Ao Xu, Yan Liu, Jiahui Wang, Yijing Wang, Fuyi Jiang, Yanli Zhou
{"title":"作为高容量阴极材料的高缺陷和导电铜掺杂 1T/2H-MoS2 纳米片,用于增强镁离子储存功能","authors":"Ao Xu, Yan Liu, Jiahui Wang, Yijing Wang, Fuyi Jiang, Yanli Zhou","doi":"10.1039/d4qi02064b","DOIUrl":null,"url":null,"abstract":"Limited by the poor electronic conductivity and strong interaction between Mg2+ and MoS2, the 2H phase of MoS2 as the cathode materials exhibits a low capacity along with poor rate capability. How to adopt the structure engineering to largely boost the Mg2+ diffusion kinetics and enhance the reaction activity are the current tasks that need to be addressed. Herein, the cation doping strategy is adopted to elaborately design the defective Cu-doped metallic MoS2 nanosheets (Cu-MoS2) via a hydrothermal process. The Cu2+ doping widens the layer distance, induces the formation of metallic 1T phase of MoS2, and ameliorates the structural stability. Thus, the Mg2+ ions diffusion kinetics and the electronic conductivity of Cu-MoS2 are largely boosted. Meanwhile, the MgCl+ in the electrolyte can decrease the reaction energy barrier, and therefore fasten the electrochemical reaction. Therefore, the optimized Cu-MoS2 as the cathode materials toward magnesium ion batteries exerts remarkable magnesium storage properties, evidently superior to the pure MoS2. When cycled at 0.1 A g-1 over 100 cycles, the discharge capacity can reach as high as 369.5 mAh g-1. Even cycled at a high rate of 1 A g-1, the Cu-MoS2 maintains a specific capacity of 267.3 mAh g-1 over 200 long cycles. The related kinetics tests confirm its rapid reaction kinetics and pseudocapacitance dominated charge storage process. The ex-situ XPS and HRTEM data largely verify the conversion reaction mechanism of Cu-MoS2 during cycling. This work provides guidelines for the long-term development of MoS2 in the field of magnesium ion batteries.","PeriodicalId":79,"journal":{"name":"Inorganic Chemistry Frontiers","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Highly defective and conductive Cu-doped 1T/2H-MoS2 nanosheets as high-capacity cathode materials toward enhanced magnesium ion storage\",\"authors\":\"Ao Xu, Yan Liu, Jiahui Wang, Yijing Wang, Fuyi Jiang, Yanli Zhou\",\"doi\":\"10.1039/d4qi02064b\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Limited by the poor electronic conductivity and strong interaction between Mg2+ and MoS2, the 2H phase of MoS2 as the cathode materials exhibits a low capacity along with poor rate capability. How to adopt the structure engineering to largely boost the Mg2+ diffusion kinetics and enhance the reaction activity are the current tasks that need to be addressed. Herein, the cation doping strategy is adopted to elaborately design the defective Cu-doped metallic MoS2 nanosheets (Cu-MoS2) via a hydrothermal process. The Cu2+ doping widens the layer distance, induces the formation of metallic 1T phase of MoS2, and ameliorates the structural stability. Thus, the Mg2+ ions diffusion kinetics and the electronic conductivity of Cu-MoS2 are largely boosted. Meanwhile, the MgCl+ in the electrolyte can decrease the reaction energy barrier, and therefore fasten the electrochemical reaction. Therefore, the optimized Cu-MoS2 as the cathode materials toward magnesium ion batteries exerts remarkable magnesium storage properties, evidently superior to the pure MoS2. When cycled at 0.1 A g-1 over 100 cycles, the discharge capacity can reach as high as 369.5 mAh g-1. Even cycled at a high rate of 1 A g-1, the Cu-MoS2 maintains a specific capacity of 267.3 mAh g-1 over 200 long cycles. The related kinetics tests confirm its rapid reaction kinetics and pseudocapacitance dominated charge storage process. The ex-situ XPS and HRTEM data largely verify the conversion reaction mechanism of Cu-MoS2 during cycling. This work provides guidelines for the long-term development of MoS2 in the field of magnesium ion batteries.\",\"PeriodicalId\":79,\"journal\":{\"name\":\"Inorganic Chemistry Frontiers\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.1000,\"publicationDate\":\"2024-10-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Inorganic Chemistry Frontiers\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1039/d4qi02064b\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Chemistry Frontiers","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1039/d4qi02064b","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
Highly defective and conductive Cu-doped 1T/2H-MoS2 nanosheets as high-capacity cathode materials toward enhanced magnesium ion storage
Limited by the poor electronic conductivity and strong interaction between Mg2+ and MoS2, the 2H phase of MoS2 as the cathode materials exhibits a low capacity along with poor rate capability. How to adopt the structure engineering to largely boost the Mg2+ diffusion kinetics and enhance the reaction activity are the current tasks that need to be addressed. Herein, the cation doping strategy is adopted to elaborately design the defective Cu-doped metallic MoS2 nanosheets (Cu-MoS2) via a hydrothermal process. The Cu2+ doping widens the layer distance, induces the formation of metallic 1T phase of MoS2, and ameliorates the structural stability. Thus, the Mg2+ ions diffusion kinetics and the electronic conductivity of Cu-MoS2 are largely boosted. Meanwhile, the MgCl+ in the electrolyte can decrease the reaction energy barrier, and therefore fasten the electrochemical reaction. Therefore, the optimized Cu-MoS2 as the cathode materials toward magnesium ion batteries exerts remarkable magnesium storage properties, evidently superior to the pure MoS2. When cycled at 0.1 A g-1 over 100 cycles, the discharge capacity can reach as high as 369.5 mAh g-1. Even cycled at a high rate of 1 A g-1, the Cu-MoS2 maintains a specific capacity of 267.3 mAh g-1 over 200 long cycles. The related kinetics tests confirm its rapid reaction kinetics and pseudocapacitance dominated charge storage process. The ex-situ XPS and HRTEM data largely verify the conversion reaction mechanism of Cu-MoS2 during cycling. This work provides guidelines for the long-term development of MoS2 in the field of magnesium ion batteries.