Regulating the Electronic Structure of Metal-Organic Frameworks by Introducing Mn for Enhanced Oxygen Evolution Activity.

The construction of low-cost and highly efficient oxygen evolution electrocatalysts is paramount for clean and sustainable hydrogen energy. In recent years, metal-organic framework (MOF) OER electrocatalysts have attracted tremendous research attention. Herein, we report a simple and facile strategy to construct bimetallic MOFs (named CoMn 0.01 ) for enhancing OER catalytic performance. Significantly, CoMn 0.01 exhibited remarkable OER activity (255 mV at 10 mA cm -2 ) and a low Tafel slope of 66 mV dec -1 , superior to those of commercial benchmark electrocatalysts (RuO 2 , 352 mV, 178 mV dec -1 ). Besides, the catalyst demonstrated outstanding longevity for 144 h at a current density of 100 mA cm -2 . Mn doping can regulate the electronic structure of Co MOFs, which optimizes charge transfer capability and improves conductivity.