Nanowires self-assemble into β-MnO2 nanospheres to form crosslinking 3D hierarchical porous networks: with template-free fabrication and good supercapacitive performance over a broad temperature range,Sustainable Energy & Fuels

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Nanowires self-assemble into β-MnO2 nanospheres to form crosslinking 3D hierarchical porous networks: with template-free fabrication and good supercapacitive performance over a broad temperature range
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-08-20 , DOI: 10.1039/d1se00995h
Li-Li Yu ₁ , Wei-Ling Xu ₁ , Jian-Guo Zhang ₁ , Shuang Li ₁ , Rong-Bing Li ₁ , Jing-Tai Zhao ₂

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Porous nanospheres self-assembled from nanowires interconnecting with each other to form 3D hierarchical mesoporous networks of beta-MnO₂ (β-MnO₂) are successfully prepared, with a high yield, at room temperature with a template-free approach. Due to its high specific surface area, abundant pores, interconnected structure, as well as a great length/diameter ratio, the as-prepared β-MnO₂, in 0.5 M Na₂SO₄, exhibits a good electrochemical performance at a wide temperature range of 5–80 °C. The ion conductivity of the electrolytes proved to be the main factor for the enhancement of the surface controlled capacitance of β-MnO₂ as the temperature increased. Therefore, when assembled with an AC to form an asymmetrical supercapacitor, β-MnO₂//AC can derive 12.9 W h kg⁻¹ at 9.5 kW kg⁻¹ with a superior cycling stability (91.8%, after 5000 cycles at 5 A g⁻¹) at 5–50 °C, even after suffering from a sudden temperature change. This proves that the as-formed MnO₂ is a promising electrode material for supercapacitor applications requiring a high-performance over a broad temperature range.

中文翻译：

纳米线自组装成 β-MnO2 纳米球以形成交联的 3D 分层多孔网络：在宽温度范围内具有无模板制造和良好的超级电容性能

多孔纳米球由相互连接的纳米线自组装形成 3D 分层介孔网络 β-MnO ₂ (β-MnO ₂ )，在室温下以无模板方法成功制备，产量高。由于其高比表面积、丰富的孔隙、相互连接的结构以及大的长径比，所制备的 β-MnO ₂，在 0.5 M Na ₂ SO _{4 中}，在较宽的温度下表现出良好的电化学性能5–80 °C 的范围。电解质的离子电导率被证明是提高β-MnO ₂表面控制电容的主要因素随着温度的升高。因此，当与AC组装以形成一个非对称超电容器，β-MnO的₂ // AC可以推导12.9 W时千克^-1在9.5千瓦千克^-1具有优异的循环稳定性（91.8％，在5 A G 5000次循环后^-1 ) 在 5–50 °C，即使在遭受突然的温度变化之后。这证明所形成的 MnO ₂是一种用于需要在宽温度范围内具有高性能的超级电容器应用的有前途的电极材料。

更新日期：2021-09-01

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