Bi₂WO₆/CNO (CNO, carbon nano-onion) composites are synthesized via a facile low-cost hydrothermal method and are used pseudocapacitor electrode material. X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N₂ adsorption-desorption techniques, and X-ray photoelectron spectroscopy (XPS) measurements are used to characterize the synthesized composite powders. The electrochemical performances of the composite electrodes are studied by cycle voltammetry, charge-discharge, and electrochemical impedance spectroscopy. The results indicate that the specific capacitance of the Bi₂WO₆/CNO composite materials reaches up to 640.2 F/g at a current density of 3 mA/cm² and higher than that of pristine Bi₂WO₆, 359.1 F/g. The capability of the prepared pseudocapacitor remains 90.15% after 1,000 cycles of charge-discharge cycling measurement. The cell performance and stability can be enhanced by further optimization and modification of the composition and microstructure of the electrode of the cell.

通过简便、低成本的水热法合成了Bi ₂ WO ₆ /CNO（CNO，碳纳米洋葱）复合材料，并用作赝电容器电极材料。 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FT-IR)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、N ₂吸附-解吸技术和 X 射线光电子能谱 (XPS) 测量用于表征合成的复合粉末。通过循环伏安法、充放电法和电化学阻抗谱研究了复合电极的电化学性能。结果表明，在3 mA/cm ²电流密度下，Bi ₂ WO ₆ /CNO复合材料的比电容达到640.2 F/g，高于原始Bi ₂ WO _{6 的}359.1 F/g。所制备的赝电容器在充放电循环测试1000次后容量仍保持在90.15%。通过进一步优化和修饰电池电极的成分和微观结构，可以提高电池的性能和稳定性。