Department of Polymer Engineering, College of Polymer Science and Polymer Engineering, The University of Akron , Akron, Ohio 44325, United States.
Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University , Lanzhou 730070, P. R. China.
ACS Appl Mater Interfaces. 2017 May 24;9(20):17067-17075. doi: 10.1021/acsami.7b02776. Epub 2017 May 12.
In this study, we report novel NiSe@MoSe nanosheet arrays prepared by a facile one-step hydrothermal method through nickel (Ni) foam as Ni precursor and the framework of MoSe. Owing to the unique interconnection and hierarchical porous nanosheet array architecture, the NiSe@MoSe nanosheet arrays exhibit a high specific capacitance of 774 F g at the current density of 1 A g, which is almost 2 times higher than that (401 F g) of the NiSe matrix and about 7 times greater than that (113 F g) of the MoSe nanoparticles. Moreover, we report an asymmetric supercapacitor (ASC), which is fabricated by using the NiSe@MoSe nanosheet arrays as the positive electrode and the graphene nanosheets (GNS) as the negative electrode, with aqueous KOH as the electrolyte. The NiSe@MoSe//GNS ASC possesses an output voltage of 1.6 V, an energy density of 25.5 Wh kg at a power density of 420 W kg, and a cycling stability of 88% capacitance retention after 5000 cycles. These results indicate that the NiSe@MoSe nanosheet arrays are a good electrode for supercapacitors.
在这项研究中，我们通过镍（Ni）泡沫作为 Ni 前体和 MoSe 的框架，报告了一种通过简便的一步水热法制备的新型 NiSe@MoSe 纳米片阵列。由于独特的互联和分层多孔纳米片阵列结构，NiSe@MoSe 纳米片阵列在 1 A g 的电流密度下表现出 774 F g 的高比电容，几乎是 NiSe 基体（401 F g）的 2 倍，是 MoSe 纳米颗粒（113 F g）的 7 倍。此外，我们报告了一种不对称超级电容器（ASC），它由 NiSe@MoSe 纳米片阵列作为正极，石墨烯纳米片（GNS）作为负极，以水性 KOH 作为电解质制成。NiSe@MoSe//GNS ASC 的输出电压为 1.6 V，在 420 W kg 的功率密度下的能量密度为 25.5 Wh kg，在 5000 次循环后具有 88%的电容保持率的循环稳定性。这些结果表明，NiSe@MoSe 纳米片阵列是超级电容器的一种良好电极材料。
