Bongu Chandra Sekhar, Krishnan Mohan Raj, Soliman Abdelrahman, Arsalan Muhammad, Alsharaeh Edreese H
College of Science and General Studies, Alfaisal University, P.O. Box 50927, Riyadh 11533, Saudi Arabia.
EXPEC Advanced Research Center, Saudi Aramco, P.O. Box 5000, Dhahran 31311, Saudi Arabia.
ACS Omega. 2023 Sep 29;8(40):36789-36800. doi: 10.1021/acsomega.3c03370. eCollection 2023 Oct 10.
Two-dimensional atomically thick materials such as graphene and layered molybdenum disulfide (MoS) have been studied as potential energy storage materials because of their high specific surface area, potential redox activity, and mechanical flexibility. However, because of the layered structure restacking and poor electrical conductivity, these materials are unable to attain their full potential. Composite electrodes made of a mixture of graphene and MoS have been shown to partially resolve these issues in the past, although their performance is still limited by inadequate mixing at the nanoscale. Herein, we report three composites via a simple ball-milling method and analyze supercapacitor electrodes. Compared with pristine graphene and MoS, the composites showed high capacitance. The as-obtained MoS@Graphene composite (1:9) possesses a high surface area and uniform dispersion of MoS on the graphene sheet. The MoS@Graphene (1:9) composite electrode has a high specific capacitance of 248 F g at 5 A g in an electrochemical supercapacitor compared with the other two composites. Simultaneously, the flexible symmetric supercapacitor device prepared demonstrated superior flexibility and a long lifespan (93% capacitance retention after 8000 cycles) with no obvious changes in performance under different angles. In portable and wearable energy storage devices, the current experimental results will result in scalable, freestanding hybrid electrodes with improved, flexible, supercapacitive performance.
二维原子厚度的材料，如石墨烯和层状二硫化钼（MoS），因其高比表面积、潜在的氧化还原活性和机械柔韧性，已被作为潜在的储能材料进行研究。然而，由于层状结构的重新堆叠和导电性差，这些材料无法充分发挥其潜力。过去已证明，由石墨烯和MoS混合物制成的复合电极能部分解决这些问题，尽管其性能仍受限于纳米级混合不充分。在此，我们通过一种简单的球磨法报告了三种复合材料，并对超级电容器电极进行了分析。与原始石墨烯和MoS相比，这些复合材料显示出高电容。所制备的MoS@石墨烯复合材料（1:9）具有高表面积，且MoS在石墨烯片上均匀分散。与其他两种复合材料相比，MoS@石墨烯（1:9）复合电极在电化学超级电容器中，在5 A g的电流密度下具有248 F g的高比电容。同时，所制备的柔性对称超级电容器器件表现出优异的柔韧性和长寿命（8000次循环后电容保持率为93%），在不同角度下性能无明显变化。在便携式和可穿戴储能设备中，当前的实验结果将产生具有改进的、柔性的、超级电容性能的可扩展的独立混合电极。
