Ur Rahman Sami, Röse Philipp, Ul Haq Ali Shah Anwar, Krewer Ulrike, Bilal Salma, Farooq Shehna
National Centre of Excellence in Physical Chemistry 1, University of Peshawar, Peshawar 25120, Pakistan.
Karlsruhe Institute of Technology (KIT), Institute for Applied Materials-Electrochemical Technologies (IAM-ET), 76131 Karlsruhe, Germany.
Polymers (Basel). 2021 Jul 15;13(14):2329. doi: 10.3390/polym13142329.
The performance of high-rate supercapacitors requires fine morphological and electrical properties of the electrode. Polyaniline (PANI), as one of the most promising materials for energy storage, shows different behaviour on different substrates. The present study reports on the surface modification of fluorine doped tin oxide (FTO) with the sodium phytate doped PANI without any binder and its utilization as a novel current collector in symmetric supercapacitor devices. The electrochemical behaviour of the sodium phytate doped PANI thin film with and without a binder on fluorine doped tin oxide (FTO) as current collector was investigated by cyclic voltammetry (CV). The electrode without a binder showed higher electrocatalytic efficiency. A symmetrical cell configuration was therefore constructed with the binder-free electrodes. The device showed excellent electrochemical performance with high specific capacities of 550 Fg at 1 Ag and 355 Fg at 40 Ag calculated from galvanostatic discharge curves. The low charge transfer and solution resistances (R and R) of 7.86 Ωcm² and 3.58 × 10 Ωcm², respectively, and superior rate capability of 66.9% over a wide current density range of 1 Ag to 40 Ag and excellent cycling stability with 90% of the original capacity over 1000 charge/discharge cycles at 40 Ag, indicated it to be an efficient energy storage device. Moreover, the gravimetric energy and power density of the supercapacitor was remarkably high, providing 73.8 Whkg at 500 Wkg, respectively. The gravimetric energy density remained stable as the power density increased. It even reached up to 49.4 Whkg at a power density of up to 20 Wkg.
高倍率超级电容器的性能要求电极具有良好的形态和电学性能。聚苯胺（PANI）作为最有前途的储能材料之一，在不同的基底上表现出不同的行为。本研究报道了用植酸钠掺杂的聚苯胺对氟掺杂氧化锡（FTO）进行表面改性，且不使用任何粘结剂，并将其用作对称超级电容器器件中的新型集流体。通过循环伏安法（CV）研究了在氟掺杂氧化锡（FTO）作为集流体的情况下，有粘结剂和无粘结剂的植酸钠掺杂聚苯胺薄膜的电化学行为。无粘结剂的电极表现出更高的电催化效率。因此，用无粘结剂的电极构建了对称电池结构。该器件表现出优异的电化学性能，根据恒电流放电曲线计算，在1 A/g时的比电容为550 F/g，在40 A/g时为355 F/g。其电荷转移电阻和溶液电阻（Rct和Rs）分别低至7.86 Ω·cm²和3.58×10⁻² Ω·cm²，在1 A/g至40 A/g的宽电流密度范围内具有66.9%的优异倍率性能，在40 A/g下经过1000次充放电循环后仍保持90%的初始容量，具有出色的循环稳定性，表明它是一种高效的储能器件。此外，该超级电容器的重量能量密度和功率密度非常高，分别在500 W/kg时提供73.8 Wh/kg。随着功率密度的增加，重量能量密度保持稳定。在高达2000 W/kg的功率密度下，它甚至达到了49.4 Wh/kg。
