/s扫速下CV对比图; (b) 5.1 mA·cm^–3电流密度下GCD对比图; (c) EIS对比图; (d)能量-功率密度对比图; (e) 5000次循环稳定性对比图

Fig. 6. Comparison of electrochemical properties of PVA-NaCl/CNTA and PVA-NaCl/CCNT composite devices: (a) CV comparison diagram at 50 mV/s scan rate; (b) GCD comparison diagram at 0.69 mA·cm^–2 current density; (c) diagram of specific capacitance changing with current density; (d) EIS comparison diagram at high frequency. PVA-NaCl/CNTA和PVA-NaCl/CCNT复合器件的电化学性能测试对比　(a) 50 mV/s扫速下CV对比图; (b) 0.69 mA·cm^–2电流密度下GCD对比图; (c)比电容随电流密度变化图; (d)高频下EIS对比图

Fig. 7. Electrochemical performance test of PVA-NaCl/CNTA composite device: (a) CV curves in different voltages ranging from 0.8 to 1.6 V at 50 mV/s scan rate; (b) high-potential CV curves over the scan rates ranging from 10 to 200 mV/s; (c) self-discharge comparison diagram based on CNTA and CCNT respectively.PVA-NaCl/CNTA复合器件的电化学性能测试　(a) 50 mV/s扫速下0.8−1.6 V不同电压范围内CV曲线图; (b) 10−200 mV/s扫速下高电位CV曲线图; (c) 分别基于取向阵列和碳管粉末的器件自放电对比图