Trogtalite CoSe2 nanobuds encapsulated into boron and nitrogen codoped graphene (BCN) nanotubes (CoSe2@BCN‐750) are synthesized via a concurrent thermal decomposition and selenization processes. The CoSe2@BCN‐750 nanotubes deliver an excellent storage capacity of 580 mA h g−1 at current density of 100 mA g−1 at 100th cycle, as the anode of a sodium ion battery. The CoSe2@BCN‐750 nanotubes exhibit a significant rate capability (100–2000 mA g−1 current density) and high stability (almost 98% storage retention after 4000 cycles at large current density of 8000 mA g−1). The reasons for these excellent storage properties are illuminated by theoretical calculations of the relevant models, and various possible Na+ ion storage sites are identified through first‐principles calculations. These results demonstrate that the insertion of heteroatoms, B–C, N–C as well as CoSe2, into BCN tubes, enables the observed excellent adsorption energy of Na+ ions in high energy storage devices, which supports the experimental results.
Recent research on the amine-grafted metal−organic frameworks has obviously spurred intriguing application prospects in the field of CO 2 capture; however, few of them focused on the synthetic approach, which directly determines their structural stabilities for the application. This work explores a double-solvent incorporation strategy to rapidly squeeze the molecule-level amines into the cavites of MIL-101(Cr) without any framework destruction of MOFs. Tris(2aminoethyl) amine (TAEA), ethylenediamine (ED) and triethylene diamine (TEDA) were employed to obtain
Three Co-based isostructural MOF-74-III materials with expanded pores are synthesized, with varied extent of fused benzene rings onto sidechain of same-length ligands to finely tune the pore sizes to 2.6, 2.4, and 2.2 nm. Gas sorption results for these highly mesoporous materials show that alternately arranged fused benzene rings on one side of the ligand could serve as extra anchoring sites for CO molecules with π-π interactions, conspicuously enhancing CO uptake and CO /CH and CO /N selectivity; while more steric hindrance effect towards open Co sites were imposed by ligands flanked with fused benzene rings on both sides, compromising such extra-sites enhancement. In the catalytic conversion of CO with propylene oxide to form propylene carbonate, the as-synthesized MOF-74-III(Co) with desired properties of highly exposed and accessible open Co centers, large mesopore apertures and multi-interactive sites, demonstrated higher catalytic activity compared with other two MOFs, with benzene rings fused to ligands hampering the functionality of Co centers as Lewis acid sites. Our results highlight the viability of finely tuning the expanded pores of MOF-74 isostructure and the effect of fused benzene rings as functional groups onto selective CO capture and conversion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.