期刊
ELECTROCHIMICA ACTA
卷 191, 期 -, 页码 916-922出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.156
关键词
Manganese-cobalt oxysulfide; Electrode material; Hydrothermal; Charge storage; Binder-free
资金
- National Natural Science Foundation of China [40802013]
- Key Projects in the National Science & Technology Pillar Program [2006BAD10B04]
- Fundamental Research Funds for the Central Universities [2011YXL058, 2652015092, 2652015007]
Flower-like manganese-cobalt (Mn-Co) oxysulfide supported on Ni foam substrate is synthesized by two-step hydrothermal method as binder-free faradaic electrode for charge storage. The crystalline phase and morphology of as-fabricated materials are well-characterized by X-ray diffraction (XRD), Scan electron microscope (SEM), and X-ray photoelectron spectrum (XPS). The results demonstrate that the Mn-Co oxysulfide exists as polycrystal and sulfide are successfully partially substituted into Mn-Co oxide. Impressively, the Mn-Co oxysulfide electrode exhibits excellent electrochemical performance with an ultrahigh specific capacity of 490 C g (1) at 2 A g (1) and 415 C g (1) at 20 A g (1) which is much higher than 301 C g (1) at 2 A g (1) and 174 C g (1) at 20 A g (1)of the Mn-Co oxide nanosheets electrode. Moreover, the flower-like Mn-Co oxysulfide electrode also reveals good cycling stability with 86.5% capacity retention at high current density of 20 A g (1) after 3000 cycles. Because of the flower-like structure and partial substitution by sulfide, which provides large reaction surface area and more flexible structure, Mn-Co oxysufide electrode with excellent electrochemical performances would have great prospect for energy storage device applications. (C) 2016 Elsevier Ltd. All rights reserved.
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