Synergistic regulation of nickel doping/hierarchical structure in cobalt sulfide for high performance zinc-air battery

Jie Wang, Jinxiao Xu, Xuyun Guo, Tao Shen, Cuijuan Xuan, Baoling Tian, Zhaorui Wen, Ye Zhu, Deli Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Reduced-graphene-nanoribbon supported nickel doped Co9S8 spheres (Ni-Co9S8/rGN) have been successfully constructed. The hierarchical structured sphere assembles by spindle-type nanorods features high surface area and good hydrophilicity property. Excellent OER/ORR activities and long-term stabilities are obtained on Ni-Co9S8/rGN relative to Pt/C and RuO2. Density functional theory calculations demonstrate that nickel dopants in Co9S8 structure effectively optimizes the adsorption properties at the rate-determining steps. Therefore, the synergistic regulation between the rGN covered hierarchical structure and nickel dopants by promoting the intrinsic ORR/OER properties, electrical conductivity, and mass transfer is responsible to the superior catalytic performance. Moreover, as a bi-functional catalyst for liquid and flexible Zn–air batteries, Ni-Co9S8/rGN based battery exhibits excellent battery performance, especially high power density, superior rate performance and long-term cycling stability, providing a new vision for the preparation of high-efficiency catalysts in energy conversion.

Original languageEnglish
Article number120539
JournalApplied Catalysis B: Environmental
Volume298
DOIs
Publication statusPublished - 5 Dec 2021

Keywords

  • Hierarchical porous structure
  • Nickel doped CoS
  • Oxygen reduction/evolution reaction
  • Synergistic regulation
  • Zn-air battery

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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