Co(OH)2/RGO/NiO sandwich-structured nanotube arrays with special surface and synergistic effects as high-performance positive electrodes for asymmetric supercapacitors.
Co(OH)2/RGO/NiO sandwich-structured nanotube arrays with special surface and synergistic effects as high-performance positive electrodes for asymmetric supercapacitors.
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DOI：
10.1039/c5nr04449a
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发表时间：
2015-10
期刊：
影响因子：
6.7
通讯作者：
Han Xu;Chi Zhang;Wen Zhou;Gao‐Ren Li
中科院分区：
文献类型：
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作者：
Han Xu;Chi Zhang;Wen Zhou;Gao‐Ren Li
高功率密度、高能量密度和优异的循环稳定性是高性能超级电容器（SC）的主要要求，这些超级电容器将广泛用于便携式消费电子产品和混合动力电动汽车。在这里，我们研究了新型的混合Co（OH）2/还原氧化石墨烯（RGO）/NiO纳米管阵列（SNTA）作为非对称超级电容器（ASC）的正极。所合成的Co（OH）2/RGO/NiO SNTA具有显著提高的比容量由于Co（OH）2、RGO和NiO之间的特殊协同作用，电极材料的利用率高，电活性物质的迁移速度快，扩散路径短，循环稳定性好，循环10 000次后Csp保留率达98%左右。以Co（OH）2/RGO/NiO SNTA为正极，活性炭（AC）为负极组装的高性能ASC具有高的能量密度（115 Wh kg（-1））、高的功率密度（27.5 kW kg（-1））和优异的循环稳定性（10000次循环后Csp损失小于5%）。这项研究显示了一个重要的突破，在设计和制造的多壁混合纳米管阵列作为正极的ASCs。
High power density, high energy density and excellent cycling stability are the main requirements for high-performance supercapacitors (SCs) that will be widely used for portable consumer electronics and hybrid electric vehicles. Here we investigate novel types of hybrid Co(OH)2/reduced graphene oxide (RGO)/NiO sandwich-structured nanotube arrays (SNTAs) as positive electrodes for asymmetric supercapacitors (ASCs). The synthesized Co(OH)2/RGO/NiO SNTAs exhibit a significantly improved specific capacity (∼1470 F g(-1) at 5 mV s(-1)) and excellent cycling stability with ∼98% Csp retention after 10 000 cycles because of the fast transport and short diffusion paths for electroactive species, the high utilization rate of electrode materials, and special synergistic effects among Co(OH)2, RGO, and NiO. The high-performance ASCs are assembled using Co(OH)2/RGO/NiO SNTAs as positive electrodes and active carbon (AC) as negative electrodes, and they exhibit a high energy density (115 Wh kg(-1)), a high power density (27.5 kW kg(-1)) and an excellent cycling stability (less 5% Csp loss after 10 000 cycles). This study shows an important breakthrough in the design and fabrication of multi-walled hybrid nanotube arrays as positive electrodes for ASCs.