Construction of 1T‐MoSe₂/TiC@C Branch–Core Arrays as Advanced Anodes for Enhanced Sodium Ion Storage

Abstract

The use of active sites and reaction kinetics of MoSe2 anodes for sodium ion batteries (SIBs) are highly related to the phase components (1T and 2H phases) and electrode architecture. This study concerns the design and fabrication of wrinkled 1T‐MoSe2 nanoflakes anchored on highly conductive TiC@C nanorods to form 1T‐MoSe2/TiC@C branch–core arrays by a powerful chemical vapor deposition (CVD)–solvothermal method. The 1T‐MoSe2 branch can be easily transformed into its 2H‐MoSe2 counterpart after a facile annealing process. In comparison to 2H‐MoSe2, 1T‐MoSe2 has larger interlayer spacing and higher electronic conductivity, which are beneficial for the acceleration of reaction kinetics and capacity improvement. In addition, direct growth of 1T‐MoSe2 nanoflakes on the TiC@C skeleton not only enhance the electrical conductivity, but also contribute to reinforced structural stability. Accordingly, 1T‐MoSe2/TiC@C branch–core arrays are demonstrated with higher capacity and better rate performance (184 mAh g−1 at 10 A g−1) and impressive durability over 500 cycles with a capacity retention of approximately 91.8 %. This phase modulation plus branch–core design provides a general method for the synthesis of other high‐performance electrode materials for application in electrochemical energy storage.

Topological Insulator‐Assisted MoSe2/Bi2Se3 Heterostructure: Achieving Fast Reaction Kinetics Toward High Rate Sodium‐Ion Batteries

“…Thirdly, the Bi 2 Se 3 substrate provided superior surface electron transfer capability and donated alloying reaction to achieve high Na ions storage capacity upon cycling [45] . Fourthly, the broad interlayer spacing of MoSe 2 could accommodate the Na ions fast insertion/extraction processes [12] …”

“…In general, TMDs have a large interlayer space to accommodate the Na ions insertion/ extraction and provide high additional capacity by participating in conversion reaction and alloying reaction, resulting in more attractive Na storage performance than carbonaceous materials. MoSe 2 , a classic two dimensional (2D) materials, is a promising material for SIBs due to the huge interlayer spacing (0.62 nm) and considerable theoretical capacity (422 mA h g −1 , based on 4 mol Li uptake into MoSe 2 per formula unit) [11,12] . Additionally, it has reported that MoSe 2 has better electronic conductivity than MoS 2 (1.557 eV for MoSe 2 vs. 1.856 eV for MoS 2 ), demonstrating the great potential of 2D MoSe 2 as SIB's anode [13] .…”

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

“…[ 11–15 ] Unlike semiconducting 2H‐MoSe 2 , 1T‐MoSe 2 exhibits metallic property with significantly enhanced electronic conductivity that brings about fast charge‐transfer kinetics. [ 16,17 ] Additionally, its octahedral structure featuring expanded interlayer spacing is more conducive to promoting Na + diffusion kinetics via lowing the diffusion energy barriers. [ 4 ] Furthermore, 1T phases are proved to have a better aptitude for inhibiting anion dissolution during conversion electrochemical reaction owing to their higher bond energies than 2H phases.…”

Anchoring SnS2 on TiC/C Backbone to Promote Sodium Ion Storage by Phosphate Ion Doping

“…Ren et al [28] employed ultralight reduced graphene fiber fabrics as the skeleton to support SnS 2 nanosheets, forming binder-free composite electrodes of SIBs with improved electrochemical performance. In recent years, chemical vapor deposition (CVD)derived titanium carbide/carbon (TiC/C) nanowire arrays have been demonstrated as the ideal 3D conductive matrix for Li, [29] MnO 2 , [30] Ti 2 Nb 10 O 29, [31] and MoSe 2 [32] because of its unique properties such as high electrical conductivity, good mechanical strength, and outstanding resistance to chemical attack. Up to now, the research on combining TiC/C arrays with SnS 2 nanostructure has not been reported and its electrochemical performance as anode of SIBs is worthy of digging.…”