Damin Lee , Dong Hwan Kim , Jong Wook Roh , Imanuel Kristanto , Sang Kyu Kwak , Jeongmin Kim
{"title":"Fabrication and electrochemical performance of NiCu carbonate/hydroxide-based electrodes for high-performance supercapacitors","authors":"Damin Lee , Dong Hwan Kim , Jong Wook Roh , Imanuel Kristanto , Sang Kyu Kwak , Jeongmin Kim","doi":"10.1016/j.susmat.2024.e01014","DOIUrl":null,"url":null,"abstract":"<div><p>The increasing usage of high-performance equipment necessitates the exploration of new energy storage solutions. Supercapacitors offer significant advantages over secondary batteries, including longer lifespan, faster charge/discharge rates, higher power density, and greater reliability. Three-dimensional porous NiCu(CO<sub>3</sub>)(OH)<sub>2</sub> nanowires were directly synthesized on Ni foam using a binder-free hydrothermal method as positive electrodes in high-performance supercapacitors. The unique nanowire structure of NiCu(CO<sub>3</sub>)(OH)<sub>2</sub> plays a pivotal role in enhancing electrical performance by providing substantial surface area, improving electrode/electrolyte contact, and shortening ion diffusion paths. The use of Ni- and Cu-based binary transition metal electrodes contributes to high specific capacitance, rapid charge-discharge rates, and excellent cycling stability, collectively resulting in the development of high-capacity supercapacitors. Furthermore, density functional theory calculations were employed to elucidate the electrode formation energy based on the Ni/Cu ratio, assessing the structural stability of electrodes and offering insights for future energy storage device development. The optimized NiCu(CO<sub>3</sub>)(OH)<sub>2</sub> nanowire compound exhibited an outstanding maximum specific capacity of 211.1 mAh g<sup>−1</sup> at 3 A g<sup>−1</sup>. Furthermore, an asymmetric supercapacitor was constructed using the NiCu(CO<sub>3</sub>)(OH)<sub>2</sub> composite as the positive electrode and graphene as the negative electrode. The resulting asymmetric supercapacitors demonstrate a remarkable energy density of 26.7 W h kg<sup>−1</sup> at a power density of 2534 W kg<sup>−1</sup>, along with exceptional cycling stability, retaining 91.3% of its capacity after 5000 cycles. Consequently, the asymmetric supercapacitors incorporating NiCu(CO<sub>3</sub>)(OH)<sub>2</sub> exhibit superior electrical properties compared to most previously reported Ni- and Cu-based asymmetric supercapacitors.</p></div>","PeriodicalId":22097,"journal":{"name":"Sustainable Materials and Technologies","volume":null,"pages":null},"PeriodicalIF":8.6000,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sustainable Materials and Technologies","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214993724001945","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 increasing usage of high-performance equipment necessitates the exploration of new energy storage solutions. Supercapacitors offer significant advantages over secondary batteries, including longer lifespan, faster charge/discharge rates, higher power density, and greater reliability. Three-dimensional porous NiCu(CO3)(OH)2 nanowires were directly synthesized on Ni foam using a binder-free hydrothermal method as positive electrodes in high-performance supercapacitors. The unique nanowire structure of NiCu(CO3)(OH)2 plays a pivotal role in enhancing electrical performance by providing substantial surface area, improving electrode/electrolyte contact, and shortening ion diffusion paths. The use of Ni- and Cu-based binary transition metal electrodes contributes to high specific capacitance, rapid charge-discharge rates, and excellent cycling stability, collectively resulting in the development of high-capacity supercapacitors. Furthermore, density functional theory calculations were employed to elucidate the electrode formation energy based on the Ni/Cu ratio, assessing the structural stability of electrodes and offering insights for future energy storage device development. The optimized NiCu(CO3)(OH)2 nanowire compound exhibited an outstanding maximum specific capacity of 211.1 mAh g−1 at 3 A g−1. Furthermore, an asymmetric supercapacitor was constructed using the NiCu(CO3)(OH)2 composite as the positive electrode and graphene as the negative electrode. The resulting asymmetric supercapacitors demonstrate a remarkable energy density of 26.7 W h kg−1 at a power density of 2534 W kg−1, along with exceptional cycling stability, retaining 91.3% of its capacity after 5000 cycles. Consequently, the asymmetric supercapacitors incorporating NiCu(CO3)(OH)2 exhibit superior electrical properties compared to most previously reported Ni- and Cu-based asymmetric supercapacitors.
期刊介绍:
Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.