Abstract
The design and synthesis of composite-structure-defined bifunctional oxygen reduction and evolution reactions electrocatalysts for rechargeable Zn-air batteries are highly important. Herein, a facile surface functionalization-carbonization-phosphidation strategy is proposed to construct a novel composition-structure-controllable nanomaterial from a zeolite imidazole ester framework (ZIF67), which has been applied in oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and Zn-air batteries. In the typical nanomaterial, Co and CoxP (a mixture of Co2P and CoP) were embedded in hollow N-doped carbon shell (Co/CoxP/HNC-5). The relationship between the activity and shell thicknesses of the carbonization products of ZIF67 coated with different mass ratios of polydopamine has been studied. In addition, the doped P-content showed a significant impact on the bifunctional oxygen activity, especially for Co/CoxP/HNC-5. Benefiting from the unique structure, multiple compositions, and synergistic effects, the superior bifunctional oxygen electrocatalytic activity (ΔE = 0.667 V) were obtained on Co/CoxP/HNC-5. Furthermore, Co/CoxP/HNC-5 served as an air-cathode catalyst and exhibited remarkable peak power density, specific capacity and durability in a practical Zn-air battery. This work provides a strategy for the construction of efficient bifunctional electrocatalysts with special structure and adjustable compositions.
Published Version
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