Luo Kaicheng, Zhang Junjun, Chu Wei, Chen Hui
College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China.
School of Chemical Engineering, Sichuan University, Chengdu, Sichuan 610065, China.
ACS Omega. 2020 Sep 14;5(38):24693-24699. doi: 10.1021/acsomega.0c03283. eCollection 2020 Sep 29.
The electrode, as one of the key components in supercapacitors, has a pivotal effect on the overall performances. In this work, a series of composite electrode materials are proposed via the combination of nickel aluminum layered double hydroxides (NiAl-LDHs) and carbon nanotubes (CNTs). To begin with, materials with different ratios of the two compositions are fabricated with a coprecipitation method. After that, various characterization methods indicate that the NiAl-LDH/CNT composites exhibit an irregular thin platelet structure with a well-constructed conductive network inside. Furthermore, the effect of the CNT ratio on the electrochemical property is subsequently investigated, which proves that the conductive network of CNTs is beneficial for the transport of the electrons and strengthens the platelet structure. The results show that when the amount of CNTs reaches 1.5 wt %, it can yield a high specific capacitance of 2447 F g at 2 A g, with a good cycling stability of 90.1% after 2500 cycles, indicating high application potential in positive electrodes of pseudocapacitors. The synergistic effects of NiAl-LDHs and CNTs are thought to be the main reasons for the good properties of NiAl-LDHs/CNTs composites.
电极作为超级电容器的关键部件之一，对整体性能有着至关重要的影响。在本工作中，通过镍铝层状双氢氧化物（NiAl-LDHs）与碳纳米管（CNTs）相结合的方式制备了一系列复合电极材料。首先，采用共沉淀法制备了两种成分比例不同的材料。之后，各种表征方法表明，NiAl-LDH/CNT复合材料呈现出不规则的薄片状结构，内部具有良好构建的导电网络。此外，随后研究了CNT比例对电化学性能的影响，结果证明CNTs的导电网络有利于电子传输并强化了片状结构。结果表明，当CNTs的含量达到1.5 wt%时，在2 A g电流密度下可获得2447 F g的高比电容，经过2500次循环后具有90.1%的良好循环稳定性，表明其在赝电容器正极中具有较高的应用潜力。NiAl-LDHs和CNTs的协同效应被认为是NiAl-LDHs/CNTs复合材料具有良好性能的主要原因。
