Abstract Although titanium dioxide (TiO2) has excellent potential as electrode materials in supercapacitors, the low areal specific capacitance and poor conductivity have hindered further development. Herein, we describe a simple way to deposit manganese dioxide (MnO2) by a two-step hydrothermal method to improve the electrochemical properties. The hydrothermal process produces hierarchical manganese dioxide (MnO2) nanospheres and long tapered TiO2 nanorod arrays on porous seed graphite felt (SGF). The MnO2/TiO2/SGF electrode shows a high areal capacitance of 196.25 mF cm−2 at 1 mA cm−2 and after 5000 test cycles, 94.4% of the capacitance is retained indicating excellent cycle stability and good reversibility. The areal capacitance and cycle stability of MnO2/TiO2/SGF are better than TiO2/SGF and MnO2/GF, and the hierarchical nanocomposite has good prospects in high-performance supercapacitors.

中文翻译：

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用于高性能超级电容器的柔性种子石墨毡上的分层无粘合剂 MnO2/TiO2 复合纳米结构

摘要 尽管二氧化钛（TiO2）作为超级电容器的电极材料具有优异的潜力，但其面积比电容低和导电性差阻碍了进一步的发展。在此，我们描述了一种通过两步水热法沉积二氧化锰 (MnO2) 以改善电化学性能的简单方法。水热过程在多孔种子石墨毡 (SGF) 上产生分级二氧化锰 (MnO2) 纳米球和长锥形 TiO2 纳米棒阵列。MnO2/TiO2/SGF 电极在 1 mA cm-2 下显示出 196.25 mF cm-2 的高面电容，并且在 5000 次测试循环后，94.4% 的电容被保留，表明出色的循环稳定性和良好的可逆性。MnO2/TiO2/SGF 的面积电容和循环稳定性优于 TiO2/SGF 和 MnO2/GF，