Abstract
The charging and discharging processes of rechargeable Zn-air batteries (ZABs) require the use of precious metal catalysts (Pt and RuO2) that are expensive. Therefore, preparing efficient, stable, and affordable metal bifunctional oxygen electrocatalysts compatible with both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial. Herein, a nanoflower-like Co9S8/Co1-xS/WS2 bifunctional oxygen electrocatalyst with a layered structure has been prepared. The cobalt sulfide serves as the main active site and the synergistic interaction between the multi-components modulates the electronic structure of the active site and generates abundant S vacancies, thereby effectively improving the bifunctional oxygen electrocatalytic performance. The electrocatalytic activity of the prepared catalyst for ORR/OER is close to that of commercial noble metal catalysts. When Co9S8/Co1-xS/WS2 is used as the cathode material in Zn-air batteries, the batteries exhibit high specific capacity (822.6 mAh gZn−1), excellent energy density (958.9 Wh kgZn−1), as well as a battery charge/discharge cycling time that was twice that of the commercial catalyst PtC+RuO2.
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