CeO2-NiO/N,O-rich porous carbon derived from covalent-organic framework for enhanced Li-storage

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2022-08, Vol.442, p.136298, Article 136298
• Main Authors: Gu, Fengling, Chen, Kaixiang, Du, Yan, Song, Yonghai, Wang, Li
• Format: Article
• Language: English
• Subjects: Cerium dioxide; Covalent-organic framework; Heteroatom-doped porous carbon; Lithium-ion batteries; Nanocomposites; Nickel oxide
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2022.136298

[Display omitted] •A novel N,O-rich COFDHNDA-BTH is synthesized as precursors to prepare Ni-NiO/NC and CeO2-NiO/NC.•Lots of 15 nm-sized Ni-NiO and 18 nm-sized CeO2-NiO are uniformly arrayed on NC in Ni-NiO/NC and CeO2-NiO/NC.•COFDHNDA-BTH-derived N,O-doped porous carbon provides more active sites to anchor Ni-NiO and CeO2-NiO.•Cerium doping causes a larger crystal lattice for Li+ storage/transfer and enhances tenacity of composites.•The Ni-NiO/NC and CeO2-NiO/NC show long cycling stability and high reversible capacities. Heteroatom-doped porous carbon is crucial to improve energy storage performance of transition metal oxide (TMO)/carbon nanocomposites. However, their traditional template synthesis, and chemical or thermal activation methods are cumbersome and inefficient. Crystalline covalent-organic framework (COF) has customizable structure and abundant heteroatoms. Its abundant heteroatoms and ordered network structure make it to be promising precursors to prepare TMO/carbon nanocomposites. Herein, a new N,O-rich COFDHNDA-BTH with ribbon morphology was synthesized by amine-aldehyde condensation reaction. Using COFDHNDA-BTH as precursors, CeO2-doped NiO heterostructures/N,O-rich porous carbon (CeO2-NiO/NC) nanocomposites were synthesized and successfully applied for enhanced Li-storage. The N,O-rich COFDHNDA-BTH as precursors can not only avoid the cumbersome procedures and low efficiency of traditional template method but also provide more uniformly distributed active sites to anchor CeO2-NiO and hierarchical pores. Thanks to larger lattice space provided by doping of large radius cerium for Li+ insertion/de-insertion and uniformly distributed small CeO2-NiO nanoparticles with a diameter of 18 nm, the obtained 1/5CeO2-NiO/NC exhibits excellent Li-storage performance with a capacity of 852 mAh g−1 after 500 cycles at 1000 mA g−1. The simple yet efficient strategy provides a new guide to prepare CeO2-doped TMO heterostructures/NC nanocomposites for enhanced Li-storage.