Abstract
A hierarchical structure of TiO2 nanorod/MnO2 ultrathin nanosheet core/shell nanocomposite arrays on a conductive substrate has been prepared by two facile steps of hydrothermal reaction and annealing progress, which serving as electrodes present great potential application for high-performance supercapacitors. By adjusting the concentration of precursor aqueous solution, it can be found that the thickness of the MnO2 shell in the as-designed hierarchical electrode material can be facilely controlled. By comparison, the obtained TiO2 nanorod/MnO2 ultrathin nanosheet as an electrode material can achieve the best electrochemical performance in terms of the area-specific capacitance up to 34.79 mF/cm2 from the cyclic voltammetry (CV) test at the scan rate of 5 mV/s. Furthermore, the composited electrode has also demonstrated good stability, with the capacitance retention rate of about 91% through the cycle experiment test after 1000 cycles.
Highlights
IntroductionNanomaterials have been extensively studied [1–3]. More and more electronic products and electric vehicles are coming into people’s lives in the past decade, following the increased demand for electric energy storage systems
In recent years, nanomaterials have been extensively studied [1–3]
Rutile TiO2 was prepared with a simple hydrothermal reaction progress based on the literature [39]; in our experiment, the conductive glass of FTO was used as the electrode substrate, on which the electrode materials were grown
Summary
Nanomaterials have been extensively studied [1–3]. More and more electronic products and electric vehicles are coming into people’s lives in the past decade, following the increased demand for electric energy storage systems. The electrochemical supercapacitor, as an excellent electric energy storage device, attracts extensive research interests [4–8], because of the good cycle stability and excellent reversibility, fast recharge capability, cleanliness and environmental friendliness, high power density, and so on. Manganese dioxide (MnO2) is a very important electrode material because of the low cost, abundant reserves, ease of synthesis, and environmental protection and other outstanding characteristics [32–35]; the most important is that MnO2 has very high theoretical specific capacitance. It should be noted that the favorable electrode architecture design of conductive FTO as the current collector decorated by the hierarchical structure of the TiO2/MnO2 core/shell nanocomposite can achieve rapid ion and electron migration reactions simultaneously due to the structure of the vertical array and the porous abundance, which enhanced the activity of the electrode, thereby reducing internal resistance and improving capacitor performance. We have studied the electrochemical properties of materials, which presented good capacitive properties in terms of high capacitance, low internal resistance, good rate capability, and long cycling stability, presenting great potential application for supercapacitors
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