Department of Chemistry, Northeastern University , Shenyang, 110819, China.
ACS Appl Mater Interfaces. 2014 Aug 13;6(15):12656-64. doi: 10.1021/am502630g. Epub 2014 Jul 22.
Electrochemical codeposition of vanadium oxide (V2O5) and polypyrrole (PPy) is conducted from vanadyl sulfate (VOSO4) and pyrrole in their aqueous solution to get V2O5-PPy composite, during which one-dimensional growth of polypyrrole (PPy) is directed. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) are used to characterize the composite, while scanning electron microscopy (SEM) is used to investigate their morphologies. Cyclic voltammetry (CV), chronopotentiometry (CP) for galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) are used to study electrochemical activities and pseudocapacitive properties of the composite. The influences of VOSO4 to pyrrole ratio in the electro-codeposition solution on morphologies and pseudocapacitive properties of the composite are discussed. Due to the organic-inorganic synergistic effect, V2O5-PPy composite exhibits good charge-storage properties in a large potential window from -1.4 to 0.6 V vs SCE, with a specific capacitance of 412 F/g at 4.5 mA/cm(2). A model supercapacitor assembled by using the V2O5-PPy composite as the electrode materials displays a high operating voltage of 2 V and so a high energy density of 82 Wh/kg (at the power density of 800 W/kg).
电化学共沉积法从硫酸氧钒（VOSO4）和吡咯在其水溶液中得到 V2O5-PPy 复合材料，在此过程中，指导了聚吡咯（PPy）的一维生长。X 射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）用于表征复合材料，而扫描电子显微镜（SEM）用于研究其形态。循环伏安法（CV）、恒电流充放电的 chronopotentiometry（CP）和电化学阻抗谱（EIS）用于研究复合材料的电化学活性和赝电容性能。讨论了电共沉积溶液中 VOSO4 与吡咯的比值对复合材料形态和赝电容性能的影响。由于有机-无机协同效应，V2O5-PPy 复合材料在相对于 SCE 为-1.4 至 0.6 V 的大电位窗口中表现出良好的电荷存储性能，在 4.5 mA/cm(2)时比电容为 412 F/g。由 V2O5-PPy 复合材料作为电极材料组装的模型超级电容器具有 2 V 的高工作电压，因此具有 82 Wh/kg 的高能量密度（在 800 W/kg 的功率密度下）。
