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球状NiCo2S4的制备及其在KOH溶液中的电化学行为

龙升 刘依 邹攀 杨泛明 贺国文

龙升, 刘依, 邹攀, 等. 球状NiCo2S4的制备及其在KOH溶液中的电化学行为[J]. 复合材料学报, 2024, 42(0): 1-9.
引用本文: 龙升, 刘依, 邹攀, 等. 球状NiCo2S4的制备及其在KOH溶液中的电化学行为[J]. 复合材料学报, 2024, 42(0): 1-9.
LONG Sheng, LIU Yi, ZOU Pan, et al. Preparation of spherical NiCo2S4 and the electrochemical behavior in KOH solution[J]. Acta Materiae Compositae Sinica.
Citation: LONG Sheng, LIU Yi, ZOU Pan, et al. Preparation of spherical NiCo2S4 and the electrochemical behavior in KOH solution[J]. Acta Materiae Compositae Sinica.

球状NiCo2S4的制备及其在KOH溶液中的电化学行为

基金项目: 湖南省自然科学基金(2019JJ50026),湖南省教育厅科学研究项目(18B447)资助
详细信息
    通讯作者:

    杨泛明,博士,副教授,硕士生导师,研究方向为功能复合材料的开发 E-mail: ychufei@163.com

    贺国文,博士,教授,研究方向为功能复合材料及电化学 E-mail: yfanming0102@163.com

  • 中图分类号: TQ152; TB333

Preparation of spherical NiCo2S4 and the electrochemical behavior in KOH solution

Funds: The Natural Science Foundation of Hunan Province (2019JJ50026) and the Scientific Research Projects of Hunan Education Department (18B447))
  • 摘要: NiCo2S4中Ni和Co元素可以同时参与充放电过程,获得较高的放电比容量和能量密度。对NiCo2S4中双电层电容和赝电容的贡献率进行分析,有助于推动电极材料的深入开发。以乙酸钴为Co源、乙酸镍为Ni源、硫代乙酰胺为沉淀剂,通过水热合成法制备具有优异电化学性能的球状电极材料硫钴酸镍(NiCo2S4)。利用X射线衍射、X射线光电子能谱、扫描电子显微镜、透射电子显微镜、Mapping和N2吸附-脱附技术对NiCo2S4的物相、形貌、组成和孔结构进行分析,并对其在KOH电解液中的充放电行为进行探究。结果表明,球状NiCo2S4制备成功,并且Ni、Co和S的比例为1∶2.1∶4.2。NiCo2S4为立方相多晶体,晶格常数为0.9387 nm。Ni和Co分别以Ni2+/Ni3+和Co2+/Co3+的形式存在于NiCo2S4的晶格之中。NiCo2S4的孔体积为0.402 cm3/g,并且介孔比例为90.6%。NiCo2S4在KOH溶液中同时产生双电层电容和赝电容,两者所占比例分别为60.6%、39.4%。电流密度为0.2 A/g时,放电比容量为409.7 F/g,能量密度为14.2 W·h/kg。循环10000次,容量保持率为90.3%。

     

  • 图  1  NiCo2S4的XRD图

    Figure  1.  XRD diagram of NiCo2S4

    图  2  NiCo2S4的XPS图(a) 全谱图; (b) Ni 2p精细谱; (c) Co 2p 精细谱

    Figure  2.  XPS spectra of NiCo2S4 (a) Full spectrum; (b) The fine spectrum of Ni 2p; (c) The fine spectrum of Co 2p

    图  3  NiCo2S4的SEM、TEM和Mapping测试结果(a) SEM;(b)~(d) TEM;(e)~(h):Mapping

    Figure  3.  SEM, TEM and EDS tested results of NiCo2S4 (a) SEM;(b)~(d) TEM;(e)~(h) Mapping

    图  4  NiCo2S4的N2吸附-脱附测试结果(a) N2吸附等温线;(b) 孔径分布

    Figure  4.  N2 adsorption-desorption tested results of NiCo2S4 (a) N2 adsorption isotherm; (b) pore diameter distribution

    图  5  NiCo2S4的CV测试结果(a) CV曲线;(b) 峰电流

    Figure  5.  CV tested results of NiCo2S4 (a) CV curves; (b) peak current

    图  6  NiCo2S4的GCD结果(a) GCD曲线;(b) 放电效率和比容量;(c) 能量密度

    Figure  6.  GCD results of NiCo2S4 (a) GCD curves; (b) discharge efficiency and specific capacity; (c) energy density

    图  7  NiCo2S4的放电比容量与放电时间的关系图

    Figure  7.  Relationship between specific capacitance and discharge time of NiCo2S4

    图  8  NiCo2S4的EIS结果(a) Nyquist曲线;(b) Bode图

    Figure  8.  EIS results of NiCo2S4 (a) Nyquist curves; (b) Bode diagram

    图  9  NiCo2S4的循环充放电结果

    Figure  9.  Cyclic charging-discharging results of NiCo2S4

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出版历程
  • 收稿日期:  2024-05-07
  • 修回日期:  2024-06-06
  • 录用日期:  2024-06-14
  • 网络出版日期:  2024-06-29

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