Hierarchical Tubular‐Structured MoSe₂ Nanosheets/N‐Doped Carbon Nanocomposite with Enhanced Sodium Storage Properties

Abstract

Intimately coupled carbon/molybdenum‐based hierarchical nanostructures are promising anodes for high‐performance sodium‐ion batteries owing to the combined effects of the two components and their robust structural stability. Mo–polydopamine (PDA) complexes are appealing precursors for the preparation of various Mo‐based nanostructures containing N‐doped carbon (NC). A facile method for the fabrication of hierarchical tubular nanocomposites with intimately coupled MoSe2 and NC nanosheets has been developed, which involves the preparation of Mo–PDA hybrid nanotubes through a chemical route followed by two heat treatments. The strong coupling between Mo anions and the catechol groups in dopamine not only restricts the crystallite size but also inhibits agglomeration during selenization, resulting in few‐layered MoSe2 nanosheets embedded in hierarchical NC substrates. The as‐synthesized nanotube composites are constructed by assembling primary MoSe2/NC nanosheets. This unique structure not only increases the number of active sites but also shortens the diffusion length of ions and enhances the electronic conductivity of electrode materials. The as‐synthesized hierarchical MoSe2/NC nanotubes deliver a high capacity of 429 mAh g−1 at 1 A g−1 after the 150th cycle when used as anodes in sodium‐ion batteries. Furthermore, at a high current density of 10 A g−1, a high discharge capacity of 236 mAh g−1 is achieved.

Harnessing Plasma‐Assisted Doping Engineering to Stabilize Metallic Phase MoSe2for Fast and Durable Sodium‐Ion Storage

“…Moreover, the rate capability for P‐1T‐MoSe 2 NFs is also outperforming most reported carbon‐modified and heteroatom‐doped 1T and 2H phase MoSe 2 materials in SIBs (Figure 3d). [ 3,6,8,10,38–49 ] These results together demonstrate the outstanding rate capability of P‐1T‐MoSe 2 NFs, which could be ascribed to its expanded interlayer spacing, high electronic conductivity, and decreased Na + diffusion barrier, which will be discussed in detail in the following sections.…”

Novel synthesis method of cobalt hydroxycarbonate hydrate‐reduced graphene oxide composite microspheres for lithium‐ion battery anode

“…1,5,16,[21][22][23] Multiple anions TMCs have mainly been synthesized using a liquid solution process. [24][25][26] Spray pyrolysis is suitable for the production of microspheres composited with carbonaceous materials and has been successfully applied to the synthesis of nanostructured TMCs. [27][28][29] However, spray pyrolysis has rarely been applied to the development of TMCs with multiple anions.…”

Co‐MOF derived MoSe 2 @ CoSe 2 /N‐doped carbon nanorods as high‐performance anode materials for potassium ion batteries

“…Two major peaks were verified at binding energies in the range of 392 to 404 eV; the peak located at lower and higher binding energies correspond to Mo 3p 3/2 and N 1s, respectively (Figure 2C). 32 The N 1s spectrum was well‐fitted with three deconvoluted peaks correlated to pyridinic N (398.5 eV), pyrrolic N (399.7 eV), and graphitic N (401.1 eV). The total N content of the hybrid was determined as 5.5 at% by the quantitative XPS analysis.…”