MoSe2 Embedded CNT-Reduced Graphene Oxide Composite Microsphere with Superior Sodium Ion Storage and Electrocatalytic Hydrogen Evolution Performances
- Authors
- Park, Gi Dae; Kim, Jung Hyun; Park, Seung-Keun; Kang, Yun Chan
- Issue Date
- 29-3월-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- sodium ion batteries; hydrogen evolution reaction; molybdenum diselenide; carbon nanotube; reduced graphene oxide
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.9, no.12, pp.10673 - 10683
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 9
- Number
- 12
- Start Page
- 10673
- End Page
- 10683
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84099
- DOI
- 10.1021/acsami.7b00147
- ISSN
- 1944-8244
- 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 MoSe2 nanocrystals with a minimal degree of stacking. The initial discharge capacities of MoSe2-rGO-CNT, MoSe2-CNT, MoSe2-rGO, and bare MoSe2 powders 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 MoSe2 powders. 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 MoSe2 powders were 53, 76, 86, and 115 mV dec(-1), respectively. Because a large electrochemical surface area and ultrafine MoSe2 nanocrystals, the MoSe2-rGO-CNT composite possesses more active sites than the MoSe2-CNT, MoSe2-rGO composite, and bare MoSe2 powders with extensive stacking and large crystalline size, which provide greater catalytic HER activity.
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