Multiple Atomic-Level Coupling Active Sites Engineering： Sulfurize Fe-N-C Catalysts with FexC/Fe Species to Enhance the Performance of Oxygen Reduction Reaction in Acid Media and Flexible Zn-Air Batteries

Yueyang Qiao,a Pengfei Yuan,c Yongfeng Hu,b Jianan Zhang,*,a Shichun Mu,*,d Jihang Zhou,b Hao Li,a Huicong Xia,a Jing He,a Qun Xu*,a