Supercritical CO2‐Assisted Reverse‐Micelle‐Induced Solution‐Phase Fabrication of Two‐Dimensional Metallic 1T‐MoS2 and 1T‐WS2

Abstract Metallic 1T phase molybdenum disulfide (MoS 2 ) and tungsten disulfide (WS 2 ) are both expected to exhibit promising catalytic activity, but they are highly unstable in nature. Exploring an efficient route to fabricate a high ratio of 1T‐MoS 2 and 1T‐WS 2 is highly desirable. Herein, for the first time, we report a two‐step process for synthesizing stable two‐dimensional (2D) metallic 1T phase MS 2 nanosheets in the reverse‐micelle‐induced emulsion microenvironment with the assistance of supercritical CO 2 (SC CO 2 ). TEM, Raman and XPS characterizations demonstrate that the as‐prepared MoS 2 nanosheets consist of 1T‐ and 2H‐phase, and the content of 1T phase is more than 90 %. The obtained 1T‐MoS 2 exhibits excellent stability and good activity for the hydrogen evolution reaction. A potential of ≈330 mV at a current density of 10 mA cm −2 and a Tafel slope of 70 mV per decade were obtained for 1T‐MoS 2 . TEM and UV/Vis spectrum characterizations also testify that we have obtained 1T‐WS 2 . Thus this strategy utilizing a reverse‐micelle‐induced method for fabrication of 2D 1T‐MS 2 can widen the potential applications in photoelectrocatalysis and photoelectronic devices.