一步水热法制备氢氧化镍-石墨烯复合材料及其电化学性能(英文)

Assembly of Ni(OH)_2-graphene hybrids with a high electrochemical performance by a one-pot hydrothermal method

通过一步水热法制备出具有三维网络结构的氢氧化镍-石墨烯复合材料(Ni(OH)2-GS)。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 m V·s-1的扫速下比电容为1 461 F·g-1,在100 m V·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）2-graphenehybrid with a three dimensional （3D） interconnected graphene network was prepared by a simple one-pot 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 capabili- 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%.