1. Building synergistic multiple active sites in branch-leaf nanostructured carbon nanofiber derived from MOF/COF hybrid for flexible wearable Zn-air battery.
- Author
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Liu, Longlong, He, Quanfeng, Dong, Senjie, Wang, Minghui, Song, Yuqian, Diao, Han, and Yuan, Ding
- Subjects
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ENERGY storage , *X-ray photoelectron spectroscopy , *PHOTOELECTRON spectroscopy , *HYBRID materials , *OXYGEN evolution reactions , *ALKALINE batteries , *CARBON nanofibers , *ELECTRIC batteries - Abstract
An efficient 3D bifunctional nanofiber electrocatalyst with synergistic multiple active sites for high-performance aqueous/solid ZABs was developed by electrospinning and MOF/COF in-situ growth strategy. [Display omitted] Covalent organic frameworks (COFs) and metal–organic frameworks (MOFs) have attracted growing attention in electrochemical energy storage and conversion systems (e.g., Zn-air batteries, ZABs) owing to their structural tunability, ordered porosity and high specific surface area. In this work, for the first time, the three-dimensional (3D) highly open catalyst (CNFs/CoZn-MOF@COF) possessing hierarchical porous structure and high-density active sites of uniform cobalt (Co) nanoparticles and metal-N x (M-N x , M = Co and Zn) is demonstrated, which is fabricated using electrospinning technique in combination with MOF/COF hybridization strategy and direct pyrolysis. Benefiting from the well-designed branch-leaf nanostructures, plentiful and uniform active sites on the MOF/COF-derived carbon frameworks, as well as the synergistic effect of multiple active sites, CNFs/CoZn-MOF@COF catalyst achieves superior electrocatalytic activity and stability towards both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) with a small potential gap (ΔE = 0.75 V). In situ Raman spectroscopy and X-ray photoelectron spectroscopy results indicate that the CoOOH intermediates are the main active species during OER/ORR. Significantly, both aqueous and all-solid-state rechargeable ZABs assembled with CNFs/CoZn-MOF@COF as the air cathode show high open-circuit potential, outstanding peak power density, large capacity and long cycle life. More impressively, the obtained all-solid-state ZAB also displays superb mechanical flexibility and device stability under different, showcasing great application deformations potential in portable and wearable electronics. This work provides a new insight into the design and exploitation of bifunctional catalysts from MOF/COF hybrid materials for energy storage and conversion devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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