期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 647, 期 -, 页码 296-305出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.05.115
关键词
Potassium ion battery; Carbon nanosheet; Graphene; Anode; Heteroatoms
N, F-CNS-Ni electrode exhibits ultrahigh gravimetric and volumetric capacities of 404.5 mA h g-1 and 281.3 mA h cm-3 at 0.05 A/g, respectively, and a superb capacity of 259.3 mA h g-1 with a capacity retention ratio of 90 % even after 600 cycles at 5 A/g.
Constructing carbon electrodes with abundant heteroatoms and appropriate graphitic interlayer spacing remains a major challenge for achieving high gravimetric and volumetric potassium storage capacities with fast kinetics. Herein, we constructed 3D graphene-like N, F dual-doped carbon sheets induced by Ni template (N, F-CNS-Ni) with dense structure and rich active sites, providing a promising approach to address the facing obstacles. Highly reversible K-ion insertion/extraction is realized in the graphitic carbon structure, and K-adsorption capability is enhanced by introducing N/F heteroatoms. As a result, the N, F-CNS-Ni electrode exhibits ultrahigh gravimetric and volumetric capacities of 404.5 mA h g-1 and 281.3 mA h cm-3 at 0.05 A/g, respectively, and a superb capacity of 259.3 mA h g-1 with a capacity retention ratio of 90 % even after 600 cycles at 5 A/g. This work presents a simple Ni-based template method to prepare graphene-like carbon nanosheets with high packing density and rich heteroatoms, and offers mechanism insight for achieving superior K-ion storage.
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