Energy Storage and Conversion Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641046, Tamil Nadu, India.
Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, South Korea.
J Colloid Interface Sci. 2019 Oct 15;554:142-156. doi: 10.1016/j.jcis.2019.06.081. Epub 2019 Jun 25.
An ever-increasing demand for energy coupled with environmental pollution associated with conventional energy production continues to drive the search for alternative renewable energy storage solutions. In this regard, a high surface area (1841 m g), hierarchically porous (∼1.18 cm g) and self-inherited nitrogen (2.1 at.wt%) based activated carbon are obtained from Artocarpus heterophyllus seed derived starch as a result of ZnCl chemical activation. A flexible, conductive, thermally stable and bio-degradable biopolymer electrolyte film is prepared from Manihot esculenta starch powder. These eco-friendly hierarchically porous architectured carbon electrode and flexible biopolymer electrolytes are employed as significant components in a coin cell-based all-solid-state supercapacitor. The resulting device delivers a high specific capacitance of 240 Fg at 0.5 mA with 97% coulombic efficiency over 2000 cycles. In addition, the device provided excellent specific energy (17 Wh kg) and specific power (3823 W kg). Interestingly, the starch derived biopolymer electrolyte film, when buried under soil, shows a favourable natural rate of degradation. Therefore, this fabricated electric double layer capacitor can be used as a promising device with little to no potential environmental harm.
随着人们对能源的需求不断增加，以及传统能源生产所带来的环境污染，寻找替代可再生能源存储解决方案的需求也在不断增长。在这方面，我们从腰果种子衍生的淀粉中通过 ZnCl2 化学活化得到了一种具有高比表面积（1841 m2/g）、分级多孔结构（~1.18 cm3/g）和自继承氮（2.1 原子%）的活性炭。我们还从木薯淀粉粉末中制备了一种灵活、导电、热稳定和可生物降解的生物聚合物电解质薄膜。这些环保型分级多孔结构的碳电极和灵活的生物聚合物电解质作为重要组件被用于基于硬币电池的全固态超级电容器中。该器件的比电容高达 240 F/g，在 0.5 mA 时的能量效率为 97%，在 2000 次循环中保持了 97%的库仑效率。此外，该器件还提供了出色的比能量（17 Wh/kg）和比功率（3823 W/kg）。有趣的是，源自淀粉的生物聚合物电解质薄膜在埋入土壤后显示出有利的自然降解速率。因此，这种制备的电化学双层电容器可以作为一种很有前途的器件，几乎不会对环境造成潜在危害。
