Hybrid structure of tio2-graphitic carbon as a support of pt nanoparticles for catalyzing oxygen reduction reaction

Su Jin Jang, Yun Chan Kang, Jin Su Hyun, Tae Ho Shin, Young Wook Lee, Kwang Chul Roh

Research output: Contribution to journalArticlepeer-review

Abstract

The durability of catalysts in fuel cells is a longstanding issue that needs to be re-solved.Catalyst stability of the fuel cell has always been a problem, studies are underway to address them. Herein, to address this issue, we synthesize a hybrid structure consisting of SP carbon (SP) as the graphitic carbon and TiO2 as the metal oxide using a microwave method for use as a support for Pt nanoparticles. Anatase TiO2 and Pt nanoparticles with sizes of ~5 and 3.5 ± 1.4 nm, respectively, are uniformly dispersed on a modified graphitic SP carbon support (Pt-TiO2-SP). This supported Pt catalyst exhibits significantly improves durability in the oxygen reduction reaction (ORR). Further-more, the Pt-TiO2-SP carbon hybrid catalyst manifests superior electrocatalytic stability and higher onset potential in ORR than those exhibited by Pt-SP carbon without TiO2. Pt-TiO2-SP exhibits an activity loss of less than 68 mV after 5000 electrochemical cycles, whereas an activity loss of ~100 mV is observed for Pt-SP carbon in a stability test. These results suggest that the strong metal–support interaction in TiO2-supported Pt catalyst significantly enhances the activity of Pt nanocatalyst.

Original languageEnglish
Article number1196
JournalCatalysts
Volume11
Issue number10
DOIs
Publication statusPublished - 2021 Oct

Keywords

  • Catalyst support
  • Durability
  • Fuel cell
  • Graphitic carbon
  • TiO-carbon hybrid

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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