Renewable wood-derived hierarchical porous,N-doped carbon sheet as a robust self-supporting cathodic electrode for zinc-air batteries

摘要

Heteroatom doped porous carbon materials have emerged as essential cathode material for metal-air battery systems in the context of soaring demands for clean energy conversion and storage.Herein,a three-dimensional nitrogen-doped carbon self-supported electrode(TNCSE)is fabricated through thermal treatment and acid activation of raw wood.The resulting TNCSE retains the hierarchical porous architecture of parent raw lumber and holds substantial defect sites and doped N sites in the carbon skeleton.Assembled as a cathode in the rechargeable zinc-air battery,the TNCSE exhibits a superior peak power density of 134.02 m W/cm^(2)and an energy density of 835.92 m Ah/g,significantly exceeding the ones reference commercial 20%Pt/C does.More strikingly,a limited performance decay of 1.47%after an ultra long-period(500 h)cycle is also achieved on the TNCSE.This work could offer a green and cost-save approach for rationally converting biomass into a robust self-supporting cathode material for a rechargeable zinc-air battery.