Raman Vivekanandan, Rhee Dongjoon, Selvaraj Aravindha Raja, Kim Jihyun, Prabakar Kandasamy, Kang Joohoon, Kim Han-Ki
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, South Korea.
School of Electrical Engineering, Pusan National University, Busan, South Korea.
Sci Technol Adv Mater. 2021 Oct 13;22(1):875-884. doi: 10.1080/14686996.2021.1978274. eCollection 2021.
Two-dimensional molybdenum disulfide (MoS) nanosheets have emerged as a promising material for transparent, flexible micro-supercapacitors, but their use in electrodes is hindered by their poor electrical conductivity and cycling stability because of restacking. In this paper, we report a novel electrode architecture to exploit electrochemical activity of MoS nanosheets. Electrochemically exfoliated MoS dispersion was spin coated on mesh-like silver networks encapsulated with a flexible conducting film exhibiting a pseudocapacitive behavior. MoS nanosheets were electrochemically active over the whole electrode surface and the conductive layer provided a pathway to transport electrons between the MoS and the electrolyte. As the result, the composite electrode achieved a large areal capacitance (89.44 mF cm at 6 mA cm) and high energy and power densities (12.42 µWh cm and = 6043 µW cm at 6 mA cm) in a symmetric cell configuration with 3 M KOH solution while exhibiting a high optical transmittance of ~80%. Because the system was stable against mechanical bending and charge/discharge cycles, a flexible micro-supercapacitor that can power electronics at different bending states was realized.
二维二硫化钼（MoS₂）纳米片已成为用于透明、柔性微型超级电容器的一种很有前景的材料，但其在电极中的应用因重新堆叠导致的导电性差和循环稳定性不佳而受到阻碍。在本文中，我们报告了一种利用MoS₂纳米片电化学活性的新型电极结构。将电化学剥离的MoS₂分散体旋涂在由具有赝电容行为的柔性导电膜封装的网状银网络上。MoS₂纳米片在整个电极表面具有电化学活性，导电层提供了一条在MoS₂和电解质之间传输电子的途径。结果，该复合电极在具有3M KOH溶液的对称电池配置中实现了大的面积电容（在6 mA cm⁻²时为89.44 mF cm⁻²）以及高能量和功率密度（在6 mA cm⁻²时分别为12.42 μWh cm⁻²和6043 μW cm⁻²），同时表现出约80%的高光学透过率。由于该系统在机械弯曲和充放电循环方面稳定，因此实现了一种能够在不同弯曲状态下为电子设备供电的柔性微型超级电容器。
