Nitrogen-doped Pt/C electrocatalysts with enhanced activity and stability toward the oxygen reduction reaction

Sang Il Choi, Su Un Lee, Ran Choi, Joon T. Park, Sang Woo Han

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Recently, nitrogen-doped carbon materials have proved to be effective catalytic platforms for the oxygen reduction reaction (ORR). Despite the recent synthetic advances for the preparation of nitrogen-incorporated carbon materials, the low-temperature and water-based synthesis of nitrogen-doped carbon materials has rarely been explored due to the difficulties in nitrogen-doping under such mild conditions. Here, nitrogen-doped Pt/C (Pt/NC) catalysts are prepared using a facile, low-temperature, aqueous-phase method. Hydrazine treatment of a Pt/C catalyst successfully yields Pt/NC with controlled nitrogen content. The as-prepared Pt/NC catalysts exhibit enhanced electrocatalytic activity and stability toward ORR in comparison to nitrogen-free Pt/C, and their ORR activities are highly dependent on the level of nitrogen-doping. The Pt/NC catalyst containing 2.0a at % nitrogen results in the largest improvement of ORR activity. It's all about the levels: Hydrazine treatment of a Pt/C catalyst successfully yielded nitrogen-doped Pt/C (Pt/NC) with controlled nitrogen content. The as-prepared Pt/NC catalysts exhibited enhanced electrocatalytic activity and stability toward the oxygen reduction reaction (ORR), and the corresponding ORR activity is highly dependent on the level of nitrogen-doping (see figure; RHE=reversible hydrogen electrode).

Original languageEnglish
Pages (from-to)1252-1257
Number of pages6
JournalChemPlusChem
Volume78
Issue number10
DOIs
StatePublished - Oct 2013

Keywords

  • electrocatalysis
  • fuel cells
  • nitrogen-doping
  • oxygen reduction reaction
  • platinum

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