Novel Energy Storage Center For High-Performance Rechargeable Aqueous Hybrid Zinc Energy Storage

Long cycle-life, low cost, and rechargeable aqueous zinc batteries are marketable energy storage systems for scalable applications. The graphene is a potential cathode, but it tends to strongly achieve effective zinc-ion storage because of surface texture properties. Herein, we synthesize a functional holey graphene electrode via a facile diazotization method. The functional groups (-NH- and -SO4H groups) are used as the redox centers of the internal ion reservoir to ensure the high performance of the reversible and efficient zinc-ion batteries. The unique surface structure of graphene serves as the ion carrier to provide electrochemical double-layer adsorption with SO42-. The hybrid mechanism endows the batteries with superior electrochemical performance. The highly conductive and holey graphene acts as the matrix to facilitate the excellent electron and proton transport. The battery possesses an excellent performance with a high capacity, high rate performance (234 mA h g(-1) at 0.1 A g(-1) and 101 mA h g(-1)( )even at 10 A g(-1)), and long-cycle lifetime (maintaining 98% at a large current density of 10 A g(-1) after 4000 cycles). Furthermore, the quasi-solid-state soft zinc-ion battery displays stable electrochemical performance. A new door is opened about graphene-based materials as the cathode for high-performance rechargeable zinc energy storage.