Abstract
Developing efficient catalysts toward both oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) is the core task for rechargeable metal-air batteries. Although integration of two active components should be an effective method to produce the bifunctional catalysts in principle, traditional techniques still can not attain fine tunable surface structure during material-hybridization process. Herein, we present a facile short-time in-situ argon(Ar) plasma strategy to fabricate a high-performance bifunctional hybrid catalyst of vacancy-rich CoFe2O4 synergized with defective graphene(r-CoFe2O4@DG). Reflected by the low voltage gap of 0.79 V in two half-reaction measurements, the striking capability to catalyze ORR/OER endows it excellent and durable performance in rechargeable Zn-air batteries, with a maximum power density of 155.2 mW/cm2 and robust stability(up to 60 h). Further experimental and theoretical studies validate its remarkable bifunctional energetics root from plasma-induced surface vacancy defects and interfacial charge polarization between DG and CoFe2O4. This work offers more opportunities for reliable clean energy systems by rational interfacial and defect engineering on catalyst design.
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The authors acknowledge the scientific and technical assistance of the Australian Microscopy and Microanalysis Research Facility at the UQ Centre.
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Supported by the Project of the Australia Research Council(No.ARC DP200103043), the “111” Project of China (Nos.B07016, B17020) and the ARC Discovery Early Career Researcher Award(No.ARC DE180101030).
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40242_2020_56_MOESM1_ESM.pdf
One-step in-situ Synthesis of Vacancy-Rich CoFe2O4@Defective Graphene Hybrids as Bifunctional Oxygen Electrocatalysts for Rechargeable Zn-Air Batteries
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Wang, X., Zhuang, L., Jia, Y. et al. One-step In-situ Synthesis of Vacancy-rich CoFe2O4@Defective Graphene Hybrids as Bifunctional Oxygen Electrocatalysts for Rechargeable Zn-Air Batteries. Chem. Res. Chin. Univ. 36, 479–487 (2020). https://doi.org/10.1007/s40242-020-0056-8
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DOI: https://doi.org/10.1007/s40242-020-0056-8