School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China.
Institute of Carbon Neutrality, Zhejiang Wanli University, Ningbo 315100, China.
Molecules. 2022 Nov 23;27(23):8168. doi: 10.3390/molecules27238168.
High-energy density supercapacitors have attracted extensive attention due to their electrode structure design. A synergistic effect related to core-shell structure can improve the energy storage capacity and power density of electrode materials. The Ni-foam (NF) substrate coupled with polypyrrole (PPy) conductive coating can serve as an internal/external bicontinuous conductive network. In this work, the distinctive PPy@FeNiS@NF and PPy@NiCoS@NF materials were prepared by a simple two-step hydrothermal synthesis with a subsequent in situ polymerization method. PPy@FeNiS@NF and PPy@NiCoS@NF could deliver ultrahigh specific capacitances of 3870.3 and 5771.4 F·g at 1 A·g and marvelous cycling capability performances of 81.39% and 93.02% after 5000 cycles. The asymmetric supercapacitors composed of the prepared materials provided a high-energy density of over 47.2 Wh·kg at 699.9 W·kg power density and 67.11 Wh·kg at 800 W·kg power density. Therefore, the self-assembled core-shell structure can effectively improve the electrochemical performance and will have an effective service in advanced energy-storage devices.
高能量密度超级电容器因其电极结构设计而受到广泛关注。核壳结构的协同效应可以提高电极材料的储能容量和功率密度。镍泡沫（NF）基底与导电聚吡咯（PPy）涂层相结合，可以作为内部/外部双连续导电网络。在这项工作中，通过简单的两步水热合成和随后的原位聚合方法制备了独特的 PPy@FeNiS@NF 和 PPy@NiCoS@NF 材料。PPy@FeNiS@NF 和 PPy@NiCoS@NF 在 1 A·g 下可提供超高质量比电容 3870.3 和 5771.4 F·g，在 5000 次循环后具有出色的循环性能，容量保持率为 81.39%和 93.02%。由所制备的材料组成的非对称超级电容器在 699.9 W·kg 功率密度下提供超过 47.2 Wh·kg 的高能量密度，在 800 W·kg 功率密度下提供 67.11 Wh·kg 的能量密度。因此，自组装核壳结构可以有效提高电化学性能，在先进储能设备中具有有效的应用前景。
