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 language | English |
---|---|
Pages (from-to) | 1252-1257 |
Number of pages | 6 |
Journal | ChemPlusChem |
Volume | 78 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2013 |
Keywords
- electrocatalysis
- fuel cells
- nitrogen-doping
- oxygen reduction reaction
- platinum