NiMoO4/g-C3N4 was fabricated by a hydrothermal method and used as an electrode material in a supercapacitor. The samples were characterized by XRD, FTIR, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to study the physical and structural properties of the as-prepared NiMoO4/g-C3N4 material. The electrochemical responses of pristine NiMoO4 and the NiMoO4/g-C3N4 nanocomposite material were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). From the CD studies, the NiMoO4/g-C3N4 nanocomposite revealed a higher maximum specific capacitance (510 Fg−1) in comparison to pristine NiMoO4 (203 Fg−1). In addition, the NiMoO4/g-C3N4 composite electrode material exhibited high stability, which maintained up to 91.8% capacity even after 2000 charge-discharge cycles. Finally, NiMoO4/g-C3N4 was found to exhibit an energy density value of 11.3 Whkg−1. These findings clearly suggested that NiMoO4/g-C3N4 could be a suitable electrode material for electrochemical capacitors.

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Construction of the Z-scheme heterojunction photocatalyst achieved highly improved photocatalytic ability by its high redox ability of the photoinduced e − -h + pairs. In the study, Z-scheme g-C 3 N 4 /BiYWO 6 heterojunction photocatalyst is prepared by the single step hydrothermal method. Further, its photocatalytic ability was assessed by degrading methylene blue under visible light exposure. Particularly, the optimized 30 wt. % of g-C 3 N 4 in the g-C 3 N 4 /BiYWO 6 composite exposes almost complete degradation after 90 min, that is ~ 3.0 times greater than the bare BiYWO 6 and g-C 3 N 4 with the rate constant value 0.032 min − 1 . Experimentally, the radical trapping studies indicates O 2 . − and .OH radicals are playing vital role in the photocatalytic degradation process. Also, Z-scheme g-C 3 N 4 /BiYWO 6 heterojunction photocatalyst exhibits excellent photoelectrochemical property and it is stable after three cycles, which indicates its good reusability nature. These enhancements are due to the newly formed heterostructure that facilitates the migration and separation e ciency of the photoproduced e − -h + pairs. Hence, the synthesized Z-scheme g-C 3 N 4 /BiYWO 6 heterostructure could be an excellent material for wastewater remediation works.

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