碘
锌
催化作用
材料科学
电极
Atom(片上系统)
化学工程
无机化学
化学
物理化学
有机化学
冶金
计算机科学
工程类
嵌入式系统
作者
Wentao Qu,Jian Zhu,Guozhong Cao,Shulin Chen,Yongwen Tan,Baohui Chen,Ming Zhang
出处
期刊:Small
[Wiley]
日期:2024-01-17
卷期号:20 (26)
被引量:17
标识
DOI:10.1002/smll.202310475
摘要
Abstract Zinc‐iodine batteries (Zn‐I2) are extremely attractive as the safe and cost‐effective scalable energy storage system in the stationary applications. However, the inefficient redox kinetics and “shuttling effect” of iodine species result in unsatisfactory energy efficiency and short cycle life, hindering their commercialization. In this work, Ni single atoms highly dispersed on carbon fibers is designed and synthesized as iodine anchoring sites and dual catalysts for Zn‐I2 batteries, and successfully inhibit the iodine species shuttling and boost dual reaction kinetics. Theoretical calculations indicate that the reinforced d‐p orbital hybridization and charge interaction between Ni single‐atoms and iodine species effectively enhance the confinement of iodine species. Ni single‐atoms also accelerate the iodine conversion reactions with tailored bonding structure of I─I bonds and reduced energy barrier for the dual conversion of iodine species. Consequently, the high‐rate performance (180 mAh g −1 at 3 A g −1 ), cycling stability (capacity retention of 74% after 5900 cycles) and high energy efficiency (90% at 3 A g −1 ) are achieved. The work provides an effective strategy for the development of iodine hosts with high catalytic activity for Zn‐I2 batteries.
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