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Mixed Cu2Se Hexagonal Nanosheets@Co3Se4 Nanospheres for High-Performance Asymmetric Supercapacitors
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2021-04-26 , DOI: 10.1002/chem.202100857
Ang Li 1 , Miaomiao Zhai 1 , Mingxing Luan 1 , Jingbo Hu 1, 2
Affiliation  

Rational designing and constructing multiphase hybrid electrode materials is an effective method to compensate for the performance defects of the single component. Based on this strategy, Cu2Se hexagonal nanosheets@Co3Se4 nanospheres mixed structures have been fabricated by a facile two-step hydrothermal method. Under the synergistic effect of the high ionic conductivity of Cu2Se and the remarkable cycling stability of Co3Se4, Cu2Se@Co3Se4 can exhibit outstanding electrochemical performance as a novel electrode material. The as-prepared Cu2Se@Co3Se4 electrode displays high specific capacitance of 1005 F g−1 at 1 A g−1 with enhanced rate capability (56 % capacitance retention at 10 A g−1), and ultralong lifespan (94.2 % after 10 000 cycles at 20 A g−1). An asymmetric supercapacitor is assembled applying the Cu2Se@Co3Se4 as anode and graphene as cathode, which delivers a wide work potential window of 1.6 V, high energy density (30.9 Wh kg−1 at 0.74 kW kg−1), high power density (21.0 Wh kg−1 at 7.50 kW kg−1), and excellent cycling stability (85.8 % after 10 000 cycles at 10 A g−1).

中文翻译:

用于高性能非对称超级电容器的混合 Cu2Se 六边形纳米片@Co3Se4 纳米球

合理设计和构建多相混合电极材料是弥补单组分性能缺陷的有效方法。基于该策略,通过简便的两步水热法制备了Cu 2 Se六方纳米片@Co 3 Se 4纳米球混合结构。在Cu 2 Se的高离子电导率和Co 3 Se 4显着的循环稳定性的协同作用下,Cu 2 Se@Co 3 Se 4作为一种新型电极材料可以表现出优异的电化学性能。制备的 Cu 2 Se@Co 3 Se4电极在 1 A g -1 下显示出 1005 F g -1 的高比电容,具有增强的倍率性能(在 10 A g -1 时保持 56 % 的电容保持率)和超长寿命(在 20 A g - 10 000 次循环后为 94.2 % 1)。使用Cu 2 Se@Co 3 Se 4作为阳极和石墨烯作为阴极组装不对称超级电容器,其提供1.6 V的宽工作电位窗口,高能量密度(30.9 Wh kg -1在0.74 kW kg -1),高功率密度(21.0瓦千克-1在7.50千瓦千克-1),以及优异的循环稳定性(85.8%在10 A G 10 000次循环后-1 )。
更新日期:2021-04-26
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