high-performance hybrid asymmetric supercapacitors with rgo/α-fe2o3 and rgo/tio2 nanocomposites

Hybrid asymmetric supercapacitors using distinct cathode/anode materials offer enhanced energy density by expanding operational potential windows compared to symmetric configurations. in this work rgo/α-fe₂o₃ and rgo/tio₂ nanocomposites were synthesized via hydrothermal method for hybrid asymmetric supercapacitors applications. field emission scanning electron microscope (fesem) revealed uniform distribution of spherical α-fe₂o₃ and tio₂ nanoparticles on rgo sheets. the x-ray diffractometry (xrd) analysis confirmed the presence of the hematite and anatase in the rgo/α-fe2o3 and rgo/tio2 nanocomposites, respectively. additionally, in the xrd spectra of both nanocomposites, a broad peak corresponding to the (002) crystalline planes of rgo was observed. electrochemical testing showed specific capacities of 130 f/g (rgo/α-fe₂o₃) and 253 f/g (rgo/tio₂) at 5 mv/s in 1m koh. the assembled hybrid asymmetric supercapacitors (rgo/α-fe₂o₃//rgo/tio₂) achieved a 1.6 v operational potential window. power density and energy density of 1066 w kg-1 and 9.7 wh kg-1 were achieved at a current density of 1 a/g, respectively.