Zhao Yan, Wang Yaqing, Huang Yunpeng, Liu Wenjie, Hu Jinzhi, Zheng Jihua, Wu Limin
College of Energy Material and Chemistry, College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, PR China; Institute for Energy Research, Jiangsu University, Key Laboratory of Zhenjiang, Zhenjiang 212013, PR China.
Institute for Energy Research, Jiangsu University, Key Laboratory of Zhenjiang, Zhenjiang 212013, PR China.
J Colloid Interface Sci. 2023 Jan 15;630(Pt B):444-451. doi: 10.1016/j.jcis.2022.10.128. Epub 2022 Oct 30.
Designing novel efficient electrode materials with controlled hierarchical structure and composition for advanced supercapacitors remains a great challenge. Herein, a core-triple-shelled hierarchical GCNF/PANI/NCO nanostructure has been designed and fabricated by sequential growth of the conductive polyaniline (PANI) layers and nickel carbonate hydroxide (Ni(CO)(OH)) nanosheets on the graphene-coated electrospun carbon nanofibers (GCNF) via a facile wet-chemical strategy. Taking full advantage of the free-standing architecture of graphene-coated electrospun carbon nanofibers, high conductivity and flexibility of the PANI layers, and abundant active sites of Ni(CO)(OH) nanosheets, the optimal GCNF/PANI/NCO (2 h) electrode exhibits a high specific capacitance of 1565F g at 1 A/g and enhanced rate capability, which are higher than those of the GCNF, GCNF/PANI, and GCNF/NCO (2 h) electrodes at the same situation, and also exceeds most of the reported nickel carbonate hydroxide-based electrodes in literature. The superior performance should be mainly ascribed to the collaborative contribution of each component. Moreover, a self-assembled GCNF/PANI/NCO//AC hybrid supercapacitor delivers a high energy density of 35.4 Wh kg@750 W kg and a long cycle lifespan. This strategy enables the controllable synthesis of core-triple-shelled hierarchical materials applicable to advanced electrochemical applications.
设计具有可控分级结构和组成的新型高效电极材料用于先进超级电容器仍然是一项巨大挑战。在此，通过简便的湿化学策略，在石墨烯包覆的电纺碳纳米纤维（GCNF）上依次生长导电聚苯胺（PANI）层和碱式碳酸镍（Ni(CO)(OH)）纳米片，设计并制备了一种核-三壳层分级GCNF/PANI/NCO纳米结构。充分利用石墨烯包覆的电纺碳纳米纤维的自支撑结构、PANI层的高导电性和柔韧性以及Ni(CO)(OH)纳米片丰富的活性位点，最优的GCNF/PANI/NCO（2小时）电极在1 A/g电流密度下展现出1565 F/g的高比电容以及增强的倍率性能，在相同条件下高于GCNF、GCNF/PANI和GCNF/NCO（2小时）电极，并且也超过了文献中报道的大多数碱式碳酸镍基电极。优异的性能应主要归因于各组分的协同贡献。此外，自组装的GCNF/PANI/NCO//AC混合超级电容器提供了35.4 Wh kg@750 W kg的高能量密度和长循环寿命。该策略实现了适用于先进电化学应用的核-三壳层分级材料的可控合成。
