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首页> 外文期刊>Journal of power sources >High performance supercapacitor based on Ni_3S_2/carbon nanofibers and carbon nanofibers electrodes derived from bacterial cellulose
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High performance supercapacitor based on Ni_3S_2/carbon nanofibers and carbon nanofibers electrodes derived from bacterial cellulose

机译：基于Ni_3S_2 /碳纳米纤维和源自细菌纤维素的碳纳米纤维电极的高性能超级电容器

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摘要

The Ni_3S_2 nanoparticles have been successfully grown on the carbon nanofibers (CNFs) derived from bacterial cellulose via a hydrothermal method, which the as-prepared composite exhibited high specific capacitance (883 F g~(-1) at 2 A g~(-1)), much more than CNFs (108 F g~(-1) at 2 A g~(-1)), and good cycle stability. The asymmetric supercapacitor was designed to contain the CNFs coated Ni_3S_2 nanoparticles (Ni_3S_2/ CNFs) as positive electrode and CNFs as negative electrode in 2 M KOH electrolyte. Due to the synergistic effects of the two electrodes, asymmetric cell showed superior electrochemical performances. The optimized asymmetric supercapacitor gave a operating potential of 1.7 V in 2 M KOH aqueous solution, exhibiting a high specific capacitance of 56.6 F g~(-1) at 1 A g~(-1) and considerably high energy density of 25.8 Wh kg~(-1) at a power density of 425 W kg~(-1). Meanwhile, Ni_3S_2/CNFs//CNFs asymmetric supercapacitor showed excellent cycling stability with 97% specific capacitance retained after 2500 cycles.
机译：Ni_3S_2纳米粒子已经通过水热法成功地在细菌纤维素衍生的碳纳米纤维（CNF）上生长，所制备的复合材料在2 A g〜（-1）时具有高比电容（883 F g〜（-1） ）），比CNF（2 A g〜（-1）时为108 F g〜（-1））大得多，并且具有良好的循环稳定性。不对称超级电容器被设计为在2 M KOH电解质中包含CNF涂覆的Ni_3S_2纳米粒子（Ni_3S_2 / CNFs）作为正电极和CNF作为负电极。由于两个电极的协同作用，不对称电池表现出优异的电化学性能。经过优化的不对称超级电容器在2 M KOH水溶液中的工作电压为1.7 V，在1 A g〜（-1）时显示出56.6 F g〜（-1）的高比电容，并且能量密度高达25.8 Wh kg功率密度为425 W kg〜（-1）时的〜（-1）。同时，Ni_3S_2 / CNFs // CNFs不对称超级电容器表现出出色的循环稳定性，在2500次循环后保留了97％的比电容。

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