Stabilizing V2O3 in carbon nanofiber flexible films for ultrastable potassium storage. Issue 7 (17th February 2022)

• Record Type: Journal Article
• Authors: Yao, Ge; Lin, Minxi; Yang, Jie; Wei, Lingzhi; niu, Helin; Luo, Qiquan; Zheng, Fangcai; Chen, Qianwang
• Is Part Of: Inorganic chemistry frontiers. Volume 9:Issue 7(2022)
• Page Start: 1434
• Page End: 1445
• Publication Date: 2022-02-17
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1qi01611c
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : V2 O3 /CNF flexible films were evaluated as anodes for SIBs, delivering a brilliant sodium storage performance (175 mA h g −1 at 10 A g −1 ; capacity retention of 98% after 2500 cycles at 1 A g −1 ). Abstract : Herein, we designed and synthesized carbon nanofiber flexible films with ultrafine V2 O3 nanocrystals uniformly dispersed in the skeleton of nanofibers (denoted as V2 O3 /CNF). In this structure, the oxygen-bridged (V–O–C) bonds grafted on the inner surface of nanopores in the carbon nanofibers provide abundant exposed electrochemically active sites as well as effectively avoiding the agglomeration of V2 O3 nanocrystals to induce volume expansion. Besides, the flexible carbon matrix with porous interconnected channels facilitates the fast transfer of the K + -containing electrolyte and electrons generated in the electrochemical reactions. V2 O3 /CNF films with unique structural characteristics deliver a good potassium-storage performance with an outstanding cycling stability (retention of 98% after 2500 cycles at 1 A g −1 ) and excellent rate capacity (175 mA h g −1 at 10 A g −1 ), and the DFT results prove the superiority of V–O–C bonds.