材料科学
碳纤维
纳米复合材料
纳米颗粒
电化学
阴极
水溶液
化学工程
煅烧
纳米技术
硝酸锌
电极
无机化学
锌
复合材料
催化作用
化学
冶金
复合数
有机化学
物理化学
工程类
作者
Tianbing Song,Zun‐Hui Huang,Xiaoqing Niu,Xirong Zhang,Jishi Wei,Huan‐Ming Xiong
出处
期刊:Chemsuschem
[Wiley]
日期:2022-02-19
卷期号:15 (6)
被引量:27
标识
DOI:10.1002/cssc.202102390
摘要
Mn3 O4 is a promising cathode material for aqueous zinc ion batteries (ZIBs) which is a new type of low cost, eco-friendly, high security energy storage system, while those previously reported electrochemical capacities of Mn3 O4 are far from its theoretical value. In this work, Mn3 O4 nanoparticles and nitrogen-doped carbon dots (NCDs) are synthesized together through an in-situ hydrothermal route, and then calcined to be a nanocomposite in which Mn3 O4 nanoparticles are anchored on a nitrogen-doped carbon skeleton (designated as Mn3 O4 /NCDs). Although the carbon content is only 3.9 wt.% in the Mn3 O4 /NCDs, the NCDs-derived carbon skeleton provides an electrically conductive network and a stable structure. Such a special nanocomposite has a large specific surface area, plenty of active sites, excellent hydrophilicity and good electronic conductivity. Owing to these structural merits, the Mn3 O4 /NCDs electrode exhibits a preeminent specific capacity of 443.6 mAh g-1 and 123.3 mAh g-1 at current densities of 0.1 and 1.5 A g-1 in ZIBs, respectively, which are far beyond the bare Mn3 O4 nanoparticles synthesized under the similar condition. The electrochemical measurement results prove that carbon dots, as a new type of carbon nanomaterials, have strong ability to modify and improve the performance of existing electrode materials, which may push these electrode materials forward to practical applications.
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