A comparative study of one-dimensional and two-dimensional porous CoO nanomaterials for asymmetric supercapacitor

作者：Xiao, Yuanhua^*; Dai, Andi; Zhao, Xiaobing; Wu, Shide^*; Su, Dangcheng; Wang, Xuezhao^*; Fang, Shaoming

来源：Journal of Alloys and Compounds, 2019, 781: 1006-1012.

DOI：10.1016/j.jallcom.2018.12.129

• Cobalt monoxide
• Nanoplates
• Nanobelts
• Solvothermal
• Supercapacitors

In this study, porous one-dimensional (1D) CoO nanobelts and two-dimensional (2D) CoO nanoplates were successfully fabricated by calcining single crystalline cobalt carbonate hydroxide hydrate - Co(CO3)(0.5)(OH)center dot 0.11H(2)O nanobelts and nanoplates obtained using a solvothermal method. Solvents applied in the reaction significantly affected the shape and size of Co(CO3)(0.5)(OH)center dot 0.11H(2)O. Belt-like Co(CO3)(0.5)(OH)center dot 0.11H(2)O crystals can be easy to turn into to plate-like by adjusting the volume ratio of ethylene glycol (EG) to water. The as-prepared porous CoO nanobelts, when used as the supercapacitor electrode materials, exhibit a higher specific capacitance of 1178 F g(-1) at 1 A g(-1) than porous CoO nanoplates. Asymmetric supercapacitor (ASC) based on CoO nanobelts and aqueous electrolyte also show more excellent electrochemical performance, e.g., higher energy density (68.5 Wh kg(-1) at 850.0 W kg(-1)) and long-term cycling ability.

• 出版日期2019-4-15
• 单位郑州大学; 郑州轻工业大学