Figure 5 : Rechargeable Zn-air batteries in a tri-electrode configuration.

From: Advanced zinc-air batteries based on high-performance hybrid electrocatalysts

Figure 5

(a) A schematic of the tri-electrode configuration with CoO/N-CNT ORR catalyst loaded on CFP electrode (1 mg cm−2) and carbon-free NiFe LDH OER catalyst loaded on Ni foam (~5 mg cm−2) electrode for discharge and charge, respectively. (b) Charge and discharge polarization (V~i) curves of the tri-electrode Zn-air battery using CoO/N-CNT and NiFe LDH (red) compared with the one using Pt/C and Ir/C (black). (c) Cycling performance of the tri-electrode Zn-air battery using CoO/N-CNT and NiFe LDH at 20 mA cm−2 and a 20-h cycle period compared with the tri-electrode battery using Pt/C and Ir/C. (d) The same CoO/N-CNT and NiFe LDH electrodes from c were used for a subsequent cycling experiment with a fresh Zn anode at 50 mA cm−2 and a 4-h cycle period.