Net-like molybdenum selenide-acetylene black supported on Ni foam for high-performance supercapacitor electrodes and hydrogen evolution reaction

Three-dimensional (3D) transition metal dichalcogenides-based nanostructures composed of nanosheets have recently attracted significant interest for energy storage devices such as supercapacitors and lithium-ion batteries. Herein, a facile hydrothermal strategy is applied to prepare net-like MoSe2-acetylene black (AB), tailoring the interior structure by Ni substrate. The 3D MoSe2-AB nanostructures constructed with MoSe2 ultrathin nanosheets are applied as supercapacitors electrode materials. As expected, the net-like MoSe2-AB composites exhibit a high specific capacitance (2020 F g(-1) at 1 A g(-1)) and good cycling stability (107.5% after 1500 cycles) due to their unique architecture. The MoSe2-AB composites also show highly electrocatalytic ability for hydrogen evolution reaction (0.08 V of onset potential and similar to 55 mV dec(-1) of Tafel slope). The developed method can be extended to the preparation of other MoSe2-based materials and used in other applications, such as sensors, Li-ion battery or oxygen reduction reaction. (C) 2016 Elsevier B.V. All rights reserved.