Abstract
the bifunctional catalyst is one of the crucial components of rechargeable metal-air batteries, which should have good stability and high catalytic activity for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) during the discharging and charging processes, respectively. Herein, high-performance, non-precious metal-based hybrid bifunctional catalysts are developed from post-synthesis integration of spinel MnCo2O4 nanocrystals with nanocarbon materials. The hybrid catalysts exhibited comparable ORR activity and superior OER activity as compared to a commercial 30 wt.% Pt on carbon black (Pt/C). Rechargeable zinc-air batteries using these spinel-nanocarbon hybrid catalysts on cathode was successfully operated for 64 discharge-charge cycles (or 768 h equivalent), which significantly out-performed the Pt/C counterpart that could only survive up to 108 h under similar test conditions.
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