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Preparation of nanoporous nickel-copper sulfide on carbon cloth for high-performance hybrid supercapacitors
Electrochimica Acta ( IF 6.6 ) Pub Date : 2018-04-07
Dongwei Du, Rong Lan, John Humphreys, Houari Amari, Shanwen Tao

In this work, nanoporous nickel-copper sulfide on carbon cloth was successfully prepared via sulfurizing the nickel-copper carbonate hydroxide precursor through an anion exchange reaction. The as-fabricated electrode exhibits a high specific capacitance of 938.6 F g−1 at a current density of 1 A g−1 and good rate capability of 76% at 10 A g−1, as well as excellent flexibility. Charge storage analysis demonstrates that the combination of surface-controlled capacitive process and diffusion-controlled Faradaic process, both contribute to the total capacitance. In addition, the good performance of the nanoporous nickel-copper sulfide can be attributed to the possible higher conductivity and porous nanostructures which offers more active sites to yield extrinsic pseudocapacitance. A hybrid supercapacitor was assembled with nickel-copper sulfide as the positive electrode and nitrogen-doped graphene as the negative electrode, delivering a high cell voltage up to 1.7 V with a maximum energy density of 35.3 Wh kg−1 and a maximum power density of 12700 W kg−1. The high performance we achieved suggests that the nanoporous nickel-copper sulfide has deep potential for high-performance supercapacitor applications.



中文翻译:

高性能混合超级电容器用碳布上纳米多孔镍-铜硫化物的制备

在这项工作中,通过阴离子交换反应将镍-铜碳酸盐氢氧化物前体硫化,成功地在碳布上制备了纳米多孔的镍-铜铜硫化物。制成的电极在1 A g -1的电流密度下表现出938.6 F g -1的高比电容,在10 A g -1时具有76%的良好倍率能力,以及出色的灵活性。电荷存储分析表明,表面控制电容过程和扩散控制法拉第过程的组合均对总电容有所贡献。另外,纳米多孔镍-铜硫化物的良好性能可以归因于可能更高的电导率和多孔纳米结构,其提供了更多的活性位点以产生非本征的假电容。混合超级电容器以硫化镍铜为正极,掺氮石墨烯为负极,可提供高达1.7V的高电池电压,最大能量密度为35.3 Wh kg -1和最大功率密度为。 12700公斤kg -1。我们获得的高性能表明,纳米多孔镍-铜硫化物对于高性能超级电容器应用具有深远的潜力。

更新日期:2018-04-08
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