부산대학교 도서관

Mechanism and synthesis process of MoS 2 SNFs. [Display omitted] • Low-cost and facile process was introduced to prepare very small nano flowers MoS 2 - MoS 2 SNFs. • The morphology, structure and composition of MoS 2 SNFs were studied. • MoS 2 SNFs catalyst was applied to hydrogen evolution reaction. • Tafel slope of 49 mV·dec−1 and an overpotential of −270 mV at −50 mA·cm −2 were shown. • Large active surface 98 m2·g−1 as well as the super stability in acid media was demonstrated. Among various transition metal dichalcogenides, molybdenum disulfides such as molybdenum disulfide nanoflowers (MoS 2 NFs) can effectively catalyze a hydrogen evolution reaction (HER) because of the abundance, ease of processing, and high catalytic activity of MoS 2. The main disadvantage of using MoS 2 NFs for HER on the industrial scale is their low density and number of active sites. Herein, we propose for the first time a facile, inexpensive, and scalable route for fabricating extremely small MoS 2 NFs (SNFs). The size of the synthesized MoS 2 SNFs (50–90 nm) is much lower than that of conventional MoS 2 NFs (900–1500 nm), which significantly increases the number of catalytically active sites. In addition, the in situ doping of N atoms considerably enhances the catalytic activity of the prepared MoS 2 SNFs. MoS 2 SNFs exhibit superior electrocatalytic activity toward HER with a low Tafel slope 49 mV·dec−1, an overpotential of 270 mV at a current density of 50 mA·cm−2, a large surface area of 98 m2·g−1, and very high stability in an acidic environment. The obtained results indicate that MoS 2 SNFs can be potentially used for energy storage and electrochemical applications. [ABSTRACT FROM AUTHOR]