Wu Yung-Fu, Hsiao Yu-Cheng, Liao Chen-Hao, Hsu Chia-Shuo, Yougbaré Sibidou, Lin Lu-Yin
Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
Stanford Byers Center for Biodesign, Stanford University, CA 94305-5428, USA; Graduate Institute of Biomedical Optomechatronics, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan; Cell Physiology and Molecular Image Research Center, Wan Fang Hospital, Taipei Medical University, Taipei 11696, Taiwan; International PhD Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan.
J Colloid Interface Sci. 2022 Dec 15;628(Pt A):540-552. doi: 10.1016/j.jcis.2022.07.154. Epub 2022 Aug 2.
Nickel and cobalt layered double hydroxide (NiCo-LDH) has large specific surface area and interlayer spacing, multiple redox states and high ion-exchange capability, but poor electrical conductivity, severe agglomerations and structural defect restrict energy storage ability of NiCo-LDH as active materiel of battery supercapacitor hybrids (BSH). In this study, it is the first time to design sulfur-doped NiCo-LDH and polypyrrole nanotubes composites (NiCo-LDH-S/PNTs) from zeolitic imidazolate framework-67 (ZIF-67) as the efficient active material of BSH using electrospinning and hydrothermal processes. Effects of sulfur doping amounts are investigated. The one-dimensional hollow polypyrrole decorated with NiCo-LDH-S sheets with high aspect ratio provides straight charge-transfer routes and abundant contacts with electrolyte. The highest specific capacitance (C) of 1936.3 F/g (specific capacity of 322.8 mAh/g) is achieved for the NiCo-LDH-S/PNTs with sulfur doping amount of 7% at 10 mV/s. The BSH comprising graphene LDH negative electrode and NiCo-LDH-S/PNTs positive electrode shows the maximum energy density of 16.28 Wh/kg at 650 W/kg. The C retention of 74% and Coulombic efficiency of 90% are also achieved after 8000 charge/discharge cycles.
镍钴层状双氢氧化物（NiCo-LDH）具有较大的比表面积和层间距、多种氧化还原态以及较高的离子交换能力，但其电导率较差、严重团聚和结构缺陷限制了NiCo-LDH作为电池超级电容器混合体（BSH）活性材料的储能能力。在本研究中，首次采用静电纺丝和水热法，以沸石咪唑酯骨架-67（ZIF-67）为原料设计硫掺杂的NiCo-LDH与聚吡咯纳米管复合材料（NiCo-LDH-S/PNTs）作为BSH的高效活性材料。研究了硫掺杂量的影响。具有高纵横比的NiCo-LDH-S片装饰的一维中空聚吡咯提供了直接的电荷转移路径以及与电解质的丰富接触。硫掺杂量为7%的NiCo-LDH-S/PNTs在10 mV/s时实现了1936.3 F/g的最高比电容（C）（比容量为322.8 mAh/g）。由石墨烯LDH负极和NiCo-LDH-S/PNTs正极组成的BSH在650 W/kg时显示出16.28 Wh/kg的最大能量密度。在8000次充放电循环后，还实现了74%的电容保持率和90%的库仑效率。
