Zequine Camila, Ranaweera C K, Wang Z, Dvornic Petar R, Kahol P K, Singh Sweta, Tripathi Prashant, Srivastava O N, Singh Satbir, Gupta Bipin Kumar, Gupta Gautam, Gupta Ram K
Department of Chemistry, Pittsburg State University, 1701 S. Broadway, Pittsburg, Kansas, 66762, USA.
Department of Physics, Pittsburg State University, 1701 S. Broadway, Pittsburg, Kansas, 66762, USA.
Sci Rep. 2017 Apr 26;7(1):1174. doi: 10.1038/s41598-017-01319-w.
In search of affordable, flexible, lightweight, efficient and stable supercapacitors, metal oxides have been shown to provide high charge storage capacity but with poor cyclic stability due to structural damage occurring during the redox process. Here, we develop an efficient flexible supercapacitor obtained by carbonizing abundantly available and recyclable jute. The active material was synthesized from jute by a facile hydrothermal method and its electrochemical performance was further enhanced by chemical activation. Specific capacitance of 408 F/g at 1 mV/s using CV and 185 F/g at 500 mA/g using charge-discharge measurements with excellent flexibility (~100% retention in charge storage capacity on bending) were observed. The cyclic stability test confirmed no loss in the charge storage capacity of the electrode even after 5,000 charge-discharge measurements. In addition, a supercapacitor device fabricated using this carbonized jute showed promising specific capacitance of about 51 F/g, and improvement of over 60% in the charge storage capacity on increasing temperature from 5 to 75 °C. Based on these results, we propose that recycled jute should be considered for fabrication of high-performance flexible energy storage devices at extremely low cost.
为了寻找价格实惠、灵活、轻便、高效且稳定的超级电容器，金属氧化物已被证明具有高电荷存储容量，但由于在氧化还原过程中发生结构损伤，其循环稳定性较差。在此，我们通过碳化大量可得且可回收的黄麻开发了一种高效的柔性超级电容器。活性材料通过简便的水热法由黄麻合成，并且通过化学活化进一步提高了其电化学性能。使用循环伏安法在1 mV/s时比电容为408 F/g，使用充放电测量在500 mA/g时比电容为185 F/g，具有出色的柔韧性（弯曲时电荷存储容量保留约100%）。循环稳定性测试证实，即使经过5000次充放电测量，电极的电荷存储容量也没有损失。此外，使用这种碳化黄麻制造的超级电容器装置显示出约51 F/g的有前景的比电容，并且在温度从5℃升高到75℃时电荷存储容量提高了60%以上。基于这些结果，我们建议应考虑使用回收黄麻以极低的成本制造高性能柔性储能装置。
