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首页> 外文期刊>Electrochimica Acta >A self-template strategy to prepare hollow NiMoS4 nanospheres supported on Ni foam as advanced supercapacitor electrodes
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A self-template strategy to prepare hollow NiMoS4 nanospheres supported on Ni foam as advanced supercapacitor electrodes

机译：一种制备空心NiMOS4纳米球的自我模板策略，支持Ni泡沫作为先进的超级电容电极

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摘要

Pseudocapacitor has recently emerged as an important electrical energy storage technology that plays a critical role in portable electronic device, hybrid electric vehicle, backup energy system, and so on. In spite of the great advances, preparing ultra-stable pseudocapacitor with excellent electrochemical performance is still very challenging. Herein, we developed a simple but novel self-template method to synthesize hierarchical hollow NiMoS4 nanospheres with ultrathin shell thickness. During the preparation, nickel-molybdenum oxides coated SiO2 precursors were firstly synthesized. After a sulfidation process with Na2S under hydrothermal condition, the precursors were transformed into hierarchical hollow NiMoS4 nanospheres. Simultaneously, the interior SiO2 was well etched by tuning the initial Ni/S molar ratio. In addition, hollow NiMoS4 nanospheres with different shell thickness were also prepared. Remarkably, the obtained NiMoS4 nanospheres show a very high electrochemical activity due to their fascinating structural and compositional features. The electrode prepared from the NiMoS4 nanospheres delivers a high specific capacity of 1094 C g(-1) current density of 1 A g(-1) with enhanced cycling stability of 97.95% capacitance retention after 10,000 cycles, making them to be potential electrode materials for SCs and other related energy storage devices. (C) 2020 Elsevier Ltd. All rights reserved.
机译：伪电容器最近被出现为一个重要的电能存储技术，可在便携式电子设备，混合动力电动汽车，备用能量系统等中发挥着关键作用。尽管有很大的进步，但为具有优异电化学性能的超稳定的假偶联机制备了超稳定的假偶，仍然非常具有挑战性。在此，我们开发了一种简单但新的自我模板方法，以合成具有超薄壳厚度的分层中空NiMOS4纳米球。在制备过程中，首先合成镍 - 氧化镍涂覆的SiO 2前体。在水热条件下具有Na2s的硫化过程之后，将前体转化成分级空心龙枕体4纳米球。同时，通过调节初始Ni / S摩尔比来良好地蚀刻内部SiO 2。此外，还制备了具有不同壳厚度的空心尼莫斯4纳米球。值得注意的是，由于其迷人的结构和组成特征，所获得的NiMOS4纳米球显示出非常高的电化学活性。由NiMOS4纳米球制备的电极可提供1094℃（-1）电流密度的高比容量为1Ag（-1），增强循环稳定性为10,000个循环后的电容保留97.95％，使其成为潜在的电极材料对于SCS和其他相关的能量存储设备。 （c）2020 elestvier有限公司保留所有权利。

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