二氧化锰超薄纳米片在活性炭表面的负载及其超电容性能研究

Deposition of Ultrathin MnO_2 Nanoflakes on Activated Carbon Surface and Its Supercapacitance Performance

以活性炭(AC)与高锰酸钾为原料,通过简单的氧化还原化学反应一步合成了活性炭-二氧化锰超薄纳米片(AC-MnO_2)的复合材料。采用X-射线衍射仪(XRD)、Raman激光光谱仪、扫描电子显微镜(SEM)等对其形貌、结构进行表征,借助于循环伏安法(CV)和恒电流充放电法对其超电容性能进行研究。结果显示经过反应在活性炭的表面沉积了一层连续的厚度只有2-3nm二氧化锰纳米片。鉴于其特殊的结构,复合材料制备的电极在1MNa_2SO_4的电解液中显示了优异的电化学性能,是一种有潜力的超电容电极材料。

Composites based on ultrathin MnO_2 nanoflakes and activated carbon(AC-MnO_2) were prepared through a facile redox reaction between activated carbon(AC) and potassium permanganate. The structure and morphology of AC-MnO_2 were characterized by X-ray diffraction(XRD), Raman spectra, scanning electron microscope(SEM).The supercapacitance performance was studied using cyclic voltammetry(CV) and galvanostatic charging-discharging method. The results show that a continuous layer of ultrathin MnO_2 nanoflakes with thickness of 2-3 nm were deposited on the outer surface of activated carbon. AC-MnO_2 displays a high electrochemical performance in the electrolyte of 1 M Na_2SO_4 benefiting its structure, implying the broad application prospects as supercapacitor electrodes.