{"title":"Construction of Cationic Vacancy-Rich Mulberry-Like MnCo2O4.5 Nanostructures with High Surface Area for High-Performance Hybrid Supercapacitors","authors":"Prasad Kumcham, Thupakula Venkata Madhukar Sreekanth*, Kisoo Yoo* and Jonghoon Kim*, ","doi":"10.1021/acsaem.4c0189710.1021/acsaem.4c01897","DOIUrl":null,"url":null,"abstract":"<p >Incorporating cationic vacancies into high surface area mesoporous structured materials is a viable strategy for improving the electrochemical performance of electrochemical energy storage/conversion devices. We successfully developed a mesoporous mulberry-like MnCo<sub>2</sub>O<sub>4.5</sub> (MCO–DMF) with cation metal vacancies via a solvothermal route using dimethylformamide (DMF) as the solvent. The large surface area of the mulberry-like morphology offers numerous electroactive sites and a high permeation of electrolyte ions, giving rise to an excellent electrochemical performance. For comparison, spheres like MnCo<sub>2</sub>O<sub>4.5</sub> (MCO-IPA) were prepared without cationic vacancies using isopropyl alcohol (IPA) as a solvent. The cationic vacancies (Mn) in MCO–DMF were identified by employing various analytical techniques such as energy-dispersive X-ray spectroscopy, scanning and transmission electron microscopy, and X-ray photoelectron spectroscopy. The cation vacancies accelerated the charge transfer kinetics over the electrode–electrolyte interface in MCO–DMF with abundant electroactive sites. In the backdrop of supercapacitor application, the MCO–DMF electrode established a high specific capacity of 628.2 C g<sup>–1</sup> at 0.75 A g<sup>–1</sup> than the MCO-IPA electrode (380.6 C g<sup>–1</sup>) with a greater cycling performance of 95.1% retention at 5 A g<sup>–1</sup> after 10,000 cycles. The MCO–DMF||AC hybrid supercapacitor (HSC) device exhibited a specific capacity of 165.5 C g<sup>–1</sup> at 0.75 A g<sup>–1</sup> within a potential window of 0.0–1.5 V. The HSC device also has a noteworthy energy and power densities of 58.5 Wh kg<sup>–1</sup> and 1026.7 W kg<sup>–1</sup>, respectively, with a remarkable cycle stability of 91.4% capacity retention after 10,000 cycles.</p>","PeriodicalId":4,"journal":{"name":"ACS Applied Energy Materials","volume":"7 24","pages":"11754–11765 11754–11765"},"PeriodicalIF":5.4000,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Energy Materials","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsaem.4c01897","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Incorporating cationic vacancies into high surface area mesoporous structured materials is a viable strategy for improving the electrochemical performance of electrochemical energy storage/conversion devices. We successfully developed a mesoporous mulberry-like MnCo2O4.5 (MCO–DMF) with cation metal vacancies via a solvothermal route using dimethylformamide (DMF) as the solvent. The large surface area of the mulberry-like morphology offers numerous electroactive sites and a high permeation of electrolyte ions, giving rise to an excellent electrochemical performance. For comparison, spheres like MnCo2O4.5 (MCO-IPA) were prepared without cationic vacancies using isopropyl alcohol (IPA) as a solvent. The cationic vacancies (Mn) in MCO–DMF were identified by employing various analytical techniques such as energy-dispersive X-ray spectroscopy, scanning and transmission electron microscopy, and X-ray photoelectron spectroscopy. The cation vacancies accelerated the charge transfer kinetics over the electrode–electrolyte interface in MCO–DMF with abundant electroactive sites. In the backdrop of supercapacitor application, the MCO–DMF electrode established a high specific capacity of 628.2 C g–1 at 0.75 A g–1 than the MCO-IPA electrode (380.6 C g–1) with a greater cycling performance of 95.1% retention at 5 A g–1 after 10,000 cycles. The MCO–DMF||AC hybrid supercapacitor (HSC) device exhibited a specific capacity of 165.5 C g–1 at 0.75 A g–1 within a potential window of 0.0–1.5 V. The HSC device also has a noteworthy energy and power densities of 58.5 Wh kg–1 and 1026.7 W kg–1, respectively, with a remarkable cycle stability of 91.4% capacity retention after 10,000 cycles.
在高表面积介孔结构材料中加入阳离子空位是提高电化学储能/转换装置电化学性能的可行策略。以二甲基甲酰胺(DMF)为溶剂,通过溶剂热途径成功制备了具有阳离子金属空位的桑葚状介孔MnCo2O4.5 (MCO-DMF)。桑葚状形貌的大表面积提供了许多电活性位点和电解质离子的高渗透性,从而产生了优异的电化学性能。为了比较,以异丙醇(IPA)为溶剂,制备了无阳离子空位的MnCo2O4.5 (MCO-IPA)微球。采用能量色散x射线能谱、扫描透射电子显微镜、x射线光电子能谱等多种分析技术对MCO-DMF中的阳离子空位(Mn)进行了鉴定。在电活性位点丰富的MCO-DMF中,阳离子空位加速了电极-电解质界面上的电荷转移动力学。在超级电容器应用的背景下,MCO-DMF电极在0.75 a g-1下的比容量为628.2 C g-1,比MCO-IPA电极(380.6 C g-1)高,在5 a g-1下循环10000次后的保留率为95.1%。MCO-DMF ||交流混合超级电容器(HSC)器件在0.0-1.5 V的电位窗口内,在0.75 a g-1下的比容量为165.5 C g-1。HSC器件的能量和功率密度分别为58.5 Wh kg-1和1026.7 W kg-1,循环稳定性显著,循环10000次后容量保持率为91.4%。
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.