Supercapacitors have been considered as one of the main energy storage devices. Recently, electrospun nanofibers have served as promising supercapacitor electrodes because of their high surface area, high porosity, flexibility, and resistance to aggregation. Here, we investigate the effects of electrospinning parameters and nickel precursors on the nanostructure of electrospun nickel oxide (NiO), as well as on their electrochemical performance as supercapacitor electrodes. In contrast to the case of using nickel nitrate, increasing the nickel acetate molar concentration maintains the flexible fibrous sheet morphology of the as-spun sample during the polycondensation and calcination of NiO. As a result, our flexible electrode of NiO nanofibers derived from nickel acetate (NiO-A) exhibits much better electrochemical performance values than that of nickel nitrate-derived NiO. To further improve the electrochemical storage performance, we combined NiO-A nanofibers with single-walled carbon nanotubes (CNTs) as a hybrid electrode. In both half-cell and full-cell configurations, the hybrid electrode displayed a higher and steadier areal capacitance than the NiO-A nanofibers because of the synergetic effect between the NiO-A nanofibers and CNTs. Altogether, this work demonstrates the potency of the hybrid electrodes combined with the electrospun NiO-A nanofibers and CNTs for supercapacitor applications.

中文翻译：

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前驱体和碳纳米管对电纺氧化镍纳米纤维基超级电容器电化学性能的影响

超级电容器一直被认为是主要的储能装置之一。最近，电纺纳米纤维因其高表面积、高孔隙率、柔韧性和抗聚集性而成为很有前景的超级电容器电极。在这里，我们研究了静电纺丝参数和镍前驱体对静电纺丝氧化镍 (NiO) 纳米结构的影响，以及对其作为超级电容器电极的电化学性能的影响。与使用硝酸镍的情况相反，在 NiO 的缩聚和煅烧过程中，增加醋酸镍摩尔浓度可以保持初纺样品的柔性纤维片形态。其结果，我们由醋酸镍 (NiO-A) 衍生的 NiO 纳米纤维柔性电极比硝酸镍衍生的 NiO 具有更好的电化学性能值。为了进一步提高电化学存储性能，我们将 NiO-A 纳米纤维与单壁碳纳米管 (CNT) 结合作为混合电极。在半电池和全电池配置中，由于 NiO-A 纳米纤维和 CNT 之间的协同效应，混合电极显示出比 NiO-A 纳米纤维更高和更稳定的面电容。总之，这项工作证明了混合电极与电纺 NiO-A 纳米纤维和 CNT 相结合用于超级电容器应用的效力。我们将 NiO-A 纳米纤维与单壁碳纳米管 (CNT) 结合作为混合电极。在半电池和全电池配置中，由于 NiO-A 纳米纤维和 CNT 之间的协同效应，混合电极显示出比 NiO-A 纳米纤维更高和更稳定的面电容。总之，这项工作证明了混合电极与电纺 NiO-A 纳米纤维和 CNT 相结合用于超级电容器应用的效力。我们将 NiO-A 纳米纤维与单壁碳纳米管 (CNT) 结合作为混合电极。在半电池和全电池配置中，由于 NiO-A 纳米纤维和 CNT 之间的协同效应，混合电极显示出比 NiO-A 纳米纤维更高和更稳定的面电容。总之，这项工作证明了混合电极与电纺 NiO-A 纳米纤维和 CNT 相结合用于超级电容器应用的效力。