Thermal stability and potential cycling durability of nitrogen-doped graphene modified by metal-organic framework for oxygen reduction reactions

Harsimranjit Singh, Shiqiang Zhuang, Bharath Babu Nunna, Eon Soo Lee

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Here we report a nitrogen-doped graphene modified metal-organic framework (N-G/MOF) catalyst, a promising metal-free electrocatalyst exhibiting the potential to replace the noble metal catalyst from the electrochemical systems; such as fuel cells and metal-air batteries. The catalyst was synthesized with a planetary ball milling method, in which the precursors nitrogen-functionalized graphene (N-G) and ZIF-8 are ground at an optimized grinding speed and time. The N-G/MOF catalyst not only inherited large surface area from the ZIF-8 structure, but also had chemical interactions, resulting in an improved Oxygen Reduction Reaction (ORR) electrocatalyst. Thermogravimetric Analysis (TGA) curves revealed that the N-G/MOF catalyst still had some unreacted ZIF-8 particles, and the high catalytic activity of N-G particles decreased the decomposition temperature of ZIF-8 in the N-G/MOF catalyst. Also, we present the durability study of the N-G/MOF catalyst under a saturated nitrogen and oxygen environment in alkaline medium. Remarkably, the catalyst showed no change in the performance after 2000 cycles in the N 2 environment, exhibiting strong resistance to the corrosion. In the O 2 saturated electrolyte, the performance loss at lower overpotentials was as low compared to higher overpotentials. It is expected that the catalyst degradation mechanism during the potential cycling is due to the oxidative attack of the ORR intermediates.

Original languageEnglish (US)
Article number607
JournalCatalysts
Volume8
Issue number12
DOIs
StatePublished - Dec 2018

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

Keywords

  • Durability study
  • Metal-organic framework
  • Nitrogen-doped graphene
  • Oxygen reduction reaction
  • Potential cycling
  • Rotating disk electrode

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