Mesoporous reduced graphene oxide/WSe 2 composite particles for efficient sodium-ion batteries and hydrogen evolution reactions

Jung Sang Cho, Seung Keun Park, Kyung Min Jeon, Yuanzhe Piao, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Mesoporous WSe 2 -reduced graphene oxide (WSe 2 -rGO) composite particles were prepared by spray pyrolysis and subsequent selenization. The WSe 2 -rGO composite particles had both well-dispersed rGO nanosheets and well-faceted WSe 2 nanocrystals with plenty of folded edges. As a comparison sample, hierarchical structured WSe 2 particles were produced by selenization of the bare WO 3 particles obtained by spray pyrolysis. The WSe 2 -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 WSe 2 particles. The discharge capacities of the WSe 2 -rGO composite particles and bare WSe 2 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 WSe 2 –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 WSe 2 particles (0.61 mA cm −2 at η = 300 mV). The Tafel slopes for the WSe 2 –rGO composite and bare WSe 2 particles were approximately 60 and 115 mV dec −1 , respectively.

Original languageEnglish
Pages (from-to)309-317
Number of pages9
JournalApplied Surface Science
Volume459
DOIs
Publication statusPublished - 2018 Nov 30

Keywords

  • Graphene
  • Hydrogen evolution
  • Sodium ion batteries
  • Spray pyrolysis
  • Tungsten selenide

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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