超级电容器
非阻塞I/O
纳米复合材料
纳米技术
材料科学
化学工程
电容
电解质
煅烧
法拉第效率
电化学
化学
电极
催化作用
生物化学
工程类
物理化学
作者
Sheng Qiang Zheng,Siew Shee Lim,Chuan Yi Foo,Choon Yian Haw,Wee Siong Chiu,Chin Hua Chia,Poi Sim Khiew
标识
DOI:10.1016/j.est.2023.106980
摘要
Transition metal oxides and carbonaceous nanocomposites have triggered enormous interest in the application of high-performance supercapacitors due to the outstanding electrical conductivity and superior theoretical capacitance. In this study, we prepared highly porous nanostructured NiO/C yolk-shell nanocomposites via a simple calcination of nickel-based metal-organic frameworks. The porosity and electrochemical property were further enhanced by incorporating sodium and hierarchical MoS2 nanostructures via a facile hydrothermal method. It was found that the as-synthesized Na-doped MoS2@NiO/C nanocomposites with hierarchical porosity exhibited superior electrochemical performance. Particularly, the delivered electrochemical capacitance of NiO/C yolk-shell structure was 1779.50 F g−1 in an aqueous electrolyte (2 M KOH), and a superior specific capacitance of 2540.63 F g−1 was acquired after the incorporation of sodium and 2D layered MoS2 into the nanocomposite. When a symmetrical supercapacitor was fabricated, a remarkable energy density of 36.93 Wh kg−1 was recorded in an environmental-friendly aqueous-based electrolyte. More significantly, the outstanding delivered capacitance retention and coulombic efficiency were 111.92 % and 97.6 %, respectively after 4000 continuous GCD cycles. Hence, the Na-doped MoS2@NiO/C with hierarchical porous nanostructures and extraordinary electrochemical performance was explicitly demonstrated in this study and can be utilized as electrode active materials in realizing high-performance supercapacitors.
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