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In this work, we reported the simple one-step wet impregnation method of g-C3N4/MnO2 nanocomposites aimed at improving the photocatalytic degradation efficiency of methylene blue dye. The synthesized catalysts underwent comprehensive characterization using various techniques such as X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) to investigate their physicochemical properties. Their photocatalytic performance was evaluated by the degradation of methylene blue (MB) dye under visible light irradiation. Consequently, the MnO2/g-C3N4 nanocomposite demonstrates superior photocatalytic degradation performance compared to both bare MnO2 and g-C3N4. This enhancement is attributed to the improved efficiency of charge carrier separation and interfacial charge transfer within the nanocomposite structure. The degradation efficiency of MnO2/g-C3N4 nanocomposite was found 89% of MB under visible light irradiation at 120 min. Meanwhile, the recyclability analysis demonstrated that the MnO2/g-C3N4 nanocomposite can be recycled four times. Furthermore, the substance demonstrated positive antibacterial activity against Escherichia coli, and Staphylococcus aureus bacterial strains. These findings suggest that the MnO2/g-C3N4 nanocomposite, with its dual roles as a photocatalyst and an antibacterial agent, has potential applications in environmental decontamination. [ABSTRACT FROM AUTHOR]

Building a novel electrode with improved electrochemical behaviour has great scope in the area of supercapacitors. In this work, binder-free 1D nanograsses of Ni2P2O7/Co2P2O7 nanocomposites were grown on nickel foam through a simple hydrothermal method at different processing temperatures. A precise examination was carried out to study the influence of the processing temperature on the morphology and electrochemical attributes. Ex situ morphological pictures confirmed the reliance of structure on the hydrothermal temperature and the obtained one-dimensional morphology encouraged ion interaction through short channels. The patterned nanograsses were grown at 140 °C with uniform interspacing and exhibited better electrochemical performance due to short, diffusive 1D pathways. Using the power law, the capacitive parts of the total capacitance were elucidated. The better electrochemical performance from charge–discharge indicates that the binder-free NiP2O7/CoP2O7 1D nanograsses would be an appropriate cathode for an efficient hybrid capacitor. The optimized electrode as the cathode in the device showed better energy density and long-lasting cycle life (80% capacity retention after 2000 cycles). Our outcomes indicate that the Ni2P2O7/Co2P2O7 1D nanograss pattern has good potential for use as a cathode for hybrid supercapacitors. [ABSTRACT FROM AUTHOR]

Developing a novel electrode material with better electrochemical behavior and extended cyclability is a major issue in the field of hybrid capacitors. In this work, we propose a novel strategy for the facile synthesis of nickel-cobalt pyrophosphate nanoparticles anchored on graphitic carbon nitride (NiCoP 2 O 7 /g-C 3 N 4 ) via the simple solvothermal method. Field emission scanning electron microscopy and transmission electron microscopy analysis revealed the uniform anchoring of NiCoP 2 O 7 nanocomposite on g-C 3 N 4 nanosheets. Benefitting from the effect of amorphous nature and a conductive matrix of the NiCoP 2 O 7 /g-C 3 N 4 (NP3) composite, the material achieves a specific capacitance of 342 F g -1 at a scan rate of 5 mV s -1 . Impressively, the electrode shows long-term cycling stability with 100% capacitance retention over 5000 cycles. Employing activated carbon as an anode and as-prepared NP3 as a cathode, the assembled asymmetric hybrid cell exhibits high-energy density and exceptional cyclability (specific capacitance retention over 10 000 cycles). The outstanding electrochemical and cyclic stability is attributed to the shortest electron-ion pathway with effective interfacial interaction. The low electronic resistance of the NiCoP 2 O 7 /g-C 3 N 4 nanocomposite is revealed by varying the bias voltage variation in the electrochemical impedance spectroscopy. Our results promise better utilization of the bimetallic pyrophosphate-anchored g-C 3 N 4 matrix as a potential electrode for high-performance energy storage devices., Competing Interests: The authors declare no competing financial interest.