Formation of porous CC@FexO/Co3O4-CuxO/CS photocathodes for high power-density zinc-air batteries with reduced charging potentials

Abstract

Herein, a carbon cloth supported CC@CoFeOx-CuxO was developed through a dual heterojunction engineering, and exhibited outstanding OER (overpotential of 301 mV at 10 mA·cm-2) and ORR (onset potential of 884 mV at -0.1 mA·cm-2) activities. The CoFeOx-CuxO heterojunction optimized charge transport and carrier separation efficiency. The as-fabricated zinc air batteries (ZABs) using this CC@CoFeOx-CuxO achieved a low charging potential (1.66 V) at 0.1 mA·cm-2 with high energy density (103.21 mW·cm-2) and specific capacity (795.14 mAh·g⁻¹), surpassing the Pt/C+IrO₂ systems (731.0 mAh·g⁻¹). This work provides a new strategy for designing efficient non-precious metal catalysts.