State Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, School of Materials Science & Engineering, School of Physics , Sun Yat-sen University , Guangzhou 510275 , Guangdong , P. R. China.
ACS Appl Mater Interfaces. 2018 Jun 20;10(24):20688-20695. doi: 10.1021/acsami.8b04609. Epub 2018 Jun 5.
Because of the poor specific capacitance of transparent and flexible supercapacitors reported recently, exploring electrode materials with high electrochemical properties for such devices is still a big challenge. We reported that the NiVO@PANI composite has been synthesized using an in situ chemical bath method. It was found that the synthesized NiVO@PANI composite has outstanding electrochemical behaviors (specific capacitance value of 2565.7 F/g at 5 mV/s, wide potential window, good rate capability), which are much superior to those of NiVO and PANI electrodes. The improved electrochemical behaviors result from the synergistic effect between NiVO and PANI. A symmetric flexible and transparent supercapacitor was fabricated using the NiVO@PANI composite as the working electrode. The device demonstrated a maximum areal capacitance of 58.5 mF/cm at 5 mV/s and an energy density of 20.8 μW h/cm with 1.6 V potential window. Furthermore, the capacitance retained nearly 88% of its original value after 20 000 galvanostatic charging and discharging cycles. These results favor the promising potential of the NiVO@PANI composite as the electrode material for the application in flexible and transparent supercapacitors.
由于最近报道的透明和柔性超级电容器的比电容较差，因此为这类器件探索具有高电化学性能的电极材料仍然是一个巨大的挑战。我们报道了使用原位化学浴法合成了 NiVO@PANI 复合材料。研究发现，所合成的 NiVO@PANI 复合材料具有出色的电化学性能（在 5 mV/s 时的比电容值为 2565.7 F/g，宽电位窗口，良好的倍率性能），优于 NiVO 和 PANI 电极。改进的电化学性能源于 NiVO 和 PANI 之间的协同效应。使用 NiVO@PANI 复合材料作为工作电极，制备了对称的柔性透明超级电容器。该器件在 5 mV/s 时的最大面电容为 58.5 mF/cm，在 1.6 V 电位窗口下的能量密度为 20.8 μW h/cm。此外，在 20000 次恒流充放电循环后，电容保持了其原始值的近 88%。这些结果表明，NiVO@PANI 复合材料作为用于柔性透明超级电容器的电极材料具有很大的应用潜力。
