{"title":"Manganese and Cobalt Heterostructures in Carbon Aerogels for the Improved Electrochemical Performance of Supercapacitors","authors":"Xiaochan Liu, Tingwei Wang, Xibin Yi, Jing Zhang, Xinfu Zhao, Sijia Liu, Sheng Cui","doi":"10.1021/acsanm.4c01802","DOIUrl":null,"url":null,"abstract":"The structural characteristics of electrodes are very important for supercapacitors (SCs) to improve their performance. Introducing transition metals in carbon aerogels (CAs) is an effective way to boost the application of supercapacitors. We develop a simple method to introduce two kinds of transition metals in a CA in one synthesis step, denoted MnCo/CA. There are small-sized Co nanocrystals and MnO<sub>2</sub> generated in situ, which not only produce abundant heterointerfaces but also enhance the specific surface area of the CA. Thanks to hierarchical porous structures and various MnO<sub>2</sub>/Co/C heterostructure interfaces, the obtained MnCo/CA nanomaterials exhibit an excellent capacitance of 395.9 ± 5.0% F/g under 1.0 A/g, an outstanding rate capacity of 130.8 ± 3.0% F/g under 25.0 A/g, and a superior cycle life of 74.0% after 5000 cycles. Noticeably, benefiting from synergistic effects among metallic cobalt, manganese oxide, and CA, the MnCo/CA//MnCo/CA double-electrode supercapacitor presents a large voltage window (2.5 V) and then reaches a higher energy density of 63.1 ± 1.0% Wh/kg at 312.5 ± 5.0% W/kg. This research emphasizes the synergy effect between metal/metal and metal/carbon in CAs, which offers a simple way for advanced SC electrode materials.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Nano Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acsanm.4c01802","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The structural characteristics of electrodes are very important for supercapacitors (SCs) to improve their performance. Introducing transition metals in carbon aerogels (CAs) is an effective way to boost the application of supercapacitors. We develop a simple method to introduce two kinds of transition metals in a CA in one synthesis step, denoted MnCo/CA. There are small-sized Co nanocrystals and MnO2 generated in situ, which not only produce abundant heterointerfaces but also enhance the specific surface area of the CA. Thanks to hierarchical porous structures and various MnO2/Co/C heterostructure interfaces, the obtained MnCo/CA nanomaterials exhibit an excellent capacitance of 395.9 ± 5.0% F/g under 1.0 A/g, an outstanding rate capacity of 130.8 ± 3.0% F/g under 25.0 A/g, and a superior cycle life of 74.0% after 5000 cycles. Noticeably, benefiting from synergistic effects among metallic cobalt, manganese oxide, and CA, the MnCo/CA//MnCo/CA double-electrode supercapacitor presents a large voltage window (2.5 V) and then reaches a higher energy density of 63.1 ± 1.0% Wh/kg at 312.5 ± 5.0% W/kg. This research emphasizes the synergy effect between metal/metal and metal/carbon in CAs, which offers a simple way for advanced SC electrode materials.
期刊介绍:
ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. 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 applications of nanomaterials.