Investigating the electroactivity of nitrogen species in MoC nanoparticles/N-doped carbon nanosheets for high-performance Na/Li-ion batteries. Issue 40 (12th October 2020)

• Record Type: Journal Article
• Authors: Wu, Qing; Li, Xiaofeng; Wang, Xianjie; Yao, Tai; Bai, Ying; Jian, Jikang; Song, Bo
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 40(2020)
• Page Start: 21298
• Page End: 21305
• Publication Date: 2020-10-12
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta08301a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Various MoC/nitrogen (N)-doped carbon nanosheet hybrid materials (MoC@NCs) have been synthesized, and the effects of various N dopants [graphitic N (G6-N), pyrrolic N (P5-N), pyridinic N (P6-N), and Mo–N] on the electrochemical properties were systematically investigated. Abstract : Various MoC/nitrogen (N)-doped carbon nanosheet hybrid materials (MoC@NCs) have been synthesized, and the effects of various N dopants [graphitic N (G6-N), pyrrolic N (P5-N), pyridinic N (P6-N), and Mo–N] on the electrochemical properties were systematically investigated. With increasing N-doping of MoC@NCs, the electronic conductivity increases. The formation of Mo–N bonds improves the electrochemical stability of MoC@NCs by pinning MoC nanoparticles (NPs) on carbon nanosheets, while the defective species (P5–N and P6–N) are of benefit for ion storage. Thus, MoC@NC-1.0 displays the best cycling stability and rate capability for both sodium-ion batteries (SIBs) (98% capacity retention after 1000 cycles at 1.0 A g −1 ) and lithium-ion batteries (LIBs) (762 mA h g −1 at 1.0 A g −1 ). This work not only presents an in-depth understanding of how various N dopants can enhance the electrochemical properties of MoC@NC electrodes but also offers new avenues to develop novel electrode materials for alkaline-ion batteries.