Layered materials are particularly attractive for supercapacitors because of their unique physical,electrical and chemical properties.Here,we demonstrate a facile and scalable electrochemical deposition method for waf...Layered materials are particularly attractive for supercapacitors because of their unique physical,electrical and chemical properties.Here,we demonstrate a facile and scalable electrochemical deposition method for wafer-scale synthesis of quasilayered tungstate-doped polypyrrole films(named TALPy)with controllable thickness and size.The as-prepared TALPy film exhibits a high gravimetric density and excellent volumetric capacitance,exceeding many high-performing carbon-and polymerbased film electrodes.Based on combined results of ex-situ X-ray diffraction(XRD),Raman and X-ray photoelectron spectroscopy(XPS),it is determined that TALPy stores charge through an ion intercalation process accompanied by change in oxidation states of polypyrrole backbone,which is referred as intercalation pseudocapacitance.All these results suggest the great promise of electrochemical deposition as a scalable and controllable bottom-up approach for synthesizing quasi-layered conductive organic-inorganic hybrid films for electrochemical energy storage applications with high volumetric performance.展开更多
基金supported by the Australian Research Council Discovery Project(No.DP190101008)Future Fellowship(No.FT190100058)the UNSW Scientia Program.H.B.L.acknowledges the University International Postgraduate Award(UIPA)PhD Scholarship from UNSW Sydney.
文摘Layered materials are particularly attractive for supercapacitors because of their unique physical,electrical and chemical properties.Here,we demonstrate a facile and scalable electrochemical deposition method for wafer-scale synthesis of quasilayered tungstate-doped polypyrrole films(named TALPy)with controllable thickness and size.The as-prepared TALPy film exhibits a high gravimetric density and excellent volumetric capacitance,exceeding many high-performing carbon-and polymerbased film electrodes.Based on combined results of ex-situ X-ray diffraction(XRD),Raman and X-ray photoelectron spectroscopy(XPS),it is determined that TALPy stores charge through an ion intercalation process accompanied by change in oxidation states of polypyrrole backbone,which is referred as intercalation pseudocapacitance.All these results suggest the great promise of electrochemical deposition as a scalable and controllable bottom-up approach for synthesizing quasi-layered conductive organic-inorganic hybrid films for electrochemical energy storage applications with high volumetric performance.
