材料科学
化学工程
电池(电)
纳米颗粒
多面体
碳纤维
氮气
兴奋剂
纳米技术
无机化学
光电子学
化学
复合材料
有机化学
数学
功率(物理)
物理
量子力学
几何学
复合数
工程类
作者
Zhen Tong,Chao Lv,Yao Zhou,Pengfang Zhang,Chengcheng Xiang,Zhengang Li,Zhen Wang,Zong‐Kui Liu,Jun‐Tao Li,Shi‐Gang Sun
出处
期刊:Small
[Wiley]
日期:2022-10-17
卷期号:18 (48)
被引量:4
标识
DOI:10.1002/smll.202204836
摘要
Abstract The lithium–oxygen (Li–O 2 ) battery with high energy density of 3860 Wh kg −1 represents one of the most promising new secondary batteries for future electric vehicles and mobile electronic devices. However, slow oxygen reduction/oxygen evolution (ORR/OER) reaction efficiency and unstable cycling performance restrain the practical applications of the Li–O 2 battery. Herein, Ru‐modified nitrogen‐doped porous carbon‐encapsulated Co nanoparticles (Ru/Co@CoN x –C) are synthesized through reduction of Ru on metal–organic framework (MOFs) pyrolyzed derivatives strategies. Porous carbon polyhedra provide channels for reactive species and stable structure ensures the cyclic stability of the catalyst; abundant Co–N x sites and high specific surface area (353 m 2 g −1 ) provide more catalytically active sites and deposition sites for reaction products. Theoretical calculations further verify that Ru/Co@CoN x –C can regulate the growth of Li 2 O 2 to improve reversibility of Li–O 2 batteries. Li–O 2 batteries with Ru/Co@CoN x –C as cathode catalyst achieve small voltage gaps of 1.08 V, exhibit excellent cycle stability (205 cycles), and deliver high discharge specific capacity (17050 mAh g −1 ). Furthermore, pouch‐type Li–O 2 batteries that maintain stable electrochemical performance output even under conditions of bending deformation and corner cutting are successfully assembled. This study demonstrates Ru/Co@CoN x –C catalyst's great application potential in Li–O 2 batteries.
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