{"title":"实现高性能不对称超级电容器的 Co3O4/rGO 异质表面重构","authors":"","doi":"10.1016/j.est.2024.114128","DOIUrl":null,"url":null,"abstract":"<div><div>The rational surface reconstruction of component heterointerfaces is an effective strategy for boosting the electrochemical activity and structural stability of asymmetric supercapacitors. In this study, a Co<sub>3</sub>O<sub>4</sub>/rGO (cobalt oxide/reduced graphene oxide(rGO)) heterostructure was designed using a hydrothermal and annealing strategy. Owing to its abundant electroactive sites, accelerated diffusion reaction kinetics, and strong OH<sup>−</sup>adsorption capability, the optimized Co<sub>3</sub>O<sub>4</sub>/rGO composite delivered an ultrahigh capacitance of 273.3 F/g at 1 A/g. Additionally, density functional theory (DFT) calculations verified the significant charge transfer from Co<sub>3</sub>O<sub>4</sub> to rGO near the heterointerface, achieving obvious charge redistribution and the formation of a space-charge layer. This optimization enhances significantly optimizes OH<sup>−</sup> adsorption and diffusion and improves electrical conductivity, leading to the excellent electrochemical performance of the surface-reconstructed Co<sub>3</sub>O<sub>4</sub>/rGO. More importantly, the all-solid-state asymmetric supercapacitor Co<sub>3</sub>O<sub>4</sub>/rGO//AC (activated carbon) demonstrated an exceptional energy density of 16.47 Wh/kg at a power density of 599 W/kg, along with excellent cycling stability, retaining 91.0 % capacitance after 5000 cycles. Overall, this study provides an effective approach for designing surface-reconstructed heterointerfaces to achieve remarkable electrochemical performance and ensure structural integrity, showcasing significant potential for practical applications in the energy storage market.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9000,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Surface reconstruction of Co3O4/rGO heterointerface enabling high-performance asymmetric supercapacitors\",\"authors\":\"\",\"doi\":\"10.1016/j.est.2024.114128\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The rational surface reconstruction of component heterointerfaces is an effective strategy for boosting the electrochemical activity and structural stability of asymmetric supercapacitors. In this study, a Co<sub>3</sub>O<sub>4</sub>/rGO (cobalt oxide/reduced graphene oxide(rGO)) heterostructure was designed using a hydrothermal and annealing strategy. Owing to its abundant electroactive sites, accelerated diffusion reaction kinetics, and strong OH<sup>−</sup>adsorption capability, the optimized Co<sub>3</sub>O<sub>4</sub>/rGO composite delivered an ultrahigh capacitance of 273.3 F/g at 1 A/g. Additionally, density functional theory (DFT) calculations verified the significant charge transfer from Co<sub>3</sub>O<sub>4</sub> to rGO near the heterointerface, achieving obvious charge redistribution and the formation of a space-charge layer. This optimization enhances significantly optimizes OH<sup>−</sup> adsorption and diffusion and improves electrical conductivity, leading to the excellent electrochemical performance of the surface-reconstructed Co<sub>3</sub>O<sub>4</sub>/rGO. More importantly, the all-solid-state asymmetric supercapacitor Co<sub>3</sub>O<sub>4</sub>/rGO//AC (activated carbon) demonstrated an exceptional energy density of 16.47 Wh/kg at a power density of 599 W/kg, along with excellent cycling stability, retaining 91.0 % capacitance after 5000 cycles. Overall, this study provides an effective approach for designing surface-reconstructed heterointerfaces to achieve remarkable electrochemical performance and ensure structural integrity, showcasing significant potential for practical applications in the energy storage market.</div></div>\",\"PeriodicalId\":15942,\"journal\":{\"name\":\"Journal of energy storage\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":8.9000,\"publicationDate\":\"2024-10-14\",\"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/S2352152X24037149\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of energy storage","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352152X24037149","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}
Surface reconstruction of Co3O4/rGO heterointerface enabling high-performance asymmetric supercapacitors
The rational surface reconstruction of component heterointerfaces is an effective strategy for boosting the electrochemical activity and structural stability of asymmetric supercapacitors. In this study, a Co3O4/rGO (cobalt oxide/reduced graphene oxide(rGO)) heterostructure was designed using a hydrothermal and annealing strategy. Owing to its abundant electroactive sites, accelerated diffusion reaction kinetics, and strong OH−adsorption capability, the optimized Co3O4/rGO composite delivered an ultrahigh capacitance of 273.3 F/g at 1 A/g. Additionally, density functional theory (DFT) calculations verified the significant charge transfer from Co3O4 to rGO near the heterointerface, achieving obvious charge redistribution and the formation of a space-charge layer. This optimization enhances significantly optimizes OH− adsorption and diffusion and improves electrical conductivity, leading to the excellent electrochemical performance of the surface-reconstructed Co3O4/rGO. More importantly, the all-solid-state asymmetric supercapacitor Co3O4/rGO//AC (activated carbon) demonstrated an exceptional energy density of 16.47 Wh/kg at a power density of 599 W/kg, along with excellent cycling stability, retaining 91.0 % capacitance after 5000 cycles. Overall, this study provides an effective approach for designing surface-reconstructed heterointerfaces to achieve remarkable electrochemical performance and ensure structural integrity, showcasing significant potential for practical applications in the energy storage market.
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.