{"title":"In-situ growth of series-connected CoNi2S4 hollow nanocages strung by carbon nanotubes for high-performance hybrid supercapacitors","authors":"Xinbiao Mao , Hongtao Guan , Jufeng Zhou, Wenwen Zhou, Xiaobei Shi, Xin Xu, Yunfang Gao","doi":"10.1016/j.est.2024.114751","DOIUrl":null,"url":null,"abstract":"<div><div>For supercapacitors (SCs), there is an urgent need to develop positive materials with excellent electrochemical performance. In this work, in-situ growth of series-connected CoNi<sub>2</sub>S<sub>4</sub> hollow nanocages derived from zeolitic imidazolate framework-67 (ZIF-67) and strung by carboxylated carbon nanotubes (C-CNTs) were successfully synthesized through a two-step ordered ion etching/exchange procedure. The special connection structure and synergistic effect between CoNi<sub>2</sub>S<sub>4</sub> nanocages and C-CNTs greatly improve the electrochemical performance of the hybrid (CoNi<sub>2</sub>S<sub>4</sub>/C-CNTs), in which porous CoNi<sub>2</sub>S<sub>4</sub> hollow nanocages offer electrochemical active sites and fast ion diffusion channels, while C-CNTs provide electron transport paths. The optimized hybrid, CoNi<sub>2</sub>S<sub>4</sub>/C-CNTs20, exhibits excellent electrochemical performance with a high specific capacity (1314.6C g<sup>−1</sup> at 1 A g<sup>−1</sup>) and an impressive rate capability (72.1 % retention at 20 A g<sup>−1</sup>). Furthermore, the hybrid supercapacitor (HSC) using CoNi<sub>2</sub>S<sub>4</sub>/C-CNTs20 and active rice husk carbon (ARHC) as the positive and negative electrodes, respectively, demonstrates an outstanding energy density of 47.9 Wh kg<sup>−1</sup> at a power density of 800 W kg<sup>−1</sup> and remarkable cycling stability of 90 % at 5 A g<sup>−1</sup> after 8500 cycles. Our work will open up a brand-new strategy to oriented design electrode materials for various energy storage devices.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"105 ","pages":"Article 114751"},"PeriodicalIF":8.9000,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of energy storage","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352152X24043378","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
For supercapacitors (SCs), there is an urgent need to develop positive materials with excellent electrochemical performance. In this work, in-situ growth of series-connected CoNi2S4 hollow nanocages derived from zeolitic imidazolate framework-67 (ZIF-67) and strung by carboxylated carbon nanotubes (C-CNTs) were successfully synthesized through a two-step ordered ion etching/exchange procedure. The special connection structure and synergistic effect between CoNi2S4 nanocages and C-CNTs greatly improve the electrochemical performance of the hybrid (CoNi2S4/C-CNTs), in which porous CoNi2S4 hollow nanocages offer electrochemical active sites and fast ion diffusion channels, while C-CNTs provide electron transport paths. The optimized hybrid, CoNi2S4/C-CNTs20, exhibits excellent electrochemical performance with a high specific capacity (1314.6C g−1 at 1 A g−1) and an impressive rate capability (72.1 % retention at 20 A g−1). Furthermore, the hybrid supercapacitor (HSC) using CoNi2S4/C-CNTs20 and active rice husk carbon (ARHC) as the positive and negative electrodes, respectively, demonstrates an outstanding energy density of 47.9 Wh kg−1 at a power density of 800 W kg−1 and remarkable cycling stability of 90 % at 5 A g−1 after 8500 cycles. Our work will open up a brand-new strategy to oriented design electrode materials for various energy storage devices.
对于超级电容器来说,迫切需要开发具有优异电化学性能的正极材料。在这项工作中,通过两步有序离子蚀刻/交换过程,成功地原位生长了由沸石基吡唑酸骨架-67 (ZIF-67)和羧化碳纳米管(C-CNTs)串联的串联CoNi2S4空心纳米笼。CoNi2S4纳米笼与C-CNTs之间特殊的连接结构和协同效应极大地提高了CoNi2S4/C-CNTs复合材料的电化学性能,其中多孔CoNi2S4中空纳米笼提供了电化学活性位点和快速离子扩散通道,而C-CNTs提供了电子传递途径。优化后的混合物CoNi2S4/C-CNTs20具有优异的电化学性能,在1 a g−1条件下具有较高的比容量(1314.6C g−1)和较高的倍率(20 a g−1条件下保持率为72.1%)。此外,以CoNi2S4/C-CNTs20和活性稻壳碳(ARHC)为正极和负极的混合超级电容器(HSC)在功率密度为800 W kg - 1时的能量密度为47.9 Wh kg - 1,在5 a g - 1下循环8500次后的稳定性为90%。我们的工作将为各种储能装置电极材料的定向设计开辟一条全新的策略。
期刊介绍:
Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.