A facile route to growth of γ-MnOOH nanorods and electrochemical capacitance properties

► A novel and facile solvothermal route was developed to synthesis of γ-MnOOH nanorods. ► Single crystal γ-MnOOH nanorods were prepared without surfactant or template. ► The synthetic route requires only two reagents and can exquisite control over the morphologies of γ-MnOOH. ► γ-MnOOH nanorods have a good electrochemical capability.