Abstract Flower-like Co0.85Se nanosheets were synthesized by Diethylenetriamine (DETA) and N-N-dimethylformamide (DMF) by a one-pot solvothermal method. The as-prepared Co0.85Se (VDETA/VDMF = 2/1) has a porous structure with a flower-like nanosheet. The flower-like Co0.85Se nanosheets exhibit high rate ability (73.2 % capacity retention from 0.5 A g−1 to 10 A g-1) and long cycle life, with about 83.3 % of the capacity retained after 10,000 cycles at 1A g-1. An activated carbon with a wide operating voltage window was selected as a negative electrode to assemble a Co0.85Se//AC ASC device. The Co0.85Se//AC ASC device with an operating voltage of 1.6 V shows an exceptionally long-life (91.67 % capacity retention after 50,000 cycles). Therefore, these flower-like Co0.85Se nanosheets with long cycle lives could be used as potential electrode materials in SCs.

中文翻译：

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一锅法合成花状Co0.85Se纳米片作为长寿命水性非对称超级电容器的负极材料

摘要 以二乙烯三胺（DETA）和NN-二甲基甲酰胺（DMF）为原料，采用一锅溶剂热法合成了花状Co0.85Se纳米片。所制备的 Co0.85Se (VDETA/VDMF = 2/1) 具有带花状纳米片的多孔结构。花状 Co0.85Se 纳米片表现出高倍率能力（从 0.5 A g-1 到 10 A g-1 的容量保持率为 73.2%）和循环寿命长，在 1A g-1 下循环 10,000 次后容量保持率约为 83.3%。 1. 选择具有宽工作电压窗口的活性炭作为负极来组装 Co0.85Se//AC ASC 装置。工作电压为 1.6 V 的 Co0.85Se//AC ASC 器件具有极长的寿命（50,000 次循环后容量保持率为 91.67%）。因此，这些花状Co0。