Beg Mustehsan, Alcock Keith M, Titus Mavelil Achu, O'Rourke Dominic, Sun Dongyang, Goh Keng, Manjakkal Libu, Yu Hongnian
School of Computing and Engineering & the Built Environment, Edinburgh Napier University, Merchiston Campus, EH10 5DT Edinburgh, U.K.
ACS Appl Mater Interfaces. 2023 Oct 28;15(44):51100-9. doi: 10.1021/acsami.3c11005.
Flexible and green energy storage devices have a wide range of applications in prospective electronics and connected devices. In this study, a new eco-friendly bilayer separator and primary and secondary paper supercapacitors based on manganese dioxide (MnO)/carbon black (CB) are developed. The bilayer separator is prepared via a two-step fabrication process involving freeze-thawing and nonsolvent-induced phase separation. The prepared bilayer separator exhibits superior porosity of 46%, wettability of 46.5°, and electrolyte uptake of 194% when compared with a Celgard 2320 trilayer separator (39%, 55.58°, and 110%). Moreover, lower bulk resistance yields a higher ionic conductivity of 0.52 mS cm in comparison to 0.22 mS cm for the Celgard separator. Furthermore, the bilayer separator exhibits improved mean efficiency of 0.44% and higher specific discharge capacitance of 13.53%. The anodic and cathodic electrodes are coated on a paper substrate using MnO/CB and zinc metal-loaded CB composites. The paper supercapacitor demonstrates a high specific capacitance of 34.1 mF cm and energy and power density of 1.70 μWh cm and 204.8 μW cm at 500 μA, respectively. In summary, the concept of an eco-friendly bilayer cellulose separator with paper-based supercapacitors offers an environmentally friendly alternative to traditional energy storage devices.
柔性绿色储能器件在未来电子和互联设备中有着广泛的应用。在本研究中，开发了一种新型的基于二氧化锰（MnO）/炭黑（CB）的环保型双层隔膜以及一次和二次纸质超级电容器。该双层隔膜通过包括冻融和非溶剂诱导相分离的两步制造工艺制备而成。与Celgard 2320三层隔膜（孔隙率39%、润湿性55.58°、电解液吸收率110%）相比，所制备的双层隔膜具有46%的优异孔隙率、46.5°的润湿性和194%的电解液吸收率。此外，与Celgard隔膜的0.22 mS cm相比，更低的体积电阻产生了0.52 mS cm的更高离子电导率。此外，双层隔膜表现出0.44%的更高平均效率和13.53%的更高比放电电容。阳极和阴极电极使用MnO/CB和锌金属负载的CB复合材料涂覆在纸质基底上。纸质超级电容器在500 μA时分别表现出34.1 mF cm的高比电容以及1.70 μWh cm和204.8 μW cm的能量和功率密度。总之，具有纸质超级电容器的环保型双层纤维素隔膜概念为传统储能器件提供了一种环境友好的替代方案。
