Hierarchical <scp>CoFe</scp> @ <scp>N‐Doped</scp> Carbon Decorated Wood Carbon as Bifunctional Cathode in Wearable <scp>Zn‐Air</scp> Battery

Rechargeable Zn-air batteries (ZAB) have drawn extensive attention due to their eco-friendliness and safety. However, the lack of high-performance low-cost oxygen redox reactions (OER ORR) catalysts has become one main stumbling blocks in development. Herein, we successfully fabricate a CoFe nanobubble encapsulated nitrogen-doped carbon nanocage on wood support ([email protected]/WC) via pyrolysis novel Prussian blue analog (PBA)/spruce precursor. The hierarchical [email protected]/WC catalyst exhibits an excellent potential difference 0.74 V between OER at 10 mA cm−2 half-wave ORR 0.1 M KOH, comparable recently reported preeminent electrocatalysts. Further, shows outstanding electrochemical performance liquid ZAB, with peak power density 138.9 mW specific capacity 763.5 mAh g−1. More importantly, bacterial cellulose nanofiber reinforced polyacrylic acid (BC-PAA) hydrogel electrolyte ultrahigh tensile-breaking stress 1.58 MPa. In conjunction as-prepared catalyst, BC-PAA-based wearable ZAB displays impressive rechargeability foldability, can portable electronics, such as electronic timer mobile phone, bent states. This work provides new approach toward high-activity for ZAB.