不对称超级电容器的合理设计：一种分级核壳纳米复合阴极和生物炭阳极。
Rational design of asymmetric supercapacitors a hierarchical core-shell nanocomposite cathode and biochar anode.
作者信息
Fan Meiqing, Zeng Xu, Yang Xiaodong, Zhang Xin, Ren Bo
机构信息
Measurement Biotechnique Research Center, College of Food Engineering, Jilin Engineering Normal University Changchun 130052 P. R. China.
Institute of Biomass Functional Materials Interdisciplinary Studies, Jilin Engineering Normal University Changchun 130052 P. R. China
出版信息
RSC Adv. 2019 Dec 20;9(72):42543-42553. doi: 10.1039/c9ra09142d. eCollection 2019 Dec 18.
Hierarchical MnO nanosheets attached on hollow NiO microspheres have been designed by a facile hydrothermal process. The core-shell structure is achieved by decorating an MnO nanosheet shell on a hollow NiO sphere core. The highly hollow and porous structure exhibits a high surface area, shortened ion diffusion length, outstanding electrochemical properties (558 F g at a current density of 5 mA cm), and excellent cycling stability (83% retention after 5000 cycles). To further evaluate the NiO/MnO core-shell composite electrode for real applications, three asymmetric supercapacitors (NiO/MnO//pomelo peel (PPC), NiO/MnO//buckwheat hull (BHC), and NiO/MnO//activated carbon (AC)) are assembled. The results demonstrated that NiO/MnO//BHC delivered a substantial energy density (20.37 W h kg at a power density of 133.3 W kg) and high cycling stability (88% retention after 5000 cycles) within a broad operating potential window of 1.6 V.
通过一种简便的水热法制备了附着在中空 NiO 微球上的分级 MnO 纳米片。通过在中空 NiO 球核上修饰 MnO 纳米片壳层实现了核壳结构。这种高度中空且多孔的结构具有高表面积、缩短的离子扩散长度、出色的电化学性能（在电流密度为 5 mA cm 时为 558 F g）以及优异的循环稳定性（5000 次循环后保留率为 83%）。为了进一步评估 NiO/MnO 核壳复合电极在实际应用中的性能，组装了三个不对称超级电容器（NiO/MnO//柚子皮（PPC）、NiO/MnO//荞麦壳（BHC）和 NiO/MnO//活性炭（AC））。结果表明，NiO/MnO//BHC 在 1.6 V 的宽工作电位窗口内具有较高的能量密度（在功率密度为 133.3 W kg 时为 20.37 W h kg）和高循环稳定性（5000 次循环后保留率为 88%）。
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