CoFe Alloy-Decorated Interlayer with a Synergistic Catalytic Effect Improves the Electrochemical Kinetics of Polysulfide Conversion

• DOI: 10.1021/acsami.1c17374
• Publication Date: 2021-11-19T23:46:33Z
• Authors: Ning Gao; Bao Li; Yujiao Zhang; Wenbiao Li; Xue Li; Jie Zhao; Wence Yue; Zhenyu Xing; Bao Wang
• Keywords: Bimetallic strip; Polysulfide

Good electrical conductivity, strong catalytic activity, high interaction with lithium polysulfides (LIPSs), simple method, and low cost should be considered for the design preparation of high-performance electrochemical catalysts that catalyze conversion LIPSs. In this work, we designed a bimetallic alloyed multifunctional interlayer multiple adsorption/catalysis sites. The interwoven carbon fibers derived from bacterial cellulose (BC) not only contribute to reducing metal ions metals but also confine growth Co-Fe alloys formed in situ. supported on is very effective LIPSs due its adsorption addition, synergistic effect between Fe Co species leads excellent bifunctional activity. Through detailed analysis theoretical calculations, revealed CoFe@CNFs has superior electrocatalytic lithium-sulfur (Li-S) batteries can deliver satisfactory rate cycle performance. At current density 2C, discharge capacity still reach 627 mAh g-1. 1C, Coulombic efficiency maintained at level close 100% during whole process satisfying decay 0.08% per cycle. More importantly, even if ambient temperature drops 0 °C, Li-S battery using charged discharged normally shows acceptable capacity, which it good kinetics.