A Highly Conductive COF@CNT Electrocatalyst Boosting Polysulfide Conversion for Li–S Chemistry
Jie Xu, Weiqiang Tang, Chao Yang, Ingo Manke, Nan Chen, Feili Lai, Ting Xu, Shuhao An, Honglai Liu, Zhiliang Zhang, Yongjie Cao, Nan Wang, Shuangliang Zhao, Dongfang Niu, Renjie Chen
Abstract
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 C amp; 9552;O 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