Metallic CuCo2S4 nanosheets of atomic thickness as efficient bifunctional electrocatalysts for portable, flexible Zn-air batteries

A portable, flexible Zn-air battery using CuCo₂S₄ NSs as the air-cathode displays a high open circuit voltage and strong rechargeable capacity due to the excellent reversible oxygen catalytic performance of metallic CuCo₂S₄ NSs of atomic thickness with abundant defects.