Mixed‐phase MoS2 decorated reduced graphene oxide hybrid composites for efficient symmetric supercapacitors,International Journal of Energy Research

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Mixed‐phase MoS2 decorated reduced graphene oxide hybrid composites for efficient symmetric supercapacitors
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-01-28 , DOI: 10.1002/er.6448
Dhanasekaran Vikraman ₁ , Iqra Rabani ₂ , Sajjad Hussain _{2,

3} , K. Sundaram ₄ , Sivalingam Ramesh ₅ , Heung‐Soo Kim ₅ , Young‐Soo Seo ₂ , Jongwan Jung _{2,

3} , Hyun‐Seok Kim ₁

Affiliation

In this work, we demonstrated the phase‐tuned MoS₂ layers (2H‐ MoS₂, 1 T‐ MoS₂, and 2H/1 T‐MoS₂) using a one‐pot reaction, scientifically significant due to their impermeable characteristics. Strongly‐bonded, vertically‐aligned layers were perceived by transmission electron microscopy (TEM) for 2H/1 T‐MoS₂ layers. The spacing between the two layers was expanded to 0.67 nm, which is favorable for intercalation process. Further, mixed‐phase MoS₂ sheets were successively blended with reduced graphene oxide (rGO) to form 2H/1 T‐MoS₂@rGO hybrid. Spectroscopic studies verified the formation of phase‐tuned MoS₂ and 2H/1 T‐MoS₂@rGO hybrid. The resulting 2H/1 T‐MoS₂@rGO hybrid TEM micrograph shows the layered MoS₂ lattices decorated rGO nano‐structure. Symmetric supercapacitors constructed from 2H/1 T‐MoS₂@rGO hybrid electrodes demonstrated improved storage capacity with solid pseudo‐capacitive behavior compared to the pure phases. Surface‐modified 2H/1 T‐MoS₂@rGO nanostructures exhibited a high energy density of 55 Wh·kg⁻¹ at a power density of 3 kW·kg⁻¹ with a symmetric capacitance of 275 F·g⁻¹ at a current density of 1 A·g⁻¹, along with an excellent cyclic constancy (~97% capacity after 5000 cycles).

中文翻译：

混合相MoS2装饰的还原石墨烯氧化物杂化复合材料，用于高效对称超级电容器

在这项工作中，我们展示了相位调谐的MoS ₂层（2H-的MoS ₂，1 T-的MoS ₂，和2H / 1 T-的MoS ₂使用一锅反应，科学显著由于其不可渗透特性）。透射电子显微镜（TEM）观察到2H / 1 T-MoS ₂层的牢固结合，垂直排列的层。两层之间的间距扩大到0.67 nm，这有利于插层工艺。此外，将混合相的MoS ₂薄板与还原的氧化石墨烯（rGO）连续混合，形成2H / 1 T-MoS ₂ @rGO杂化物。光谱研究证实了相调MoS ₂和2H / 1 T-MoS的形成₂ @rGO混合。生成的2H / 1 T-MoS ₂ @rGO混合TEM显微照片显示了层状MoS ₂晶格装饰的rGO纳米结构。与纯相相比，由2H / 1 T-MoS ₂ @rGO混合电极构成的对称超级电容器表现出更高的存储容量，具有可靠的伪电容特性。经表面修饰的2H / 1 T-MoS ₂ @rGO纳米结构在3 kW·kg ^-1的功率密度下具有55 Wh·kg ^-1的高能量密度，在电流下的对称电容为275 F·g ^-1。密度为1 A·g ^-1，循环稳定性极佳（5000次循环后容量约为97％）。

更新日期：2021-01-28

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