Phosphorus Incorporation into Co9S8 Nanocages for Highly Efficient Oxygen Evolution Catalysis

Bocheng Qiu, Lejuan Cai, Yang Wang, Xuyun Guo, Sainan Ma, Ye Zhu, Yuen Hong Tsang, Zijian Zheng, Renkui Zheng, Yang Chai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)

Abstract

The improvement of activity of electrocatalysts lies in the increment of the density of active sites or the enhancement of intrinsic activity of each active site. A common strategy to realize dual active sites is the use of bimetal compound catalysts, where each metal atom contributes one active site. In this work, a new concept is presented to realize dual active sites with tunable electron densities in monometal compound catalysts. Dual Co2+ tetrahedral (Co2+(Td)) and Co3+ octahedral (Co3+(Oh)) coordination active sites are developed and adjustable electron densities on the Co2+(Td) and Co3+(Oh) are further achieved by phosphorus incorporation (P-Co9S8). The experimental results and density functional theory calculations show that the nonmetal P doping can systematically modulate charge density of Co2+(Td) and Co3+(Oh) in P-Co9S8 and simultaneously improve the electrical conductivity of Co9S8, which substantially enhances oxygen evolution reaction performance of P-Co9S8.

Original languageEnglish
Article number1904507
JournalSmall
Volume15
Issue number45
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • catalytic sites
  • electron modulation
  • nanocages
  • oxygen evolution reaction
  • phosphorus doping

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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