Ag Nanoparticles decorated few-layer Nb2CTx nanosheets architectures with superior lithium/sodium-ion storage. (10th January 2022)

• Record Type: Journal Article
• Authors: Xiao, Junpeng; Wu, Bingxian; Bai, Lina; Ma, Xinzhi; Lu, Huiqing; Yao, Jing; Zhang, Chi; Gao, Hong
• Is Part Of: Electrochimica acta. Volume 402(2022)
• Publication Date: 2022-01-10
• Subjects: Few-layer Nb2CTxnanosheets -- Ag Nanoparticles decorated -- Lithium-ion storage -- Sodium-ion storage; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.139566
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Nb2 CT x MXene, especially the 2D few-layer Nb2 CT x nanosheets is an electrode material which is potential for lithium/sodium-ion storage. However, it has always been a challenge to prepare the Nb2 CT x nanosheets. Meanwhile, the re-stacking and low conductivity of Nb2 CT x nanosheets inhibit its electrochemical activity. Here, we use a simple method to prepare Nb2 CT x nanosheets with acid etching and ultrasonic processing. And the Nb2 CT x nanosheets modified with Ag nanoparticles are prepared by simple physical mixing and vacuum filtration. The Ag nanoparticles can inhibit the re-stacking of Nb2 CT x nanosheets, thus increasing the specific surface area, besides, it contains abundant free electrons leading to enhancing the conductivity of the electrode, which ensures a large electrochemical active surface area and rapid charge transport of the electrode. In lithium-ion storage, the Ag-Nb2 CT x exhibits a high capacity of 481 mAh g −1 at 0.05 A g −1 after 50 cycles and 187 mAh g −1 at 5.00 A g −1 after 2000 cycles. A capacity of 183 mAh g −1 at 0.05 A g −1 after 50 cycles and 86 mAh g −1 at 5.00 A g −1 after 1000 cycles are obtained for sodium-ion storage. The Ag-Nb2 CT x exhibits superior electrochemical performance, which endows its capability to serve as a superior candidate for electrode material. Graphical abstract: Image, graphical abstract