Synthesis of hierarchical NiS microflowers for high performance asymmetric supercapacitor
Synthesis of hierarchical NiS microflowers for high performance asymmetric supercapacitor
复制标题
DOI：
10.1016/j.cej.2016.10.016
复制
发表时间：
2017-01-15
影响因子：
15.1
通讯作者：
Cheng, Changjing
中科院分区：
文献类型：
--
作者：
Guan, Bing;Li, Yu;Cheng, Changjing
本文以Ni(OH)(2)为前驱体，采用硫化法制备了分级NiS微花。通过SEM、TEM、XRD、BET和XPS等手段对制备的NiS的微观结构和化学成分进行了表征。SEM分析结果表明，NiS微花由层次化纳米板组成，硫化后的表面比Ni(OH)(2)模板粗糙得多。电化学表征表明，NiS在3 M KOH电解液中具有较高的比电容（在1 A.g（-1）电流密度下为1122.7 F.g(-1)）和良好的电化学循环稳定性（在10 A.g（-1）电流密度下1000次充放电循环后仍保持97.8%的比电容）。此外，以NiS为正极，活性炭为负极的非对称超级电容器可提供31 Wh的高能量密度。在1.8 V工作电压窗口下，功率密度为0.9 kW.kg（-1）。(C) 2016 Elsevier B.V.版权所有
In this work, the hierarchical NiS microflowers were synthesized using Ni(OH)(2) as precursors through sulfuration process. The microstructure and chemical composition of as-prepared NiS was confirmed by means of SEM, TEM, XRD, BET and XPS. The SEM analysis results demonstrated that the NiS microflowers were composed of hierarchical nanoplates, and its surface was much rougher compared to that of Ni(OH)(2) templates after sulfidation. Electrochemical characterization revealed that NiS presented high specific capacitance in 3 M KOH electrolyte (1122.7 F.g(-1) at current density of 1 A.g(-1)) and good electro-chemical cycling stability (97.8% of the specific capacitance is retained after 1000 charge-discharge cycles at current density of 10 A.g(-1)). Furthermore, an asymmetric supercapacitor, NiS as the positive electrode and activated carbon as the negative electrode, delivered high energy density of 31 Wh.kg(-1) at power density of 0.9 kW.kg(-1) under operating voltage window of 1.8 V. (C) 2016 Elsevier B.V. All rights reserved.