Facile fabrication of reduced graphene oxide/boron nitride hybrid films as supercapacitor electrodes with enhanced areal capacitance

The reduced graphene oxide/boron nitride (RGO/BN) hybrid film materials were prepared via ultrasonic blending, followed by the vacuum filtration film-forming and chemical reduction process. The fabricated free-standing RGO/BN hybrid films could combine the advantages of highly conductive RGO and pseudocapacitive BN. Notably, the optimized 1:1 RGO/BN hybrid film electrode delivered an areal capacitance of 513.4 mF cm⁻² at 1 mA cm⁻², which was four times larger than that of RGO film. The introduction of BN drastically improved the areal capacitance and also demonstrated excellent capacitance retention. Furthermore, a symmetric supercapacitors device was constructed using the 1:1 RGO/BN hybrid film as two symmetrical electrodes. An areal energy density of 6.8 µWh cm⁻² was attained at a power density of 800 µW cm⁻². This development opens avenues for the facile manufacturing of hybrid film as high-performance energy storage materials.