Organic-inorganic hybrid electrode engineering for high-performance asymmetric supercapacitor based on WO3-CeO2 nanowires with oxygen vacancies

Although WO 3 with high theoretical capacitance has a future in the field of energy storage, its electrode processing to obtain high capacitance is still a challenge. Here, we propose an innovative electrode structure design by utilizing PEDOT and PEDOT:PSS to sequentially assemble with the oxygen vacancies-enriched WO 3 and WO 3 -CeO 2 hybrid nanowires on the glassy carbon (GC). As-prepared PEDOT:PSS/WO 3 /PEDOT/GC and PEDOT:PSS/WO 3 -CeO 2 /PEDOT/GC electrodes show high areal capacitance of 1139.6 and 1310 mF cm −2 at 2 mA cm −2 , respectively, greater than 822.3 mF cm −2 of the WO 3 -PTFE-C/GC. The asymmetric supercapacitor based on PEDOT:PSS/WO 3 -CeO 2 /PEDOT and PEDOT:PSS/RuO 2 /PEDOT electrodes works at 1.6 V high working voltage, delivers an energy density of 0.61 Wh m −2 at power density of 8.22 W m −2 . Therefore, the electrode structure design will be suitable to improve the capacitance performance of other low-conductivity active materials.