The
catalysis of covalent organic frameworks (COFs) in Li–S
chemistry is largely blocked by a weak chemical interaction and low
conductivity. Herein, a new kind of diketopyrrolopyrrole (DPP)-based
COF is in situ fabricated onto the carbon nanotube (CNT) surface (denoted
as COF@CNT) to uncover the electrocatalysis behavior by its strong
chemical interaction and highly conductive property. We declare that
the electrocatalytic activity of DPP-COF can be maximized by introducing
an appropriate content of CNT (66 wt %); the analyses including density
functional theory calculations, X-ray photoelectron spectroscopy,
Fourier transform infrared, and Raman show that the DPP moiety can
mediate the conversion of polysulfides contributed by a CO/C–O
bonding conversion. Hence, the modified battery shows a 0.042% decay
rate over 1000 cycles and achieves a desirable capacity of 8.7 mAh
cm–2 with 10 mg cm–2 sulfur loading
and lean electrolyte (E/S = 5). This work will inspire the rational
design of COF@support hybrids for various electrocatalysis applications.
A new electrochemical procedure for electrosynthesis of organic carbonates from CO 2 and alcohols has been established in CO 2 -saturated room temperature ionic liquid BMIMBF 4 solution, followed by addition of an alkylating agent. The synthesis was carried out under mild (P CO 2 =1.0 atm, T = 55 uC) and safe conditions. The use of volatile and toxic solvents and catalysts as well as of any additional supporting electrolytes has been avoided. The influence of temperature, cathode material, working potential, alcohol concentration and the charge passed on the reaction using methanol (1a) as the model compound was examined. The ionic liquid used for the reaction was recyclable. The obtained results showed that the primary and secondary alcohols were converted in good yields, whereas tertiary alcohol and phenol were unreactive.
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