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Submicron-sized mesoporous nickel ferrite (NiFe 2 O 4 ) spheres were prepared by an aerosol spray pyrolysis method using Pluronic F127 as a structure-directing agent, and their photocatalytic performance for hydrogen (H 2 ) evolution was examined in an aqueous MeOH solution by visible light irradiation (λ > 420 nm). The structure of the spherical mesoporous nickel ferrites was studied by transmission electron microscopy, powder X-ray diffraction, and N 2 adsorption–desorption isotherm measurements. Mesoporous NiFe 2 O 4 spheres of high specific surface area (278 m 2 g –1 ) with a highly crystalline framework were prepared by adjusting the amount of structure-directing agent and the calcining condition. High photocatalytic activity of mesoporous NiFe 2 O 4 for H 2 evolution from water with methanol was achieved due to the combination of high surface area and high crystallinity of the nickel ferrites.
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Hong et al. (2014) studied this question.
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