{"title":"Manganese(II) oxide-embedded dopamine-derived carbon nanospheres for durable zinc-ion batteries","authors":"Zixiang Zhou, Jianbo Tong, Jiale Guo, Shaofeng Guo, Shuhan Liu, Zhipeng Qin, Zelei Chang, Chao Wang, Shuling Liu","doi":"10.1039/d4qm00505h","DOIUrl":null,"url":null,"abstract":"Manganese oxides are considered highly promising as cathode materials for aqueous zinc-ion batteries (ZIBs) owing to their abundant resources, high discharge potential, and substantial theoretical capacity. Nonetheless, MnO is commonly perceived to exhibit insufficient electrochemical activity and is deemed unsuitable for Zn<small><sup>2+</sup></small> storage. Herein, MnO-embedded PDA-derived carbon (MnO/C-PDA) is utilized as the cathode material for ZIBs, and its electrochemical behavior in ZnSO<small><sub>4</sub></small> electrolytes with varying MnSO<small><sub>4</sub></small> concentrations is investigated. The results indicate that the incorporation of manganese salt electrolyte notably enhances electrode capacity, though excessively high concentrations of manganese salt diminish electrode activity. In the electrolyte containing 0.2 M MnSO<small><sub>4</sub></small>, MnO-C/PDA exhibits a capacity of 295.4 mA h g<small><sup>−1</sup></small> at 0.1 A g<small><sup>−1</sup></small>, with negligible capacity degradation even after 100 cycles. <em>Ex situ</em> characterization reveals that during the charging process, MnO transformed into amorphous MnO<small><sub><em>x</em></sub></small>, accompanied by the deposition of manganese salts forming MnO<small><sub><em>x</em></sub></small>, while the discharge process involved the co-insertion of Zn<small><sup>2+</sup></small> and H<small><sup>+</sup></small>. This work is anticipated to enhance comprehension regarding the charge and discharge mechanisms of MnO, thus aiding in the development of manganese oxide cathodes tailored for ZIBs.","PeriodicalId":86,"journal":{"name":"Materials Chemistry Frontiers","volume":null,"pages":null},"PeriodicalIF":6.0000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Chemistry Frontiers","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1039/d4qm00505h","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Manganese oxides are considered highly promising as cathode materials for aqueous zinc-ion batteries (ZIBs) owing to their abundant resources, high discharge potential, and substantial theoretical capacity. Nonetheless, MnO is commonly perceived to exhibit insufficient electrochemical activity and is deemed unsuitable for Zn2+ storage. Herein, MnO-embedded PDA-derived carbon (MnO/C-PDA) is utilized as the cathode material for ZIBs, and its electrochemical behavior in ZnSO4 electrolytes with varying MnSO4 concentrations is investigated. The results indicate that the incorporation of manganese salt electrolyte notably enhances electrode capacity, though excessively high concentrations of manganese salt diminish electrode activity. In the electrolyte containing 0.2 M MnSO4, MnO-C/PDA exhibits a capacity of 295.4 mA h g−1 at 0.1 A g−1, with negligible capacity degradation even after 100 cycles. Ex situ characterization reveals that during the charging process, MnO transformed into amorphous MnOx, accompanied by the deposition of manganese salts forming MnOx, while the discharge process involved the co-insertion of Zn2+ and H+. This work is anticipated to enhance comprehension regarding the charge and discharge mechanisms of MnO, thus aiding in the development of manganese oxide cathodes tailored for ZIBs.
期刊介绍:
Materials Chemistry Frontiers focuses on the synthesis and chemistry of exciting new materials, and the development of improved fabrication techniques. Characterisation and fundamental studies that are of broad appeal are also welcome.
This is the ideal home for studies of a significant nature that further the development of organic, inorganic, composite and nano-materials.