In this paper, highly mesoporous hierarchical mono- and bi- Ni and/or Mn based hydroxide and/or carbonate nanohybrids were synthesized using a facile free template hydrothermal method and investigated as high-performance electroactive nanomaterials for ulterior new generation of supercapacitors. Controlling the Ni/Mn precursors molar ratio and the growth conditions can offer preponderances for performances enhancing via a comparative products physic-chemical properties which were carried out using different techniques like: XRD, FTIR, Raman, XPS, HRTEM/FESEM, EDS, UV–visible and BET. The structural results confirmed the formation of MnCO, α-3Ni(OH)·2HO and Ni(HCO) phases in the synthesized nanomaterials, with different morphologies (nanofibers, nanocubes, porous micro/nanoflowers) depending on the hydrothermal synthesis conditions. Meanwhile, the influence of Ni and Mn transition metal species co-existence on the resulting composition and their optical properties were also discussed. Moreover, their electrochemical measurements were also performed in a 6 M KOH aqueous electrolyte using three electrode system. The results show that 2Ni(HCO)/MnCO nanohybrid exhibited the highest specific capacitance (capacity) of 2777 F g at 5 mV s (320 mAh.g at 1 A g) with high rate capability. This excellent electrochemical kinetics performance is ascribed to the optimized composition of Ni/Mn and its unique nanostructured configuration with intercalated ions, indicating a great potential of this new kind of nanohybrids to deliver both high energy density and high power density in future energy storage devices.

中文翻译：

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镍/锰电活性纳米杂化材料的物理化学性质，用于新一代超级电容器

在本文中，使用简便的无模板水热法合成了高度介孔分级单镍和双镍和/或锰基氢氧化物和/或碳酸盐纳米杂化物，并研究了其作为用于新一代超级电容器的高性能电活性纳米材料。控制 Ni/Mn 前体摩尔比和生长条件可以通过比较产品的物理化学性质来增强性能，这些物理化学性质是使用不同的技术进行的，如 XRD、FTIR、拉曼、XPS、HRTEM/FESEM、EDS、UV –可见并下注。结构结果证实了合成的纳米材料中形成了MnCO、α-3Ni(OH)·2HO和Ni(HCO)相，并根据水热合成条件具有不同的形貌（纳米纤维、纳米立方体、多孔微/纳米花）。同时，还讨论了Ni和Mn过渡金属共存对所得组合物及其光学性能的影响。此外，他们的电化学测量也是在 6 M KOH 水性电解质中使用三电极系统进行的。结果表明，2Ni(HCO)/MnCO纳米杂化物在5 mV s下表现出最高的比电容（容量）为2777 F g（1 A g下为320 mAh.g），具有高倍率性能。这种优异的电化学动力学性能归因于Ni/Mn的优化组成及其独特的插层离子纳米结构配置，表明这种新型纳米杂化物在未来储能装置中提供高能量密度和高功率密度的巨大潜力。