Selenium clusters in Zn-glutamate MOF derived nitrogen-doped hierarchically radial-structured microporous carbon for advanced rechargeable Na-Se batteries

Wenda Dong, Hao Chen, Fanjie Xia, Wenbei Yu, Jianping Song, Sijia Wu, Zhao Deng, Zhi Yi Hu, Tawfique Hasan, Yu Li, Hongen Wang, Lihua Chen, Bao Lian Su

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Sodium-selenium (Na-Se) batteries are a promising substitute for traditional Li-ion batteries due to their high theoretical volumetric capacity (∼3260 mA h cm -3 ). However, shuttle effects and large volume changes still limit their practical applications. Herein, we embed Se clusters in nitrogen-doped hierarchically radial-structured microporous carbon (N-HRMC) derived from a zinc-glutamate metal-organic framework (MOF) for advanced sodium storage. In this carbon-based composite, the micropores and the C-Se and C-O-Se bonds in N-HRMC effectively confine the Se clusters and Na 2 Se during the discharge-charge process. The nitrogen doping in N-HRMC strongly enhances the electrical conductivity of Se and chemical adsorption on Na 2 Se. In particular, density functional theory (DFT) calculations demonstrate that pyridinic-N atoms provide much more chemical adsorption of Na 2 Se than graphitic-N and pyrrolic-N atoms. Consequently, the cathode with Se clusters embedded in N-HRMC deliver a capacity of 612 mA h g -1 after 200 cycles at 0.2C, with cycling stability for >500 cycles and a capacity retention of ∼100% from the 20 th cycle at 0.5C, representing one of the best reported results for Na-Se batteries. Our work here suggests that embedding Se clusters in nitrogen-doped hierarchically structured microporous carbon systems presents an attractive strategy to enhance the capacity and rate capability of Na-Se batteries.

langue originaleAnglais
Pages (de - à)22790-22797
Nombre de pages8
journalJournal of Materials Chemistry A
Volume6
Numéro de publication45
Les DOIs
Etat de la publicationPublié - 1 janv. 2018

Empreinte digitale Examiner les sujets de recherche de « Selenium clusters in Zn-glutamate MOF derived nitrogen-doped hierarchically radial-structured microporous carbon for advanced rechargeable Na-Se batteries ». Ensemble, ils forment une empreinte digitale unique.

  • Équipement

  • Contient cette citation