School of Chemistry and Chemical Engineering Central South University Changsha 410083 Hunan China;
School of Chemistry and Chemical Engineering Central South University Changsha 410083 Hunan ChinaHunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources Central South University Changsha 410083 Hunan China;
Gas-foaming strategy; Biomass; Hierarchically porous structure; Oxygen reduction reaction; Al–air battery;