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High-Performance Asymmetric Supercapacitor Based on Hierarchical NiMn2O4@CoS Core–Shell Microspheres and Stereotaxically Constricted Graphene
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-10-19 00:00:00 , DOI: 10.1021/acssuschemeng.8b04265
Ning Hu 1 , Lei Huang 1 , Wenhao Gong 1 , Pei Kang Shen 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-10-19 00:00:00 , DOI: 10.1021/acssuschemeng.8b04265
Ning Hu 1 , Lei Huang 1 , Wenhao Gong 1 , Pei Kang Shen 1
Affiliation
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Three-dimensional self-assembled hierarchical NiMn2O4@CoS core–shell microspheres were synthesized via facile hydrothermal and post-electrodeposition methods on a Ni substrate. The microspheres were irregularly composed of many nanoflakes, whose diameter was approximately 1.8 μm. The NiMn2O4@CoS composites were used as electrode materials exhibiting a ultrahigh specific capacitance and excellent cycle performance for pseudocapacitors. The specific capacitance of the composite electrode reached 1751 F/g at a current density of 1 A/g and 1270 F/g at a higher current density of 30 A/g. Most importantly, the specific capacitance still maintained 95% of the original value after 5000 cycles at 10 A/g. A NiMn2O4@CoS//stereotaxically constricted graphene (SCG) asymmetric supercapacitor device also showed a high energy density of 44.56 W h kg–1 at a power density of 700.51 W/kg and an enormous power density of 20.99 kW/kg at 29.1 W h kg–1. Moreover, the capacitance still maintained 94% of the original value even after 5000 cycles at 10 A/g. This outstanding electrochemical performance possibly makes NiMn2O4@CoS the next candidate electrode material for supercapacitor applications.
中文翻译：
基于分层NiMn 2 O 4 @CoS核壳微球和立体定向收缩石墨烯的高性能不对称超级电容器
通过简便的水热和后电沉积方法在Ni基片上合成了三维自组装的分级NiMn 2 O 4 @CoS核-壳微球。微球不规则地由许多纳米薄片组成，其直径约为1.8μm。NiMn 2 O 4 @CoS复合材料被用作电极材料，该电极材料具有超高的比电容和出色的伪电容器循环性能。复合电极的比电容在1 A / g的电流密度下达到1751 F / g，在30 A / g的更高电流密度下达到1270 F / g。最重要的是，在10 A / g的5000次循环后，比电容仍保持原始值的95％。镍锰2 O4 @ CoS //立体定向收缩的石墨烯（SCG）不对称超级电容器器件在700.51 W / kg的功率密度下还显示出44.56 W h kg –1的高能量密度，在29.1 W h的功率密度为20.99 kW / kg的巨大功率密度千克–1。此外，即使在10 A / g的电流下经过5000次循环后，电容仍保持原始值的94％。这种出色的电化学性能可能使NiMn 2 O 4 @CoS成为超级电容器应用中的下一个候选电极材料。
更新日期：2018-10-19
中文翻译：
基于分层NiMn 2 O 4 @CoS核壳微球和立体定向收缩石墨烯的高性能不对称超级电容器
通过简便的水热和后电沉积方法在Ni基片上合成了三维自组装的分级NiMn 2 O 4 @CoS核-壳微球。微球不规则地由许多纳米薄片组成，其直径约为1.8μm。NiMn 2 O 4 @CoS复合材料被用作电极材料，该电极材料具有超高的比电容和出色的伪电容器循环性能。复合电极的比电容在1 A / g的电流密度下达到1751 F / g，在30 A / g的更高电流密度下达到1270 F / g。最重要的是，在10 A / g的5000次循环后，比电容仍保持原始值的95％。镍锰2 O4 @ CoS //立体定向收缩的石墨烯（SCG）不对称超级电容器器件在700.51 W / kg的功率密度下还显示出44.56 W h kg –1的高能量密度，在29.1 W h的功率密度为20.99 kW / kg的巨大功率密度千克–1。此外，即使在10 A / g的电流下经过5000次循环后，电容仍保持原始值的94％。这种出色的电化学性能可能使NiMn 2 O 4 @CoS成为超级电容器应用中的下一个候选电极材料。
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