{"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.
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.