Fabrication and electrochemical performances of hierarchical porous Ni(OH)2 nanoflakes anchored on graphene sheets
Fabrication and electrochemical performances of hierarchical porous Ni(OH)2 nanoflakes anchored on graphene sheets
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DOI：
10.1039/c2jm30221g
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发表时间：
2012-05
影响因子：
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通讯作者：
Jun Yan;Wei Sun;Tong Wei;Qiang Zhang;Zhuangjun Fan;F. Wei
中科院分区：
文献类型：
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作者：
Jun Yan;Wei Sun;Tong Wei;Qiang Zhang;Zhuangjun Fan;F. Wei
采用一种简便的化学沉淀法在石墨烯基片上制备了分级多孔Ni(OH)2纳米薄片。所制备的Ni(OH)2/石墨烯复合材料作为超级电容器的电极材料，具有超高的比容量、优异的循环性能和优异的倍率性能。在6 M KOH水溶液中，当电压为2 mV时，S−1的比电容达到最大值，为2194 F g−1。同时，该电极表现出良好的长循环寿命，经2000次循环试验后，比电容保持了95.7%。这种复合材料是一种非常有前途的电极材料，在能量转换/存储系统中有广泛的应用。
Hierarchical porous Ni(OH)2 nanoflakes anchored on graphene sheets has been fabricated by a facile chemical precipitation approach. The as-prepared Ni(OH)2/graphene composite as a electrode material for supercapacitors displays ultrahigh specific capacitance, superior cycling performance, and excellent rate capability. A maximum specific capacitance of 2194 F g−1 could be obtained at 2 mV s−1 in 6 M KOH aqueous solution. Meanwhile, the electrode exhibits excellent long cycle life along with 95.7% specific capacitance retained after 2000 cycle tests. Such composite is a highly promising candidate as electrode material for broad applications in energy conversion/storage systems.