Mesoporous NiCo2S4 nanoparticles as high-performance electrode materials for supercapacitors

Mesoporous NiCo2S4 nanoparticles as high-performance electrode materials for supercapacitors
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介孔NiCo2S4纳米粒子作为超级电容器的高性能电极材料

DOI:
10.1016/j.jpowsour.2014.09.144
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发表时间:
2015
影响因子:
9.2
通讯作者:
Ji Xiaobo
Ji Xiaobo
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhu Yirong;Wu Zhibin;Jing Mingjun;Yang Xuming;Song Weixin;Ji Xiaobo

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溶剂热法制备的介孔NiCo 2S 4纳米粒子是一种性能优异的超级电容器电极材料。采用XRD、FSEM、TEM、HRTEM、SAED、EDS和BET等手段对所得样品进行了表征。所制备的NiCo 2S 4纳米粒子具有大的比表面积、上级介孔结构和高的电子电导率,表现出优异的电化学性能,比电容高达100(1440 F g− 1,3 A g−1),250次循环后,优异的倍率性能(从2至50 A g-1的容量保持率为75.1%)和良好的循环稳定性(1000次循环的初始容量保持率为107.9%)。此外,进一步制造了利用介孔NiCo 2S 4纳米颗粒作为正极和活性炭作为负极的非对称超级电容器,其在245 W kg-1的功率密度下表现出28.3 Wh kg-1的显著能量密度和在5000次循环中91.7%的初始容量保持率的优异的上级循环稳定性。这些结果表明,介孔NiCo 2S 4纳米粒子在开发高性能超级电容器电极材料方面具有巨大的潜力。
Mesoporous NiCo2S4nanoparticles prepared through solvothermal route are reported as remarkable supercapacitor electrode materials. The resulting samples are characterized by means of XRD, FSEM, TEM, HRTEM, SAED, EDS and BET. With large specific surface area, superior mesopore structure and high electronic conductivity, the as-obtained NiCo2S4nanoparticles manifest excellent electrochemical performances with ultrahigh specific capacitance (1440 F g−1at 3 A g−1) after 250 cycles, exceptional rate capability (75.1% capacity retention from 2 to 50 A g−1) and good cycling stability (107.9% of initial capacity retention for 1000 cycles). Additionally, an asymmetric supercapacitor utilising the mesoporous NiCo2S4nanoparticles as a positive electrode and activated carbon as a negative electrode is further fabricated, which exhibits a prominent energy density of 28.3 Wh kg−1at a power density of 245 W kg−1and superior cycling stability of 91.7% initial capacity retention over 5000 cycles. These results above demonstrate the great potential of mesoporous NiCo2S4nanoparticles in the development of high-performance electrode materials for supercapacitors.
DOI: 10.1039/c3ee41776j
发表时间: 2013-11
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