N-doped C-CoS2@CoS2/MoS2 nano polyhedrons with hierarchical yolk-shelled structures as bifunctional catalysts for enhanced photovoltaics and hydrogen evolution

Jiahui Yang, Chao Zhang, Yudi Niu, Jie Huang, Xing Qian, Kwok Yin Wong (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

The multicomponent composite nanomaterials with multilevel spatial structures have a broad application prospect in energy conversion. Herein, we rationally designed a novel strategy to synthesize hierarchical yolk-shelled N-doped carbon/CoS2/MoS2 nano polyhedrons (NC-CoS2@CoS2/MoS2 YSPs) as bifunctional catalysts for dye-sensitized solar cells (DSSCs) and hydrogen evolution reactions (HERs). NC-CoS2@CoS2/MoS2 YSPs were prepared by ion-exchange between zeolitic imidazolate framework-67 (ZIF-67) and (NH4)2MoS4 with a subsequent sulfuration reaction under an annealing treatment. Benefiting from the unique yolk-shelled architecture, the obtained NC-CoS2@CoS2/MoS2 YSPs had enough internal clearance for both accommodating electrolyte and loading abundant active sites. In addition, the introduction of N and C elements greatly improved the activity and electroconductibility of the catalysts. As a result, the DSSC based on NC-CoS2@CoS2/MoS2 YSPs exhibited a superior power conversion efficiency of 9.54%, which was apparently higher than that of Pt (8.19%). Furthermore, a low onset potential of 44.5 mV and a small Tafel slope of 64.6 mV dec–1 were achieved by this catalyst for HER in 0.5 M H2SO4. The present approach affords a new idea for the design of yolk-shelled nanomaterials and can be extended to synthesize other catalysts to substitute Pt-based materials in different energy conversion fields.

Original languageEnglish
Article number128293
JournalChemical Engineering Journal
Volume409
DOIs
Publication statusPublished - 1 Apr 2021

Keywords

  • Bifunctional electrocatalysts
  • DSSCs
  • HERs
  • NC-CoS@CoS/MoS YSPs
  • Transition metal sulfides
  • Yolk-shelled structure

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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