1 research outputs found
A Highly Conductive COF@CNT Electrocatalyst Boosting Polysulfide Conversion for Li–S Chemistry
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