%0 Journal Article
%T Uniform MnCo2O4 Porous Dumbbells for Lithium-Ion Batteries and Oxygen Evolution Reactions
%J -
%D 2018
%R https://doi.org/10.1021/acsami.7b19719
%X Three-dimensional (3D) binary oxides with hierarchical porous nanostructures are attracting increasing attentions as electrode materials in energy storage and conversion systems because of their structural superiority which not only create desired electronic and ion transport channels but also possess better structural mechanical stability. Herein, unusual 3D hierarchical MnCo2O4 porous dumbbells have been synthesized by a facile solvothermal method combined with a following heat treatment in air. The as-obtained MnCo2O4 dumbbells are composed of tightly stacked nanorods and show a large specific surface area of 41.30 m2 g每1 with a pore size distribution of 2每10 nm. As an anode material for lithium-ion batteries (LIBs), the MnCo2O4 dumbbell electrode exhibits high reversible capacity and good rate capability, where a stable reversible capacity of 955 mA h g每1 can be maintained after 180 cycles at 200 mA g每1. Even at a high current density of 2000 mA g每1, the electrode can still deliver a specific capacity of 423.3 mA h g每1, demonstrating superior electrochemical properties for LIBs. In addition, the obtained 3D hierarchical MnCo2O4 porous dumbbells also display good oxygen evolution reaction activity with an overpotential of 426 mV at a current density of 10 mA cm每2 and a Tafel slope of 93 mV dec每1
%U https://pubs.acs.org/doi/10.1021/acsami.7b19719