Assembly of Ni(OH) 2 -graphene hybrids with a high electrochemical performance by a one-pot hydrothermal method
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摘要:
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 mV · s -1 的扫速下比电容为1 461 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。
Abstract: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 capability 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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Key words:
- Supercapacitor /
- Ni(OH) 2 /
- Graphene sheets /
- 3D network
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