MoSe2 Embedded CNT-Reduced Graphene Oxide Composite Microsphere with Superior Sodium Ion Storage and Electrocatalytic Hydrogen Evolution Performances

• DOI: 10.1021/acsami.7b00147
• Publication Date: 2017-03-06T18:36:46Z
• Authors: Gi Dae Park; Jung Hyun Kim; Seung-Keun Park; Yun Chan Kang
• Keywords: Overpotential; Sulfidation

Highly porous MoSe2-reduced graphene oxide-carbon nanotube (MoSe2-rGO-CNT) powders were prepared by a spray pyrolysis process. The synergistic effect of CNTs and rGO resulted in containing ultrafine MoSe2 nanocrystals with minimal degree stacking. initial discharge capacities MoSe2-rGO-CNT, MoSe2-CNT, MoSe2-rGO, bare for sodium ion storage 501.6, 459.7, 460.2, 364.0 mA h g-1, respectively, at 1.0 A g-1. MoSe2-rGO-CNT composite had superior cycling rate performances compared the MoSe2-rGO composite, powders. electrocatalytic activity hydrogen evolution reaction (HER) was also that MoSe2. exhibited an overpotential 0.24 V current density 10 cm-2, which less than MoSe2-CNT (0.26 cm-2), (0.32 (0.33 cm-2). Tafel slopes 53, 76, 86, 115 mV dec-1, respectively. Because large electrochemical surface area nanocrystals, possesses more active sites extensive stacking crystalline size, provide greater catalytic HER activity.