| 초록 |
MoS2 have been shown to be efficient electrocatalysts for the hydrogen evolution reaction (HER) replacing expensive noble metals. Here, we first describe that when atomic layer deposition (ALD) is applied to layered materials such as MoS2. When MoS2 as a representative 2-D material is deposited on self-supported Cu substrates in a controlled manner, the sulfidation reactions also occur with the metal. We observed the spontaneous formation of a composite chalcogenide materials that consist of two-dimensional (2-D) materials dispersed in bulk, i.e., bulk layered heterojunctions (BLHJs) of Cu-Mo-S that contain MoS2 flakes inside, which are uniformly dispersed in the Cu2S matrix, and their unusual charge transport properties for application in hydrogen evolution reactions (HERs). BLHJ surfaces exhibited the efficient HER performance of approximately 10 mA/cm2 at a potential of as low as -0.1 V versus a reversible hydrogen electrode (RHE). The Tafel slope was approximately 30 to 40 mV/dec. |
