title: MoSe2Embedded CNT-Reduced Graphene Oxide Composite Microsphere with Superior Sodium Ion Storage and Electrocatalytic Hydrogen Evolution Performances.
abstract: 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 powders containing ultrafine MoSe2nanocrystals with a minimal degree of stacking. The initial discharge capacities of MoSe2-rGO-CNT, MoSe2-CNT, MoSe2-rGO, and bare MoSe2powders for sodium ion storage were 501.6, 459.7, 460.2, and 364.0 mA h g-1, respectively, at 1.0 A g-1. The MoSe2-rGO-CNT composite powders had superior cycling and rate performances compared with the MoSe2-CNT, MoSe2-rGO composite, and bare MoSe2powders. The electrocatalytic activity of MoSe2-rGO-CNT in the hydrogen evolution reaction (HER) was also compared with that of MoSe2-CNT, MoSe2-rGO, and bare MoSe2. MoSe2-rGO-CNT composite powders exhibited an overpotential of 0.24 V at a current density of 10 mA cm-2, which was less than that of MoSe2-CNT (0.26 V at 10 mA cm-2), MoSe2-rGO (0.32 V at 10 mA cm-2), and bare MoSe2(0.33 V at 10 mA cm-2). Tafel slopes for the MoSe2-rGO-CNT, MoSe2-CNT, MoSe2-rGO, and bare MoSe2powders were 53, 76, 86, and 115 mV dec-1, respectively. Because a large electrochemical surface area and ultrafine MoSe2nanocrystals, the MoSe2-rGO-CNT composite possesses more active sites than the MoSe2-CNT, MoSe2-rGO composite, and bare MoSe2powders with extensive stacking and large crystalline size, which provide greater catalytic HER activity.
authors.affiliation: Department of Materials Science and Engineering, Korea University , Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
authors.forename: Gi Dae
authors.initials: GD
authors.lastname: Park
authors.affiliation: Department of Materials Science and Engineering, Korea University , Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
authors.forename: Jung Hyun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering, Korea University , Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
authors.forename: Seung-Keun
authors.initials: SK
authors.lastname: Park
authors.affiliation: Department of Materials Science and Engineering, Korea University , Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
authors.forename: Yun Chan
authors.identifier: http://orcid.org/0000-0001-5769-5761
authors.initials: YC
authors.lastname: Kang
keywords: carbon nanotube; hydrogen evolution reaction; molybdenum diselenide; reduced graphene oxide; sodium ion batteries