材料科学
超级电容器
石墨烯
电容
纳米技术
电流密度
储能
功率密度
双金属片
化学工程
纳米柱
碳纤维
复合数
纳米结构
电极
复合材料
化学
金属
功率(物理)
物理
工程类
物理化学
量子力学
冶金
作者
Gopinath Sahoo,Hyeon Seo Jeong,S. R. Polaki,Sang Mun Jeong
标识
DOI:10.1016/j.est.2023.107824
摘要
Vertical graphene nanosheets (VGN), also known as vertical-oriented graphene or carbon nanowalls emerge recently for different energy storage devices by virtue of their interesting properties that enable them to bring out as excellent current-collector and templates for the growth of different nanostructures. In the current research, we design the facile synthesis of nano-sized bimetallic NiCo MOF on VGN (NiCo MOF/VGN) to achieve improved storage performance. The enhanced capacitive contribution, wetting nature, and charge-transfer kinetics of NiCo MOF/VGN facilitate an increase in the energy-storage performance in the case of an in-situ (solvothermal) method than the drop-cast method. Further, the comparison also confirms that VGN acts as an excellent current collector for NiCo MOF than carbon paper. Due to the unique morphology of VGN and nano rod-like NiCo MOF structure, the NiCo MOF/VGN composite delivers a specific capacity of 132 mA h g−1 (475 C g−1) and a specific capacitance of 950 F g−1 at 1 A g−1 with a high rate capability of 93.2 % at 10 A g−1. Moreover, the assembled asymmetric solid-state supercapacitor device (NiCo MOF/VGN//PVA + KOH//activated carbon) exhibited a high energy density of 58.1 Wh kg−1 at a power density of 1170 W kg−1 and a high power density of 7 kW kg−1 at an energy density of 36.5 Wh kg−1 with a cycle stability of 88.5 % after 10,000 cycles of charge-discharge.
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