Metal-organic framework derived functional MnO2 via an in-situ oxidation strategy for advanced quasi-solid-state supercapacitors
Journal of Power Sources(2023)
摘要
Accurately controlling the morphology and structure of metal oxides faces huge challenges, which also limits their applications in different fields. Here, we report an in-situ oxidization strategy to design hollow spherical MnO2 (HS–MnO2) at room temperature based on the Mn-based metal-organic framework precursor. During the in-situ oxidization process, the obtained HS-MnO2 remains a hollow spherical structure with abundant pre-inserted Na+ and oxygen vacancies, which contributes to addressing its issues of volume expansion, low ionic diffusion rate, and low electronic conductivity. Consequently, the HS-MnO2 electrode exhibits high reversible capacitance (304.3 F g−1, 0.5 A g−1), high cycle stability (77.6% capacity retention for over 20,000 cycles at 10 A g−1), and excellent rate performance in supercapacitor applications. Importantly, the MnO2-based quasi-solid-state supercapacitor can power different devices, which shows its good application prospect. Our work provides new insights into the preparation of transition metal oxides with controllable structures via a mass-productive strategy with low cost to fulfill their potential in energy storage devices.
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关键词
Metal organic framework,In-situ oxidation,Hollow spherical MnO2,Na+ pre-intercalation,Oxygen vacancy
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