High-Power and Ultralong-Life Aqueous Zinc-Ion Hybrid Capacitors Based on Pseudocapacitive Charge Storage

This work starts the research of pseudocapacitive oxide materials for multivalent Zn2+ storage. The constructed RuO2·H2O||Zn systems exhibit outstanding electrochemical performance, including a high discharge capacity, ultrafast charge/discharge capability, and excellent cycling stability. The redox pseudocapacitive behavior of RuO2·H2O for Zn2+ storage is revealed.