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 η = 300 mV) than those of the bare WSe2 particles (0.61 mA cm−2 at η = 300 mV). The Tafel slopes for the WSe2–rGO composite and bare WSe2 particles were approximately 60 and 115 mV dec−1, respectively.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.