Lithium–sulfur (Li–S) batteries hold great promise for the next generation of high energy density systems. However, sluggish sulfur conversion and the shuttle effect of polysulfides severely limit their commercial applications. Herein, a multifunctional covalent organic framework (Ni-COF) with extended π-d conjugated structure was synthesized and used for separator modification to overcome the obstacles in Li–S batteries. Ni-COF inherits the advantages of both COFs and conductive metal–organic frameworks, while compensating for their respective disadvantages. The abundant oxygen-containing groups in Ni-COF act as chemical adsorption sites to inhibit the shuttle effect of polysulfides. The designed π-d conjugated structure enhances electrical conductivity and provides high-density metal catalytic sites, thereby facilitating the conversion of polysulfides and enhancing the reaction kinetics of Li–S batteries. Consequently, the Li–S batteries with Ni-COF@PP separator exhibit remarkable rate performance of 719 mA h g−1 at 4 C, along with a low attenuation rate of 0.087% per cycle over 300 cycles at 1 C. This study proposes a novel strategy for the rational design of COFs in Li–S batteries.
Correction for ‘Exploring the use of rigid 18-membered macrocycles with amide pendant arms for Pb(II)-based radiopharmaceuticals’ by Charlene Harriswangler et al., Inorg. Chem. Front., 2024, 11, 1070–1086, https://doi.org/10.1039/D3QI02354K.
Luminescent two-photon (2P) absorbing lanthanide(III) complexes hold great promise for microsocpy imaging of biological samples. Conjugating such a complex to well-chosen cell penetrating peptides (CPP) allows its controlled delivery to the cytosol of live cells. However, alkoxy–phenyl–ethynyl–picolinate, one of the best antennae for 2P sensitization of Eu3+, undergoes side reactions at its ethynyl group during peptide synthesis or in biological media and thus cannot be used to create such a conjugate. In this article, we evaluate the effect of substituting the ethynyl group by a phenyl one. We describe the synthesis of conjugates of the TAT CPP with Eu3+ complexes featuring amido–phenyl–phenyl–picolinamide, alkoxy–phenyl–phenyl–picolinamide and amido–phenyl–phenyl–picolinate ter-aryl antennae and compare their spectroscopic properties to those of analogues with bi-aryl antennae, including the amido–phenyl–picolinamide already used for 2P live cell imaging. The absorption spectrum of the ter-aryl antennae is red-shifted and better covers the active spectral range for 2P excitation by a Ti-sapphire laser. Among compounds with ter-aryl antennae, those with an amido electron donating group are the most interesting, showing brightness ca. 4 times higher than their bi-aryl counterparts, and similar to the ethynyl-containing antenna. 2P microscopy imaging of live cells incubated with the TAT-Eu3+ conjugate and dFFLIPTAT, a non-luminescent CPP that promotes cytosolic delivery, showed diffuse cytosolic staining of the Eu3+ probe. The ter-aryl-based probes showed superior performances compared to bi-aryl, with ca. 80% of the cells showing Eu3+ staining of the cytosol.
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