催化作用
多硫化物
氧化还原
材料科学
法拉第效率
化学工程
双功能
化学
电催化剂
密度泛函理论
吸附
无机化学
阳极
电化学
电解质
电极
计算化学
物理化学
有机化学
工程类
作者
Jinyun Zheng,Chaohong Guan,Huangxu Li,Yangyang Xie,Shihao Li,Junxian Hu,Kai Zhang,Bo Hong,Yanqing Lai,Jie Li,Zhian Zhang
标识
DOI:10.1016/j.cej.2022.135940
摘要
The development of catalytic materials has become a general trend of lithium-sulfur batteries (LSBs) research. Although catalysts have been extensively studied on the sulfur reduction reaction, little is known of their role in sulfur oxidation reaction. In this study, highly dispersed vanadium carbide anchored on N-doped carbon nanotubes ([email protected]) was prepared as a bidirectional catalyst for LSBs. Density functional theory, visual adsorption experiments, symmetrical cell cyclic voltammetry, chronoamperometry and dimensionless analysis, and activation energy calculations were used to study the adsorption catalytic effect of polysulfide. Detailed experimental results indicate that [email protected] can capture polysulfide and convert it efficiently, reducing the activation energy (Ea) to considerably improve both directions of redox kinetics. Density functional calculations (DFT) confirm the adsorption strength of [email protected] and electroactivity. The bifunctional [email protected] catalyst exhibited promising practical performance in a lithium-sulfur cell, including high reversible capacity (1053 mAh g−1), excellent and steady coulombic efficiency (∼100%), and admirable battery fast charging performance (3 C). This research establishes bidirectional electrocatalysis as a promising pathway to tackle kinetic hysteresis in the redox process for LSBs.
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