材料科学
电催化剂
催化作用
锂(药物)
双金属片
解吸
化学工程
吸附
钴
动力学
氧化物
硫黄
氧化还原
无机化学
电极
金属
物理化学
电化学
化学
医学
物理
工程类
量子力学
冶金
内分泌学
生物化学
作者
Dingliang Zhu,Kuandi Wang,Xiangcun Li,Xinhong Qi,Haipeng Jiang,Fangyi Chu,Guocui Cai,Hui Qiao,Xuri Wang,Gaohong He
标识
DOI:10.1021/acsami.3c19449
摘要
The long-term stability of Li–S batteries is significantly compromised by the shuttle effect and insulating nature of active substance S, constraining their commercialization. Developing efficient catalysts to mitigate the shuttle effect of lithium polysulfides (LiPSs) is still a challenge. Herein, we designed and synthesized a rose-like cobalt–nickel bimetallic oxide catalyst NiCo2O4–OV enriched with oxygen vacancies (OV) and verified the controllable synthesis of different contents of OV. Introducing the OV proved to be an efficient approach for controlling the electronic structure of the electrocatalyst and managing the absorption/desorption processes on the reactant surface, thereby addressing the challenges posed by the LiPS shuttle effect and sluggish transformation kinetics in Li–S batteries. In addition, we investigated the effect of OV in NiCo2O4 on the adsorption capacity of LiPSs using adsorption experiments and density functional theory (DFT) simulations. With the increase in the level of OV, the binding energy between the two is enhanced, and the adsorption effect is more obvious. NiCo2O4–OV contributes to the decomposition of Li2S and diffusion of Li+ in Li–S batteries, which promotes the kinetic process of the batteries.
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