Design and synthesis of tungsten trioxide/polypyrrole/graphene using attapulgite as template for high-performance supercapacitors. (10th July 2019)

• Record Type: Journal Article
• Authors: Li, Ruijun; Yang, Yue; Li, Hongda; Fu, Renjun; Tan, Wensheng; Qin, Yong; Tao, Yongxin; Kong, Yong
• Is Part Of: Electrochimica acta. Volume 311(2019)
• Page Start: 123
• Page End: 131
• Publication Date: 2019-07-10
• Subjects: Tungsten trioxide/polypyrrole/graphene -- Ternary composites -- Attapulgite -- Hard template -- Supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.04.159
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Tungsten trioxide/polypyrrole/graphene (WO3 /PPy/G) was designed and synthesized by using attapulgite (ATP) as the hard template. The resultant WO3 /PPy/G ternary composites were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), cyclic voltammetry and electrochemical impedance spectroscopy (EIS), respectively. The etching and removal of ATP hard template by hydrofluoric acid (HF) result in the porous structure within the WO3 /PPy/G, which may improve the electron transfer, shorten the diffusion path of ions, and increase the contact surface between the electrolyte and active material. The existence of PPy and G can enhance the electrical conductivity and mechanical strength of the WO3 /PPy/G, respectively, leading to improved pseudocapacitance behaviors of WO3 . Moreover, the WO3 /PPy/G ternary composites display good rate performance and tolerable cyclic stability when used as supercapacitor electrodes. Graphical abstract: Image 10634 Highlights: The ternary composites of WO3 /PPy/G were synthesized by using ATP as the template. The WO3 /PPy/G exhibits regular morphology and porous structure. The WO3 /PPy/G displays favorable specific capacitance and rate capability. The WO3 /PPy/G presents enhanced cyclic stability owing to the introduction of G. The WO3 /PPy/G might be a promising electrode material in energy conversion systems.