Polypyrrole (PPy) electrodes with favorable pseudocapacitance are rapidly developed for supercapacitor. However, longer PPy electrodes are usually underutilized, which affects their capacitances. Herein, rectangular textile-based electrodes, PPy/knitted cotton fabric (PKCF), is fabricated via in-situ polymerization, and the effects of electrodes length on their capacitances are investigated. To improve capacitances of longer PKCF, a center current collecting method is proposed, which enhances 46.8% capacitance for the PKCF at 20 mA. Besides, the capacitance of PKCF is further improved from 5190 to 6950 mF (at 4 mA) via a means of multi-points current collecting. According to the results, a reduced potential decrease mechanism is put forward to explain the enhanced capacitances. The obvious differences of device capacitances (1985-100 mF, 3440-2125 mF and 3750-2900 mF at 4–20 mA, based on end, center and multi-points current collecting, respectively) indicate the proposed latter two methods are effective to make more utilization of PKCF, which is instructive for the practical application of longer electrodes and corresponding devices.

具有良好的伪电容的聚吡咯（PPy）电极正在迅速发展为超级电容器。但是，较长的PPy电极通常未得到充分利用，这会影响其电容。在此，通过原位聚合制备矩形纺织基电极，即PPy /针织棉织物（PKCF），并研究电极长度对其电容的影响。为了改善较长PKCF的电容，提出了一种中心集流方法，该方法可在20 mA时提高PKCF的46.8％电容。此外，通过多点电流收集，PKCF的电容从5190 mF（在4 mA下）进一步提高到6950 mF。根据结果​​，提出了减小电势减小的机制来解释增强的电容。器件电容（1985-100 mF，