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Binder free 2D aligned efficient MnO2 micro flowers as stable electrodes for symmetric supercapacitor applications

机译：无粘合剂的二维对齐高效MnO 2 微花作为稳定电极，用于对称超级电容器应用

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Herein, δ-MnO2 micro-flower thin films are grown directly onto a stainless steel mesh via a simple rotational chemical bath deposition technique. Moreover, the influence of the concentration of precursor ratio of MnSO4?:?KMnO4 is investigated and the obtained samples are designated as M1 (KMnO4?:?MnSO4 = 3?:?1), M2 (KMnO4?:?MnSO4 = 3?:?2) and M3 (KMnO4?:?MnSO4 = 3?:?3). The concentration of MnSO4 as a starting material has a significant influence on the reaction kinetics, which subsequently alters the morphology and also the electrochemical performance. Among these three electrodes, the M1 electrode exhibits a high specific capacitance of 376 F g?1 at a current density of 5 mA cm?2 and a high specific energy of 52 W h kg?1, which is higher than M2 (specific capacitance 312 F g?1 and specific energy 43 W h kg?1) and M3 (specific capacitance 283 F g?1 and specific energy 39 W h kg?1) electrodes. Due to the interesting performance of the M1 based electrode, the symmetric device is fabricated using two electrodes M1 (3?:?1) and represented as SSM/M1//M1/SSM. The device provides a maximum specific capacitance of 87 F g?1 and specific energy density of 32 W h kg?1 at a current density of 5 mA cm?2. In addition, the symmetric device of the M1 electrode also exhibits good cycle stability showing 138% capacitance retention up to 2500 cycles. The enhanced electrochemical performance could be attributed to the direct growth of micro-flowers of MnO2 on a stainless steel mesh, which provides more pathways for easy diffusion of electrolyte ions into the electrode. This study provides new insight and pathways for the development of low-cost and high-performance energy storage devices.
机译：本文中，通过简单的旋转化学浴沉积技术将δ-MnO 2 微花薄膜直接生长在不锈钢网上。此外，研究了MnSO 4 ？：？KMnO 4 的前驱体浓度对浓度的影响，获得的样本被指定为M1（KMnO 4 ？：？MnSO 4 = 3？：？1）， M2（KMnO 4 ？：？MnSO 4 = 3？：？2）和M3（KMnO 4 ？：？MnSO 4 = 3？：？3）。 MnSO 4 的起始浓度对反应动力学有重要影响，随后改变了形态和电化学性能。在这三个电极中，M1电极在5 mA cm ？2 <的电流密度下具有376 F g ？1 的高比电容。 / sup> 和52 W h kg ？1 的高比能，比M2高（比电容312 F g ？1 和比能量43 W h kg ？1 ）和M3（比电容283 F g ？ 1 和比能量39 W h kg ？1 ）电极。由于基于M1的电极具有令人感兴趣的性能，因此对称装置使用两个电极M1（3≤：≤1）制造，并表示为SSM / M1 // M1 / SSM。该设备的最大比电容为87 F g ？1 ，比能量密度为32 W h kg ？1 ？2 。此外，M1电极的对称器件还表现出良好的循环稳定性，在2500次循环之前显示了138％的电容保持率。电化学性能的提高归因于MnO 2 的微花在不锈钢网上的直接生长，这提供了更多的途径，使电解质离子易于扩散到不锈钢中。电极。这项研究为开发低成本和高性能储能设备提供了新的见识和途径。

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