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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Nanocrystalline LaOx/NiO composite as high performance electrodes for supercapacitors
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Nanocrystalline LaOx/NiO composite as high performance electrodes for supercapacitors

机译：纳米晶LAOX / NIO复合材料作为超级电容器的高性能电极

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摘要

Nanocrystalline LaOx/NiO composite electrodes were synthesized via two types of facile cathodic electrodeposition methods onto nickel foam followed by thermal annealing without any binders. Scanning electron microscopy and transmission electron microscopy investigation revealed that LaOx nanocrystalline particles with an average diameter of 50 nm are uniformly distributed in the NiO layer or alternately deposited with the NiO layer onto the substrate. It is speculated that LaOx particles can participate in the faradaic reaction directly and offer more redox sites. Besides this, the unique Ni/La layered structure facilitates the diffusion of ions and retards the electrode polarization, thus leading to a better rate capability and cycling stability of NiO. As a result, the obtained electrodes display very competitive electrochemical performance (a specific capacitance of 1238 F g(-1) at a current density of 0.5 A g(-1), excellent rate capability of 86% of the original capacitance at 10 A g(-1) and excellent cycling stability of 93% capacitance after 10 000 cycles). In addition, asymmetric coin devices were assembled using LaOx/NiO as the positive electrode and active carbon as the negative electrode. The assembled asymmetric devices demonstrate a high energy density of 13.12 W h kg(-1) at a power density of 90.72 W kg(-1).
机译：通过两种类型的容易的阴极电沉积方法合成纳米晶Laox / NiO复合电极，然后在镍泡沫上，然后在没有任何粘合剂的情况下进行热退火。扫描电子显微镜和透射电子显微镜研究表明，平均直径为50nm的Laox纳米晶颗粒在NiO层中均匀分布，或者将NiO层交替地沉积到基板上。推测Laox颗粒可以直接参与游览反应并提供更多的氧化还原位点。除此之外，独特的Ni / La分层结构有助于离子的扩散并延迟电极极化，从而导致NIO的更好的速率和循环稳定性。结果，所获得的电极显示出非常竞争力的电化学性能（在电流密度为0.5Ag（-1）的电流密度，10A的原始电容的优异速率能力为10 a G（-1）和10 000个循环后电容93％的优异循环稳定性）。此外，使用Laox / NiO作为正极和作为负极的活性炭组装不对称硬币装置。组装的不对称装置以90.72W kg（-1）的功率密度，表现出13.12Wh kg（-1）的高能量密度。

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