B-site W ion-doped La0.5Sr0.5Co1−xWxO3−δ perovskite nanofibers with defects as bifunctional oxygen catalysts for rechargeable zinc-air batteries

B-site W ion-doped La_0.5Sr_0.5Co_1−xW_xO_3−δ perovskite with defects was used as catalyst for rechargeable Zn–air batteries, and the voltage gap increased 0.09 V within 111 h at a constant charge and discharge current.