One pot synthesis of nanostructured bismuth fluoride tailored for symmetric supercapacitor performance

Organic molecule stabilized face-centered cubic structured bismuth fluoride (BiF₃) nanoparticles (NPs), space group: Fm-3 m, were prepared using a wet chemical synthesis route for symmetric supercapacitor application. For freestanding three electrode system, at current density (C_d) 3.3 A.g⁻¹, the material displayed a maximum specific capacitance (SC_p) value 717.3 F.g⁻¹. The symmetric device based on BiF₃ attained a maximum specific capacity (SC) value of 228.4 mAh.g⁻¹ at 0.06 A.g⁻¹. At the current density of 0.30 A.g⁻¹, the device displayed the energy density (E_d) and power density (P_d) values of 0.17 Wh.kg⁻¹ and 343.7 W.kg⁻¹, respectively. Furthermore, the fabricated symmetric supercapacitor displayed 90% of capacity retention and 95% of coulombic efficiency at 0.12 A.g⁻¹ for 1000 galvanostatic charge–discharge (GCD) cycles. The symmetric supercapacitor based on BiF₃ NPs exhibited excellent electrochemical performance, which could be an appropriate choice for application in different integrated energy storage systems.