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Nickel oxide nanopetal-decorated 3D nickel network with enhanced pseudocapacitive properties

机译:具有增强的伪电容特性的氧化镍纳米花瓣装饰的3D镍网络

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摘要

Metal oxides possess high theoretical specific capacitance, but their pseudocapacitive properties are restricted by the poor electronic conductivity. Here we present a strategy to synthesize a three-dimensional binder/conducting agent-free nickel oxide (NiO) electrode through the combination of anodization with calcination. The NiO electrode is composed of a 3D conductive nickel network decorated with nanopetal-like NiO arrays. The influence of calcination temperature has been investigated, with respect to the microstructure and pseudocapacitive properties of the NiO electrodes. The NiO electrode demonstrates great electrochemical properties, especially remarkable rate capability (82% retention of the highest value for the 25-fold enhanced current density) and cycling stability (good capacitance retention after 30 000 cycles). Moreover, an asymmetric supercapacitor has been assembled using NiO as the positive electrode and activated carbon (AC) as the negative electrode. The NiO//AC supercapacitor presents excellent cycling stability (91.3% retention after 10 000 cycles), and could power a mini fan as well as a commercial red LED for more than 270 min.
机译:金属氧化物具有较高的理论比电容,但其伪电容特性受到不良的电子电导率的限制。在这里,我们提出一种通过阳极氧化与煅烧相结合来合成三维无粘合剂/导电剂的氧化镍(NiO)电极的策略。 NiO电极由3D导电镍网络组成,该网络装饰有类似纳米花瓣的NiO阵列。就NiO电极的微观结构和拟电容特性,研究了煅烧温度的影响。 NiO电极具有出色的电化学性能,特别是出色的倍率能力(电流密度提高25倍时,最大值保持82%)和循环稳定性(3万次循环后良好的电容保持率)。而且,已经使用NiO作为正极并且使用活性炭(AC)作为负极来组装不对称超级电容器。 NiO // AC超级电容器具有出色的循环稳定性(10000次循环后保持91.3%的保持力),并且可以为微型风扇和商用红色LED供电270分钟以上。

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