通过一步水热法制备出具有三维网络结构的氢氧化镍ˉ石墨烯复合材料(Ni(OH)2ˉGS)。这一独特的结构可以提供良好的离子传输通道,同时可以有效地提高氢氧化镍与电解液的接触面积和材料的导电性。结果表明,Ni(OH)2的质量分数为84%时,复合材料具有最佳的电化学性能,在5 mV·s-1的扫速下比电容为1461 F·g-1,在100 mV·s-1的扫速下比电容为682 F·g-1(容量保持率为47%),并且具有良好的循环稳定性。
A Ni(OH)2ˉgraphenehybrid with a three dimensional (3D) interconnected graphene network was prepared by a simple oneˉpot hydrothermal method. The 3D structure constructed of flexible and planar graphene sheets (GS) forms an effective electron transfer network and provides a continuous pore structure for ion transport. Moreover, this structure avoids the aggregation of GS and Ni( OH) 2 , resulting in a high utilization rate of Ni( OH) 2 at high contents. This study shows the hybrid has a high rate capabiliˉ ty and cyclic stability and exhibits a high specific capacitance of ~1 461 F·g-1 at a scan rate of 5 mV·s-1 with a Ni(OH)2 mass loading of ~84 mass%.
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