This article reports that extremely thin nanobelts (thickness ~ 10 nm) exhibit pseudocapacitive (PC) charge storage in the asymmetric supercapacitor (ASC) configuration, while show battery-type charge storage in their single electrodes. Two types of nanobelts, viz. NiO–Co₃O₄ hybrid and spinal-type NiCo₂O₄, developed by electrospinning technique are used in this work. The charge storage behaviour of the nanobelts is benchmarked against their binary metal oxide nanowires, i.e., NiO and Co₃O₄, as well as a hybrid of similar chemistry, CuO–Co₃O₄. The nanobelts have thickness of ~ 10 nm and width ~ 200 nm, whereas the nanowires have diameter of ~ 100 nm. Clear differences in charge storage behaviours are observed in NiO–Co₃O₄ hybrid nanobelts based ASCs compared to those fabricated using the other materials—the former showed capacitive behaviour whereas the others revealed battery-type discharge behaviour. Origin of pseudocapacitance in nanobelts based ASCs is shown to arise from their nanobelts morphology with thickness less than typical electron diffusion lengths (~ 20 nm). Among all the five type of devices fabricated, the NiO–Co₃O₄ hybrid ASCs exhibited the highest specific energy, specific power and cycling stability.

中文翻译：

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薄纳米带中的伪电容电荷存储

本文报道，极薄的纳米带（厚度约10 nm）在非对称超级电容器（ASC）配置中表现出伪电容（PC）电荷存储，而在其单电极中显示出电池型电荷存储。两种类型的纳米带，即。通过静电纺丝技术开发的NiO–Co ₃ O ₄杂化物和脊柱型NiCo ₂ O ₄用于这项工作。纳米带的电荷存储行为以其二元金属氧化物纳米线（即NiO和Co ₃ O ₄）以及类似化学物质的混合物CuO–Co ₃ O ₄为基准。。纳米带的厚度约为10 nm，宽度约为200 nm，而纳米线的直径约为100 nm。与使用其他材料制造的ASC相比，在基于NiO–Co ₃ O ₄杂化纳米带的ASC中观察到了明显的电荷存储行为-前者表现出电容行为，而其他表现出电池类型的放电行为。基于纳米带的ASC中伪电容的起源已显示出其纳米带的形态，其厚度小于典型的电子扩散长度（约20 nm）。在所制造的五种器件中，NiO-Co ₃ O ₄混合ASC表现出最高的比能，比功率和循环稳定性。