A Novel Hierarchical Nanoflower-Like Mno2 Composite Induced by Boron Doped Carbon Spheres for Efficient Oxygen Evolution Reaction in Alkaline Aqueous

MnO 2 , as one of cost-effective and abundant transition metal based electrocatalysts in oxygen evolution reaction (OER), commonly suffers from the low intrinsic activity, poor conductivity and limited available active centers, etc. Herein, based on the synthesized boron doped carbon sphere (BCS), a novel hierarchical nanoflower-like MnO 2 electrocatalyst (MnO 2 /BCS) was inductively prepared via a facile hydrothermal strategy, which was successfully confirmed via a combined characterization of SEM, TEM, EDS, FT-IR, Raman and XPS, etc. Due to introduction of BCS, the MnO 2 /BCS shows distinct nanoflower-like morphology stacked with numerous nanosheets. After systematical investigation on its electrochemical properties, the MnO 2 /BCS shows superior OER performance than that of the pristine MnO 2 . Importantly, the optimal MnO 2 /BCS 0.08 can achieve the lowest overpotential mere 170 mV at 10 mA·cm -2 and onset potential of 1.33 V together with remarkably smallest Tafel slope value of 31.43 mV dec -1 . Furthermore, this MnO 2 /BCS 0.08 also has a prominent long-term durability and stability in alkaline conditions. In conclusion, our present work demonstrates an effective strategy to enhance the OER performance of MnO 2 by incorporation of the carbon nanomaterials.