Kesavan Dhanasekar, Mariappan Vimal Kumar, Pazhamalai Parthiban, Krishnamoorthy Karthikeyan, Kim Sang-Jae
Nanomaterials and System Laboratory, Major of Mechatronics Engineering, Faculty of Applied Energy System, Jeju National University, Jeju 63243, Republic of Korea.
Nanomaterials and System Laboratory, Major of Mechatronics Engineering, Faculty of Applied Energy System, Jeju National University, Jeju 63243, Republic of Korea; Department of Advanced Convergence Science and Technology, Jeju National University, Jeju 63243, Republic of Korea.
J Colloid Interface Sci. 2021 Feb 15;584:714-722. doi: 10.1016/j.jcis.2020.09.088. Epub 2020 Sep 28.
This work describes the formation of two-dimensional molybdenum di-sulfide (MoS) nanosheets via topochemical sulfurization of MoO microplates and its applications towards wide-temperature tolerant supercapacitors. Physico-chemical characterizations such as XRD, FE-SEM, HR-TEM, XPS and elemental mapping analysis revealed the formation of MoS nanosheets with lateral size in the range of 200 nm. The electrochemical properties of the MoS electrode using three-electrode configuration tests revealed the presence of pseudocapacitive mechanism of charge-storage with a high capacitance (119.38 F g) from cyclic voltammetry profiles and superior cyclic stability of 95.1% over 2000 cycles. The symmetric supercapacitor (SSC) fabricated using MoS electrodes delivered a high-energy density (6.56 Wh kg) and high-power density (2500 W kg) with long cycle life. The electrochemical performance of the MoS SSC exhibited ~121% improvement at 80 °C compared to that achieved at 20 °C and the mechanism of improved properties were examined with the use of electrochemical impedance spectroscopy. These experimental results indicate usefulness of topochemically synthesized MoS for construction of wide-temperature tolerant supercapacitors that can be useful in a variety of industrial sectors.
这项工作描述了通过MoO微板的拓扑化学硫化形成二维二硫化钼（MoS）纳米片及其在宽温耐受超级电容器中的应用。XRD、FE-SEM、HR-TEM、XPS和元素映射分析等物理化学表征揭示了横向尺寸在200 nm范围内的MoS纳米片的形成。使用三电极配置测试的MoS电极的电化学性能通过循环伏安曲线揭示了存在具有高电容（119.38 F g）的赝电容电荷存储机制，并且在2000次循环中具有95.1%的优异循环稳定性。使用MoS电极制造的对称超级电容器（SSC）具有高能量密度（6.56 Wh kg）和高功率密度（2500 W kg）以及长循环寿命。与在20°C时相比，MoS SSC的电化学性能在80°C时提高了约121%，并使用电化学阻抗谱研究了性能改善的机制。这些实验结果表明拓扑化学合成的MoS对于构建可用于各种工业领域的宽温耐受超级电容器是有用的。
