Boosted Charge Transfer in Twinborn α-(Mn₂O₃-MnO₂) Heterostructures: Toward High-Rate and Ultralong-Life Zinc-Ion Batteries

Aqueous ZIBs are one of the most promising next-generation rechargeable batteries because of the high capacity, high hydrogen evolution overpotential, and chemically stable reversible plating/stripping of the zinc electrode in the mild aqueous electrolyte. However, there are limited cathode materials that can store Zn²⁺ reversibly with superior cycling and rate capability. Herein, hierarchically porous nanorods composed of twinborn α-(Mn₂O₃-MnO₂) heterostructures are proposed as a robust cathode for Zn storage. Thanks to the hierarchically porous nanorod morphology and the abundant interface of the heterostructures involving a built-in electric field, the as-obtained twinborn α-(Mn₂O₃-MnO₂) electrode delivers a high capacity of 170 mA h g^-1 for 2000 cycles at 500 mA g^-1 and shows an excellent rate capability of up to 1.5 A g^-1 with a capacity of 124 mA h g^-1. The inspiring results achieved exhibit the enormous potential of the high-performance heterostructure cathode for fast and stable ZIBs.