Rational design and controllable preparation of holey MnO2 nanosheets

A novel technique for the design and controllable preparation of holey MnO₂ nanosheets was first developed by an in situ redox reaction between the MnO₂ nanosheets and adsorbed Fe²⁺ ions at room temperature, in which Fe²⁺ ions originated from a redox reaction between Cu wire and Fe³⁺ ions.