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首页> 外文期刊>Energy Conversion & Management >Comparison of nano-MnO_2 derived from different manganese sources and influence of active material weight ratio on performance of nano-MnO_2/activated carbon supercapacitor
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Comparison of nano-MnO_2 derived from different manganese sources and influence of active material weight ratio on performance of nano-MnO_2/activated carbon supercapacitor

机译:不同锰源的纳米MnO_2的比较及活性物质重量比对纳米MnO_2 /活性炭超级电容器性能的影响

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摘要

Two nanostructured γ-MnO_2 materials were prepared via a solid-state reaction route starting with a room-temperature solid-state grinding reaction between hydrated (NH_4)_2C_2O_4H_2O and MnSO_4·H_2O or MnCl_2·4H_2O manganese source to obtain the manganese oxalate (MnC_2O_4) precursors, followed by calcination of the precursors at 400 ℃, and successive acid-treatment process. Their structural and pseudoc-apacitive properties were characterized by X-ray diffraction, infrared spectroscopy, transmission electron microscopy and electrochemical methods. The crystallinity of the nano-MnO_2 derived from MnCl_2-4H_2O source is lower than that derived from MnSO_4·H_2O source. The former MnO_2 showed a lower specific capacitance, but a better charge/discharge cycle stability compared to the later. In addition, four nano-MnO_2/activated carbon hybrid supercapacitors with different active material weight ratios (positive to negative) were constructed and examined in terms of electrochemical performance. Experimental results suggested that the most appropriate active material weight ratio should be 1:1, then the best overall electrochemical performance would be achieved.
机译:从水合(NH_4)_2C_2O_4H_2O和MnSO_4·H_2O或MnCl_2·4H_2O锰源之间的室温固态研磨反应开始,通过固态反应路线制备两种纳米结构的γ-MnO_2材料,以获得草酸锰(MnC_2O_4)前驱体,然后在400℃下煅烧前驱体,并进行连续的酸处理过程。通过X射线衍射,红外光谱,透射电子显微镜和电化学方法表征了它们的结构和假电容性。来自MnCl_2-4H_2O源的纳米MnO_2的结晶度低于来自MnSO_4·H_2O源的纳米MnO_2的结晶度。前者的MnO_2的比电容较低,但与后者相比,充放电循环的稳定性更好。另外,构建了四种具有不同活性物质重量比(正负)的纳米MnO_2 /活性炭杂化超级电容器,并对其电化学性能进行了研究。实验结果表明,最合适的活性物质重量比应为1:1,这样才能获得最佳的整体电化学性能。

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