Hierarchical NiSe2 spheres composed of tiny nanoparticles for high performance asymmetric supercapacitors†,CrystEngComm

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Hierarchical NiSe2 spheres composed of tiny nanoparticles for high performance asymmetric supercapacitors†
CrystEngComm ( IF 2.6 ) Pub Date : 2018-12-21 00:00:00 , DOI: 10.1039/c8ce01805g
Jiaqin Yang _{1,

2,

3,

4,

5} , Zhiying Sun _{1,

2,

3,

4} , Jiahui Wang _{1,

2,

3,

4} , Jing Zhang _{1,

2,

3,

4} , Yujiao Qin _{1,

2,

3,

4} , Jinmao You _{1,

2,

3,

4} , Lirong Xu _{1,

2,

3,

4}

Affiliation

To achieve superior performance of electrode materials, the design of rational and advantageous hierarchical structures has been confirmed as an effective and feasible approach. Herein, we report an effective strategy for the synthesis of hierarchical NiSe₂ spheres composed of nanoparticles: Ni(OH)₂ flowers were firstly prepared as the precursor via a solvothermal method followed by a solvothermal selenylation reaction to prepare hierarchical NiSe₂ spheres. Investigated as electrode materials for asymmetric supercapacitors, the NiSe₂ spheres//AC device exhibits enhanced electrochemical performance with a high specific capacitance of 99.7 F g⁻¹ at a current density of 2 A g⁻¹. In addition, high energy/power density and long-term cycling stability over 10 000 cycles have been shown, which derive from the nanosized building-blocks and secondary micro-architecture.

中文翻译：

由微小纳米颗粒组成的分层NiSe ₂球体，用于高性能不对称超级电容器†

为了获得优异的电极材料性能，合理且有利的分层结构设计已被确认为一种有效且可行的方法。在这里，我们报告了一种合成由纳米颗粒组成的分层NiSe ₂球的有效策略：首先通过溶剂热方法制备Ni（OH）₂花作为前体，然后进行溶剂热硒化反应以制备分层NiSe ₂球。作为非对称超级电容器的电极材料，NiSe ₂球// AC器件表现出增强的电化学性能，在2 A g的电流密度下具有99.7 F g ^-1的高比电容^-1。此外，已显示出高能量/功率密度和超过10 000次循环的长期循环稳定性，这是由纳米级构造块和次级微体系结构产生的。

更新日期：2018-12-21

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