{"title":"Crystalline-amorphous double nickel-based composites for high-performance asymmetric supercapacitors to enhance rate performance","authors":"","doi":"10.1016/j.est.2024.114054","DOIUrl":null,"url":null,"abstract":"<div><div>The low rate performance and limited energy density prevent hybrid supercapacitors (HSCs) from being used much further. Herein, a straightforward two-step procedure is used to create the rate-enhanced NiC<sub>2</sub>O<sub>4</sub>/NiCoB composites, which are composed of NiC<sub>2</sub>O<sub>4</sub> nanorods and NiCoB. At the current density of 1 A g<sup>−1</sup>, the NiC<sub>2</sub>O<sub>4</sub>/NiCoB electrode provides a high specific capacitance of 624C g<sup>−1</sup>. The introduction of the NiCoB outer layer significantly enhances the electron transport capability and accelerates the ion/electron transfer rate. This design effectively addresses the inherently poor rate performance of NiC<sub>2</sub>O<sub>4</sub> (with only 32.5 % capacity retention at a high current density of 10 A g<sup>−1</sup>). With the NiCoB outer coating, the capacity retention is remarkably improved to 85.7 % at the current density of 10 A g<sup>−1</sup>. The incorporation of the coating structure fundamentally resolves the issue of poor high-rate performance in the material. Therefore, based on the NiC<sub>2</sub>O<sub>4</sub>/NiCoB as the positive electrode and activated carbon (AC) as the negative electrode, NiC<sub>2</sub>O<sub>4</sub>/NiCoB||AC HSC is assembled. With the maximum potential window of 1.6 <em>V</em>, this HSC exhibits an energy density of 47.4 Wh kg<sup>−1</sup> and a power density of 881.47 W kg<sup>−1</sup>. The innovative design of crystalline-amorphous double nickel-based composites offers an advanced and straightforward approach to enhancing the electron/ion transport kinetics in nickel-based materials, enabling the construction of high-performance HSCs.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9000,"publicationDate":"2024-10-11","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/S2352152X24036405","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
The low rate performance and limited energy density prevent hybrid supercapacitors (HSCs) from being used much further. Herein, a straightforward two-step procedure is used to create the rate-enhanced NiC2O4/NiCoB composites, which are composed of NiC2O4 nanorods and NiCoB. At the current density of 1 A g−1, the NiC2O4/NiCoB electrode provides a high specific capacitance of 624C g−1. The introduction of the NiCoB outer layer significantly enhances the electron transport capability and accelerates the ion/electron transfer rate. This design effectively addresses the inherently poor rate performance of NiC2O4 (with only 32.5 % capacity retention at a high current density of 10 A g−1). With the NiCoB outer coating, the capacity retention is remarkably improved to 85.7 % at the current density of 10 A g−1. The incorporation of the coating structure fundamentally resolves the issue of poor high-rate performance in the material. Therefore, based on the NiC2O4/NiCoB as the positive electrode and activated carbon (AC) as the negative electrode, NiC2O4/NiCoB||AC HSC is assembled. With the maximum potential window of 1.6 V, this HSC exhibits an energy density of 47.4 Wh kg−1 and a power density of 881.47 W kg−1. The innovative design of crystalline-amorphous double nickel-based composites offers an advanced and straightforward approach to enhancing the electron/ion transport kinetics in nickel-based materials, enabling the construction of high-performance HSCs.
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.