Mesoporous reduced graphene oxide/WSe2 composite particles for efficient sodium-ion batteries and hydrogen evolution reactions
- Authors
- Cho, Jung Sang; Park, Seung-Keun; Jeon, Kyung Min; Piao, Yuanzhe; Kang, Yun Chan
- Issue Date
- 30-11월-2018
- Publisher
- ELSEVIER
- Keywords
- Tungsten selenide; Sodium ion batteries; Hydrogen evolution; Graphene; Spray pyrolysis
- Citation
- APPLIED SURFACE SCIENCE, v.459, pp.309 - 317
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 459
- Start Page
- 309
- End Page
- 317
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/71488
- DOI
- 10.1016/j.apsusc.2018.07.200
- ISSN
- 0169-4332
- Abstract
- Mesoporous WSe2-reduced graphene oxide (WSe2-rGO) composite particles were prepared by spray pyrolysis and subsequent selenization. The WSe2-rGO composite particles had both well-dispersed rGO nanosheets and well-faceted WSe2 nanocrystals with plenty of folded edges. As a comparison sample, hierarchical structured WSe2 particles were produced by selenization of the bare WO3 particles obtained by spray pyrolysis. The WSe2-rGO composite particles showed superior electrochemical properties for sodium-ion batteries (SIBs) and electrocatalytic efficiencies for hydrogen evolution reactions (HERs) compared to those of the bare WSe2 particles. The discharge capacities of the WSe2-rGO composite particles and bare WSe2 particles for the 100th cycle at a current density of 0.5 A g(-1) for sodium-ion storage were 238 and 36 mA h g(-1), respectively; their corresponding capacity retentions measured from the third cycle were 80% and 13%. The WSe2-rGO composite particles showed much lower onset potential and larger current density (36.5 mA cm(-2) at eta = 300 mV) than those of the bare WSe2 particles (0.61 mA cm(-2) at = 300 mV). The Tafel slopes for the WSe2-rGO composite and bare WSe2 particles were approximately 60 and 115 mV dec(-1), respectively.
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