Thermally stable fishnet-like 1T-MoS2/CNT heterostructures with improved electrode performance

1T-MoS2 is the metallic phase of molybdenum disulfide (MoS2), and has obvious advantages in energy storage applications compared with the 2H phase. However, the 1T phase is inherently unstable and can be easily converted to the 2H phase, specifically under thermal annealing. So, the 1T phase can hardly be further modified after synthesis, and there is a hidden danger that high boiling point organic solvents or moisture cannot be removed, which will inevitably affect the performance of the material. In this paper, we described a 3-dimensional fishnet-like 1T-MoS2 heterostructure (3D@1T-MoS2), and revealed that the 1T phase MoS2 in the as-synthesized 3D@1T-MoS2 nanostructure is thermally-stable (even at high-temperature: similar to 700 degrees C). Aided by theoretical calculations and XPS deconvolution spectrum analysis, the phase stability mechanism is revealed to be closely related to the presence of carbon nanotubes and graphite carbon in this structure. Remarkably, after high temperature treatment, this 3D@1T-MoS2-700 electrode delivers a large reversible capacity of 5.25 mA h cm(-2) (similar to 1800 mA h g(-1)) at 0.1 mA cm(-2).

Automated summary

A thermally-stable 3D@1T-MoS2 nanostructure has been discovered, with the 1T phase MoS2 maintaining stability at high temperatures and a phase stability mechanism involving the presence of carbon nanotubes and graphite carbon. The electrode treated at high temperatures exhibited excellent reversible capacity performance.