Nonylphenol polybenzoxazines-derived nitrogen-rich porous carbon (NRPC)-supported g-CN/FeO nanocomposite for efficient high-performance supercapacitor application.

In this work, a straightforward and scalable method was used to generate nitrogen-rich porous carbon (NRPC), which was then incorporated with a graphitic carbon nitride and magnetite (g-CN/FeO) nanocomposite, fabricated with FeO nanoparticles as an eco-friendly and economically viable component. The fabricated NRPC/g-CN/FeO nanocomposite was applied as an electrode in supercapacitor applications. The synthesized NRPC/g-CN/FeO nanocomposite, NRPC, g-CN, and FeO were characterized by analytical and morphological analyses. The spherically shaped FeO nanoparticles were analyzed by field-emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM). The specific surface area of NRPC/g-CN/FeO was determined to be 479 m g. All the crosslinked composites showed exceptional electrochemical performance and exhibited a pseudo-capacitance behaviour. In comparison to the FeO and g-CN/FeO electrodes, the NRPC/g-CN/FeO electrode showed a lower charge-transfer resistance and higher capacitance. The prepared NRPC/g-CN/FeO electrode exhibited the highest specific capacitance of 385 F g at 1 A g compared to FeO (112 F g) and g-CN/FeO (150 F g). Furthermore, the cycling efficiency of NRPC/g-CN/FeO remained at 94.3% even after 2000 cycles. The introduction of NRPC to g-CN/FeO improved its suitability for application in high-performance supercapacitors.