Ultrahigh‐Efficiency Zinc‐Air Batteries Enabled by Defect‐Engineered Biomass Carbon and Dynamic Nickel Redox Mediation

and 77% after 400 h, which is rarely reported. This work elucidates the intricate mechanism of defect formation during biomass pyrolysis and presents a scalable, cost-effective strategy for producing high-efficiency catalysts, offering a promising strategy toward advanced energy storage systems.