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A one-step practical strategy to enhance overall supercapacitor performance

机译：一步一步的实践策略，以提高整体超级电容器性能

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摘要

We introduce a straightforward strategy to simultaneously improve the capacitance, rate capability, and cycle life of a supercapacitor by simply electrodepositing Ni-nanoparticles (Ni-NPs) on an as-prepared electrode. 3D-structured current collectors such as metal foams, metal meshes, and carbon meshes have been widely used in supercapacitors, secondary batteries, glucose sensors, etc. In particular, the 3D-metal foam readily improves device properties due to its unique 3D-nature and high surface area. However, there are practical constraints when applying 3D-current collectors to the industrial world, including high cost. Here, by simply electrodepositing Ni-NPs in a cost-efficient manner, a similar effect to that derived with the use of 3D-metal foam was realized. After deposition, Ni-NPs are preferentially located near the contact area between the active materials and a plate-type current collector, which allows for tight binding between the active materials and the current collector as well as facile charge transfer and high capacitance. The Ni-deposited Ni(OH)(2) electrode pasted on a plate metal substrate showed 350% increased capacitance (1264 F g(-1)) and stability of 75% and 72% after 10 000 cycles and at a high current density of 20 A g(-1), respectively. Given the simplicity and cost-efficiency of this method, it can be readily applied to other energy storage devices with practical applications in the industrial world.
机译：我们介绍了一种简单的策略，可以通过在准备好的电极上简单地电沉积镍纳米粒子（Ni-NPs）来同时提高超级电容器的电容，速率能力和循环寿命。 3D结构的集电器（例如金属泡沫，金属网和碳网）已广泛用于超级电容器，二次电池，葡萄糖传感器等中。尤其是，3D金属泡沫由于其独特的3D性质而易于改善设备性能。和高表面积。但是，将3D集流器应用于工业领域时存在一些实际限制，包括高成本。在此，通过以具有成本效益的方式简单地电沉积Ni-NP，可以实现与使用3D金属泡沫获得的相似效果。沉积后，Ni-NPs优先位于活性材料和板状集电器之间的接触区域附近，这允许活性材料和集电器之间紧密结合，并易于电荷转移和高电容。粘贴在板状金属基板上的Ni沉积Ni（OH）（2）电极在1万次循环和高电流密度下显示出350％的电容增加（1264 F g（-1））和75％和72％的稳定性分别为20 A g（-1）。鉴于此方法的简单性和成本效益，它可以很容易地应用于工业领域中具有实际应用的其他储能设备。

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