Nanoporous Ni(OH) Thin Film on 3D Ultrathin-Graphite Foam for Asymmetric Supercapacitor
Nanoporous Ni(OH) Thin Film on 3D Ultrathin-Graphite Foam for Asymmetric Supercapacitor
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DOI：
10.1021/nn4021955
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发表时间：
2013-07-01
期刊：
影响因子：
17.1
通讯作者：
Ruoff, Rodney S.
中科院分区：
文献类型：
--
作者：
Ji, Junyi;Zhang, Li Li;Ruoff, Rodney S.
通过水热反应在超薄石墨泡沫（UGF）表面生长纳米多孔氢氧化镍(Ni（OH)(2)）薄膜。所得到的独立Ni(OH)(2)/UGf复合材料用作超级电容器的电极，无需添加粘合剂或金属基集流器。高导电性的三维UGF网络有利于电子传递，多孔的Ni(OH)(2)薄膜结构缩短了离子扩散路径，有利于电解质离子的快速迁移。以Ni(OH)(2)/UGF为正极，活化微波氧化石墨（a-MEGO）为负极制备了非对称超级电容器。完全封装的非对称电池的最高功率密度（44.0 kW/kg）要高得多（高出2-27倍），而能量密度与高端商用超级电容器相当或更高。该非对称超级电容器在10000次循环后的电容保持率为63.2%。
Nanoporous nickel hydroxide (Ni(OH)(2)) thin film was grown on the surface of ultrathin-graphite foam (UGF) via a hydrothermal reaction. The resulting free-standing Ni(OH)(2)/UGf composite was used as the electrode in a supercapacitor without the need for addition of either binder or metal-based current collector. The highly conductive 3D UGF network facilitates electron transport and the porous Ni(OH)(2) thin film structure shortens ion diffusion paths and facilitates the rapid migration of electrolyte ions. An asymmetric supercapacitor was also made and studied with Ni(OH)(2)/UGF as the positive electrode and activated microwave exfoliated graphite oxide ('a-MEGO') as the negative electrode. The highest power density of the fully packaged asymmetric cell (44.0 kW/kg) was much higher (2-27 times higher), while the energy density was comparable to or higher, than high-end commercially available supercapacitors. This asymmetric supercapacitor had a capacitance retention of 63.2% after 10 000 cycles.