4.3 Article

Lithium Ferrites@Polydopamine Core-Shell Nanoparticles as a New Robust Negative Electrode for Advanced Asymmetric Supercapacitors

期刊

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.201800128

关键词

asymmetric supercapacitors; core-shell structure; lithium ferrites; nanoparticles; negative electrode

资金

  1. National Key R&D Program of China [2016YFA0202604]
  2. Guangdong Natural Science Funds for Distinguished Young Scholar [2014A030306048]
  3. Pearl River Nova Program of Guangzhou [201610010080]
  4. Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2015TQ01C205]
  5. Technology Planning Project of Guangdong Province [2015B090927007]
  6. Fundamental Research Funds for the Central Universities [17lgzd16]
  7. Province key platforms and projects of Guangdong Universities [2017KQNCX195]

向作者/读者索取更多资源

Spinel ferrites hold great promise as attractive electrode materials for high-performance supercapacitors owing to their multiple valence states and abundant choice of metal cation. However, the main bottleneck for most of the currently reported spinel ferrite-based electrodes is relatively low specific capacitance. Herein, a new kind of lithium ferrites (Li0.5Fe2.5O4, LFO)@polydopamine (PDA) (denoted as LFO@PDA) core-shell nanoparticles with extraordinary capacitive performance as negative electrodes for aqueous asymmetric supercapacitors (ASCs) are reported first. Taking advantage of increased active sites, improved conductivity, enhanced hydrophilicity, and good strain accommodation in terms of the interesting core-shell architecture and PDA shell, the as-obtained LFO@PDA electrode reaches a remarkable capacitance of 276.4 F g(-1) and prominent durability (no any capacitance loss after 15 000 cycles). Moreover, a robust aqueous 1.8 V-ASC device with a preferable energy density of 33.9 Wh kg(-1) is also achieved based on the LFO@PDA electrode as negative electrode.

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