Phase‐Controllable Synthesis of Multifunctional 1T‐MoSe₂ Nanostructures: Applications in Lithium‐Ion Batteries, Electrocatalytic Hydrogen Evolution, and the Hydrogenation Reaction

Abstract

As an important regulatory method, the phase engineering strategy is widely used to develop functional materials with desired properties. Herein, we combine a solvothermal method with post-annealing treatment to controllably synthesize multifunctional MoSe 2 flower-like nanostructures (FNSs) in different crystal phases. Based on the different phases of MoSe 2 FNSs, we systematically investigate their performance in lithium-ion storage, the hydrogen evolution reaction (HER), and the hydrogenation of nitrophenol. The results show that 1T-MoSe 2 FNSs possess superior performance in lithium-ion batteries, HER, and hydrogenation of PNP compared with 2H-MoSe 2 FNSs. Moreover, density functional theory calculations reveal that 1T-MoSe 2 FNSs exhibits a higher chemisorption energy than that of 2H-MoSe 2 FNSs, which is beneficial for the improvement of the lithium-ion storage capacity. This work provides an effective way to develop functional materials based on phase engineering.

Recent advances in molybdenum diselenide-based electrocatalysts: preparation and application in the hydrogen evolution reaction

“…The resultant 1T-MoSe 2 showed a high HER performance with an overpotential of 206 mV, Tafel slope of 130 mV dec −1 , and C dl of 23.7 mF cm −2 , compared to those of 2H-MoSe 2 nanoflowers (239 mV, 223 mV dec −1 , 6.9 mF cm −2 ), clearly corroborating the high activity of 1T-MoSe 2 with a metallic feature. 200 In addition, the introduction of metal ion into MoSe 2 can also modulate the phase structure, such as 1T/2H-Ru-MoSe 2 , 120 1T′/2H-W x Mo 1− x Se 2 , 98 and Cr 3+ -induced phase transformation of 2H-MoSe 2 into 1T MoSe 2 . 201 Heteroatom doping can generate abundant active sites by constructing interfacial engineering or changing the phase structure to improve the HER performance.…”

“…), and composition (heteroatom doping, etc .). For single MoSe 2 , an excellent HER performance mainly relies on 1T phase content, 200 morphology-induced piezo-flexoelectric coupling effect, 92 defects or vacancies, and more exposed Se active sites, 88,96 as well as synergistic effect (active site and 2H phase). 202 For N, B, S, P-doped MoSe 2 , 45 more exposed active sites, composition alteration, formed vacancies, and heteroatom-induced phase transformation of 2H-MoSe 2 into 1T or 1T′-/2H-MoSe 2 139 as well as the synergistic effect of heteroatom doping and 1T/2H phase 102 are used to explain the HER activity of catalysts and elucidate the structure-performance correlation.…”

Engineering Phase Transition from 2H to 1T in MoSe2 by W Cluster Doping toward Lithium-Ion Battery

“…Since most of the reports have relied on the intercalation of guest ions into the interlayer by the thermosolvent method, the synthesized metal-phase MoSe 2 cannot achieve a stable existence at a high temperature. The transition from the 1T phase to the 2H phase will occur under a certain temperature annealing, resulting in performance attenuation. − Therefore, it is difficult and challenging to explore the synthesis of a high-temperature-stable metallic phase MoSe 2 .…”