Ultrathin and Lightweight 3D Free-Standing Ni@NiO Nanowire Membrane Electrode for a Supercapacitor with Excellent Capacitance Retention at High Rates
Ultrathin and Lightweight 3D Free-Standing Ni@NiO Nanowire Membrane Electrode for a Supercapacitor with Excellent Capacitance Retention at High Rates
复制标题
用于超级电容器的超薄轻质 3D 自立式 Ni@NiO 纳米线膜电极，在高倍率下具有出色的电容保持能力
DOI：
10.1021/am503108x
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发表时间：
2014-08-27
影响因子：
9.5
通讯作者：
Gao, Yihua
中科院分区：
文献类型：
--
作者：
Liu, Nishuang;Li, Jian;Gao, Yihua
通过简单的过滤方法和随后的热退火制备了无粘结剂的独立式3D Ni@NiO纳米线膜。通过适当的退火温度，功能纳米线可以保持其粗糙和刺状的表面，并且由焊接的镍纳米线核心组成的导电网络可以完好地保存而不隔离（0.53 Omega/sq）。独特的三维多级介孔结构不仅加快了电解质离子的嵌入和脱出速度，而且为法拉第反应提供了大量的电活性位点。结果，超级电容器电极可以在高放电电流密度下保持96.1%（36.9 F/cm（3））的电容保持率，表明其优异的倍率性能。所制备的膜电极具有高的体积电容，稳定的循环寿命，以及在高速率、能量和功率密度下的电容的显著保持，使其成为应用于便携式电子产品的有希望的候选者。
A free-standing binder-free 3D Ni@NiO nanowire membrane is fabricated by a simple filtration method followed by thermal annealing. With an appropriate annealing temperature, the functional nanowires can keep their rough and echinate surface, and the conductive network composed of welded nickel nanowire cores is well-preserved without isolation (0.53 Omega/sq). The unique 3D multigrade mesporous structure not only accelerates the intercalation and deintercalation velocity of electrolyte ions but also provides numerous electroactive sites for the Faraday reaction. As a result, the supercapacitor electrode can preserve a capacitance retention of 96.1% (36.9 F/cm(3)) with a high discharge current density, indicating its wonderful rate capability. The fabricated membrane electrode exhibits high volumetric capacitance, stable cycling life, and remarkable retention of the capacitance at high rate, energy, and power density, making it a promising candidate for application in portable electronic products.