Mesoporous Ni-Fe oxide multi-composite hollow nanocages for efficient electrocatalytic water oxidation reactions

Mesoporous NiO/NiFe2O4 multi-composite hollow nanocages via monodisperse Ni-3[Fe(CN)(6)](2) prussian blue analogue nanocube precursors were successfully synthesized. The three-dimensional (3D) mesoporous and hollow structures provided an efficient electrolyte diffusion path and a high surface area, resulting in the enhancement of electrocatalytic activities for the oxygen evolution reaction. The over-potential and Tafel slope of mesoporous NiO/NiFe2O4 multi-composite hollow nanocages were as low as 303mV at a current density of 10mA cm(-2) and 58.5 mV dec(-1), respectively. In addition, the composite showed excellent durability at approximately 60 mA cm(-2) for 12 h.