Hollow Co‐Mn‐Fe Based Prussian Blue Analog Nanocubes/Carbon Nanotubes Composite as a High‐Performance Cathode Material for Aqueous Zinc‐Ion Battery

Aqueous zinc‐ion batteries (AZIBs) represent an emerging class of energy storage systems distinguished by their low cost, environmental compatibility, and high safety. In this work, hollow Co‐Mn‐Fe Prussian blue analog nanocubes integrated with a carbon nanotube network (Co‐Mn‐Fe PBA NC/CNT) were successfully synthesized and evaluated for use as a cathode in AZIBs. The combination of a hollow nanocube architecture and a conductive CNT framework not only alleviates the structural degradation typically observed in PBAs, but also establishes an efficient dual‐conducting network for efficient charge and ion transport. The as‐prepared Co‐Mn‐Fe PBA NC/CNT cathode achieves a specific discharge capacity of 151.4 mAh g −1 at 0.2 A g −1 and displays outstanding long‐term cycling stability (74.1%) after 1,000 cycles, representing a 12.4% enhancement in cycling performance compared with the Co‐Mn‐Fe PBA cathode.