Large-capacity rechargeable batteries for mobile devices are strongly required now, and the metal-air battery is currently considered as one of the most promising rechargeable batteries with a large capacity. In this study, oxygen reduction (ORR) and oxygen evolution reaction (OER) on mesoporous MnCo 2 O 4 spinel was studied for rechargeable Zn-air battery. Comparing the prepared spinel oxides containing Fe, it was found that the ORR/OER activity of MnCo 2 O 4 was reasonably high and stably cycled. Mesoporous MnCo 2 O 4 was successfully prepared by using a hard template method with mesoporous silica (SBA-15) for an inorganic template. The obtained mesoporous MnCo 2 O 4 showed the BET surface area of 108 m 2 /g and the average pore size of 2 nm. By increasing the surface area with mesoporous structure, overpotential of MnCo 2 O 4 to ORR/OER was much decreased. Zn-air battery was prepared by using mesoporous MnCo 2 O 4 as air electrode and 4 M KOH aqueous electrolyte, the stable discharge potential and capacity were exhibited at 1.05 V and 700 mAh/g -Zn , respectively. In addition, stable charge/discharge cycles were also sustained more than 200 cycles.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)