Morphological modulation of CoFe-based metal organic frameworks for oxygen evolution reaction

The modulation of morphological structure associated with the change of metal composition within metal organic framework (MOF) is a facile and effective strategy to accelerate the charge transfer for enhancing the catalytic activity towards oxygen evolution reaction (OER). Here, we realized the morphological change of MOF by manipulating the Co composition within bimetallic CoxFe1-x-MOF. Impressively, the CoxFe1-x-MOFs with the one-dimensional nanorod array structure promoted the reaction kinetics of the catalysts. The optimized Co0.8Fe0.2-MOF composition showed a low overpotential of 237 mV at 10 mA/cm2 and a small Tafel slope of 36.3 mV/dec, which are superior than those of commercially RuO2 electrocatalysts. [Display omitted] •The morphological modulation on CoxFe1-x-MOFs has been realized.•The optimized Co0.8Fe0.2-MOF exhibits superior electrocatalytic OER activity.•The nanorod array and electron structure change promote the OER activity.