Long‐term performance of a zinc‐silver/air hybrid flow battery with a bifunctional gas‐diffusion electrode at high current density

This work demonstrates an improved cell design of a zinc-silver/air hybrid flow battery with two-electrode configuration intended to extend cycling lifetime high specific capacities up 66.7 mAh cm-2 at technically relevant current density 50 mA cm-2. A approach combines the advantages both zinc-air and zinc-silver batteries enabling enhanced energy efficiency while maintaining capacity. pulsed charging protocol is applied maintain compact zinc deposits on highly porous copper foam, which extends capacity compared planar surface. The single successfully operated for 216 charge-discharge cycles (t = 756.10 h) after interruption 47 163.20 h), reveals that gas-diffusion electrode aging first limitation. At end operation, accumulation in inlet zone set second limitation driven by progressively shorter discharge associated again electrode. Despite zincate ion depletion final irregular deposition, post-mortem analysis showed no dendrites, only structure, confirming benefits current. Developments within this path could further raise technological prospects battery. article protected copyright. All rights reserved.