|1- Najafpour, M. M., Salimi, S., Safdari, R., "Nanosized manganese oxide supported on carbon black: A new, cheap and green composite for water oxidation", International Journal of Hydrogen Energy, 42: (1), 255-264, (2017).|
Water splitting is a very promising method to produce hydrogen. However, water oxidation is a crucial step for hydrogen production since it can provide cheap electrons for proton reduction. Herein a nanosized Mn oxide immobilized on carbon black as a reasonable catalyst for water oxidation is reported. The composites were synthesized by a simple, low-cost procedure using different ratios of carbon black and Mn oxide. Catalysts were characterized by scanning electron microscopy, energy-dispersive spectroscopy (EDX), scanning electron microscope (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), electronic spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and atomic absorption spectroscopy (AAS). In the next step, the water-oxidizing activities of the composites were observed in the presence of cerium(IV) ammonium nitrate. The composites were reasonable catalysts with turnover frequencies of ∼0.07 (mmol O2/mol Mn s). In addition to the water-oxidizing activity, the self-healing for this composite in the experimental condition was also studied.