Mesoporous α-iron oxide@graphitized-carbon nitride nanocomposites (α-Fe₂O₃@g-C₃N₄-NCs) were synthesized using urea-formaldehyde (UF) resins at 400 °C/2 h. The mesoporous nature of the prepared nanocomposites was observed from electron microscopy and surface area measurements. The electrochemical measurements show the bifunctional nature of mesoporous α-Fe₂O₃@g-C₃N₄-NCs in electrolysis of water for oxygen evolution and oxygen reduction reactions (OER/ORR) using 0.5 M KOH. Higher current density of mesoporous α-Fe₂O₃@g-C₃N₄-NCs reveals the enhanced electrochemical performance compared to pure Fe₂O₃ nanoparticles (NPs). The onset potential, over-potential and Tafel slopes of mesoporous α-Fe₂O₃@g-C₃N₄-NCs were found lower than that of pure α-Fe₂O₃-NPs. Rotating disc electrode experiments followed by the K-L equation were used to investigate 4e⁻ redox system. Therefore, the mesoporous α-Fe₂O₃@g-C₃N₄-NCs bifunctional electro-catalysts can be considered as potential future low-cost alternatives for Pt/C catalysts, which are currently used in fuel cells.

In this paper, we report the synthesis of cube shaped nanoparticles of CoWO₄ (∼30 nm) by molten salts and their bifunctional electro-catalytic activities in water redox reactions for oxygen evolution and oxygen reduction reactions (OER and ORR).

Magnetic nanoparticles gained considerable attention in last few years due to their remarkable properties. Superparamaganetism, non-toxicity, biocompatibility, chemical inertness, and environmental friendliness are some of the properties that make iron oxide nanoparticles (IONPs) an ideal choice for biomedical applications. Along with being easily tuneable and a tailored surface for conjugation of IONPs, their physio-chemical and biological properties can also be varied by modifying the basic parameters for synthesis that enhances the additional possibilities for designing novel magnetic nanomaterial for theranostic applications. This review highlights the synthesis, surface modification, and different applications of IONPs for diagnosis, imaging, and therapy. Furthermore, it also represents the recent report on the application of IONPs as enzyme mimetic compounds and a contrasting agent, and its significance in the field as an anticancer and antimicrobial agent.

NiWO₄ nanobricks were used as photocatalysts in the degradation of organic pollutants in neutral and basic media.