Cu2O templating strategy for the synthesis of octahedral Cu2O@Mn(OH)2 core–shell hierarchical structures with a superior performance supercapacitor†,Journal of Materials Chemistry A

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Cu2O templating strategy for the synthesis of octahedral Cu2O@Mn(OH)2 core–shell hierarchical structures with a superior performance supercapacitor†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-06-16 00:00:00 , DOI: 10.1039/c8ta01828f
Hongtao Guan _{1,

2,

3,

4} , Pan Cai _{1,

2,

3,

4} , Xiaomeng Zhang _{1,

2,

3,

4} , Yanlin Zhang _{1,

2,

3,

4} , Gang Chen _{1,

2,

3,

4} , Chengjun Dong _{1,

2,

3,

4}

Affiliation

We demonstrate the design and fabrication of novel Cu₂O@Mn(OH)₂ core–shell hierarchical structures using octahedral Cu₂O as a template. The Cu₂O backbone supports the growth of an ultrathin Mn(OH)₂ nanoflake shell, leading to a relatively large surface area (65.8 m² g⁻¹) for sufficient utilization of active materials. Cyclic voltammetry (CV) and galvanostatic charge–discharge measurements (GCD), as well as cycling stability and electrochemical impedance spectroscopy (EIS) were performed to examine the electrochemical performances of the Cu₂O@Mn(OH)₂ core–shell structure. Applied as a supercapacitor electrode, the Cu₂O@Mn(OH)₂ composite delivers a high specific capacitance of 540.9 F g⁻¹ at 1 A g⁻¹ and an energy density of 6.4–18.2 Wh kg⁻¹. After conducting 3000 cycles at 5.0 A g⁻¹, the capacitance retention of 71.5% was achieved. The unique core–shell structure of the Cu₂O@Mn(OH)₂ composite favours the effective transport of electrolytes and shortens the ion diffusion path. In addition, the synergetic effects from both Cu₂O and Mn(OH)₂ significantly enhance the electrochemical performances. Our findings suggest that this Cu₂O@Mn(OH)₂ core–shell is very promising for next generation high-performance supercapacitors.

中文翻译：

具有卓越性能的超级电容器的八面体Cu ₂ O @ Mn（OH）₂核-壳层级结构的 Cu ₂ O模板化策略†

我们演示了使用八面体Cu ₂ O作为模板的新型Cu ₂ O @ Mn（OH）₂核-壳层级结构的设计和制造。Cu ₂ O主链支持超薄Mn（OH）₂纳米薄片壳的生长，导致足够大的表面积（65.8 m ² g ^-1）用于充分利用活性材料。进行了循环伏安法（CV）和恒电流充放电测量（GCD）以及循环稳定性和电化学阻抗谱（EIS）来检查Cu ₂ O @ Mn（OH）₂的电化学性能核壳结构。用作超级电容器电极，Cu ₂ O @ Mn（OH）₂复合材料在1 A g ^-1下提供540.9 F g ^-1的高比电容，并且能量密度为6.4-18.2 Wh kg ^-1。在5.0 A g ^-1下进行3000次循环后，电容保持率为71.5％。Cu ₂ O @ Mn（OH）₂复合材料独特的核-壳结构有利于电解质的有效传输，并缩短了离子扩散路径。另外，来自Cu ₂ O和Mn（OH）₂的协同作用显着增强了电化学性能。我们的发现表明，这种铜₂ O @ Mn（OH）₂核壳对于下一代高性能超级电容器非常有前途。

更新日期：2018-06-16

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