Jun Xu, Junbao Jiang, Shoufu Cao, Suwan Li, Yuanming Ma, Junwei Chen, Yan Zhang, Xiaoqing Lu
{"title":"嵌入在还原氧化石墨烯上的非晶碳插层 MoS2 纳米片可实现出色的高倍率和超长循环钠存储","authors":"Jun Xu, Junbao Jiang, Shoufu Cao, Suwan Li, Yuanming Ma, Junwei Chen, Yan Zhang, Xiaoqing Lu","doi":"10.1002/eom2.12479","DOIUrl":null,"url":null,"abstract":"<p>MoS<sub>2</sub> as a typical layered transition metal dichalcogenide (LTMD) has attracted considerable attention to work as sodium host materials for sodium-ion batteries (SIBs). However, it suffers from low semiconducting behavior and high Na<sup>+</sup> diffusion barriers. Herein, intercalation of N-doped amorphous carbon (NAC) into each interlayer of the tiny MoS<sub>2</sub> nanosheets embedded on rGO conductive network is achieved, resulting in formation of rGO@MoS<sub>2</sub>/NAC hierarchy with interoverlapped MoS<sub>2</sub>/NAC superlattices for high-performance SIBs. Attributed to intercalation of NAC, the resulting MoS<sub>2</sub>/NAC superlattices with wide MoS<sub>2</sub> interlayer of 1.02 nm facilitates rapid Na<sup>+</sup> insertion/extraction and accelerates reaction kinetics. Theoretical calculations uncover that the MoS<sub>2</sub>/NAC superlattices are beneficial for enhanced electron transport, decreased Na<sup>+</sup> diffusion barrier and improved Na<sup>+</sup> adsorption energy. The rGO@MoS<sub>2</sub>/NAC anode presents significantly improved high-rate capabilities of 228, 207, and 166 mAh g<sup>−1</sup> at 20, 30, and 50 A g<sup>−1</sup>, respectively, compared with two control samples of pristine MoS<sub>2</sub> and MoS<sub>2</sub>/NAC counterparts. Excellent long-term cyclability over 10 000 cycles with extremely low capacity decay is demonstrated at high current densities of 20 and 50 A g<sup>−1</sup>. Sodium-ion full cells based on the rGO@MoS<sub>2</sub>/NAC anode are also demonstrated, yielding decent cycling stability of 200 cycles at 5C. Our work provides a novel interlayer strategy to regulate electron/Na<sup>+</sup> transport for fast-charging SIBs.</p><p>\n <figure>\n <div><picture>\n <source></source></picture><p></p>\n </div>\n </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":null,"pages":null},"PeriodicalIF":10.7000,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12479","citationCount":"0","resultStr":"{\"title\":\"Amorphous carbon intercalated MoS2 nanosheets embedded on reduced graphene oxide for excellent high-rate and ultralong cycling sodium storage\",\"authors\":\"Jun Xu, Junbao Jiang, Shoufu Cao, Suwan Li, Yuanming Ma, Junwei Chen, Yan Zhang, Xiaoqing Lu\",\"doi\":\"10.1002/eom2.12479\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>MoS<sub>2</sub> as a typical layered transition metal dichalcogenide (LTMD) has attracted considerable attention to work as sodium host materials for sodium-ion batteries (SIBs). However, it suffers from low semiconducting behavior and high Na<sup>+</sup> diffusion barriers. Herein, intercalation of N-doped amorphous carbon (NAC) into each interlayer of the tiny MoS<sub>2</sub> nanosheets embedded on rGO conductive network is achieved, resulting in formation of rGO@MoS<sub>2</sub>/NAC hierarchy with interoverlapped MoS<sub>2</sub>/NAC superlattices for high-performance SIBs. Attributed to intercalation of NAC, the resulting MoS<sub>2</sub>/NAC superlattices with wide MoS<sub>2</sub> interlayer of 1.02 nm facilitates rapid Na<sup>+</sup> insertion/extraction and accelerates reaction kinetics. Theoretical calculations uncover that the MoS<sub>2</sub>/NAC superlattices are beneficial for enhanced electron transport, decreased Na<sup>+</sup> diffusion barrier and improved Na<sup>+</sup> adsorption energy. The rGO@MoS<sub>2</sub>/NAC anode presents significantly improved high-rate capabilities of 228, 207, and 166 mAh g<sup>−1</sup> at 20, 30, and 50 A g<sup>−1</sup>, respectively, compared with two control samples of pristine MoS<sub>2</sub> and MoS<sub>2</sub>/NAC counterparts. Excellent long-term cyclability over 10 000 cycles with extremely low capacity decay is demonstrated at high current densities of 20 and 50 A g<sup>−1</sup>. Sodium-ion full cells based on the rGO@MoS<sub>2</sub>/NAC anode are also demonstrated, yielding decent cycling stability of 200 cycles at 5C. Our work provides a novel interlayer strategy to regulate electron/Na<sup>+</sup> transport for fast-charging SIBs.</p><p>\\n <figure>\\n <div><picture>\\n <source></source></picture><p></p>\\n </div>\\n </figure></p>\",\"PeriodicalId\":93174,\"journal\":{\"name\":\"EcoMat\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":10.7000,\"publicationDate\":\"2024-07-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12479\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"EcoMat\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/eom2.12479\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"EcoMat","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/eom2.12479","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Amorphous carbon intercalated MoS2 nanosheets embedded on reduced graphene oxide for excellent high-rate and ultralong cycling sodium storage
MoS2 as a typical layered transition metal dichalcogenide (LTMD) has attracted considerable attention to work as sodium host materials for sodium-ion batteries (SIBs). However, it suffers from low semiconducting behavior and high Na+ diffusion barriers. Herein, intercalation of N-doped amorphous carbon (NAC) into each interlayer of the tiny MoS2 nanosheets embedded on rGO conductive network is achieved, resulting in formation of rGO@MoS2/NAC hierarchy with interoverlapped MoS2/NAC superlattices for high-performance SIBs. Attributed to intercalation of NAC, the resulting MoS2/NAC superlattices with wide MoS2 interlayer of 1.02 nm facilitates rapid Na+ insertion/extraction and accelerates reaction kinetics. Theoretical calculations uncover that the MoS2/NAC superlattices are beneficial for enhanced electron transport, decreased Na+ diffusion barrier and improved Na+ adsorption energy. The rGO@MoS2/NAC anode presents significantly improved high-rate capabilities of 228, 207, and 166 mAh g−1 at 20, 30, and 50 A g−1, respectively, compared with two control samples of pristine MoS2 and MoS2/NAC counterparts. Excellent long-term cyclability over 10 000 cycles with extremely low capacity decay is demonstrated at high current densities of 20 and 50 A g−1. Sodium-ion full cells based on the rGO@MoS2/NAC anode are also demonstrated, yielding decent cycling stability of 200 cycles at 5C. Our work provides a novel interlayer strategy to regulate electron/Na+ transport for fast-charging SIBs.