Edge-Oriented MoS_2 Nanoporous Films as Flexible Electrodes for Hydrogen Evolution Reactions and Supercapacitor Devices

摘要

Molybdenum disulfide (MoS_2), one of the most studied van der Waals solids, possesses unique physical properties when it is in single-layer, few-layer or re-stacked layer forms. These can be fabricated by chemical exfoliation from its layered 3D structure. Recently, edge-oriented MoS_2 nanomaterials were shown to be electrochemically active for fuel production, such as for hydrogen evolution reaction (HER) at the highly exposed edges sites. At the same time, MoS_2 nanomaterials have also been shown to be effective for energy storage in electrochemical capacitors (supercapacitors) due to their large surface area for double-layer charge storage or much higher pseudo-capacitance from the H~+ or Li~+ intercalation into the S-Mo-S stacked layers. Therefore, in view of fuel production (HER) and energy-storage applications (supercapacitors), edge-oriented MoS_2 thin films hold significant promise, provided there are a high degrees of exposed edaes.