Flower-like manganese-cobalt oxysulfide supported on Ni foam as a novel faradaic electrode with commendable performance

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• 作者：Meitang Liu ; ^{mtliu@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yu Fu ; Hongwen Ma ; Tianlei Wang ; Chao Guan ; Kunran Hu
• 关键词：Manganese-cobalt oxysulfide ; Electrode material ; Hydrothermal ; Charge storage ; Binder-free
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 February 2016
• 年：2016
• 卷：191
• 期：Complete
• 页码：916-922
• 全文大小：1895 K

文摘

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⁻¹of 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.