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- Title
Unravelling the Structure of Electrocatalytically Active Fe-N Complexes in Carbon for the Oxygen Reduction Reaction.
- Authors
Zhu, Yansong; Zhang, Bingsen; Liu, Xin; Wang, Da‐Wei; Su, Dang Sheng
- Abstract
Non-precious Fe/N co-modified carbon electrocatalysts have attracted great attention due to their high activity and stability in oxygen reduction reaction (ORR). Compared to iron-free N-doped carbon electrocatalysts, Fe/N-modified electrocatalysts show four-electron selectivity with better activity in acid electrolytes. This is believed relevant to the unique Fe-N complexes, however, the Fe-N structure remains unknown. We used o,m,p-phenylenediamine as nitrogen precursors to tailor the Fe-N structures in heterogeneous electrocatalysts which contain FeS and Fe3C phases. The electrocatalysts have been operated for 5000 cycles with a small 39 mV shift in half-wave potential. By combining advanced electron microscopy and Mössbauer spectroscopy, we have identified the electrocatalytically active Fe-N6 complexes (FeN6, [FeIII(porphyrin)(pyridine)2]). We expect the understanding of the FeN6 structure will pave the way towards new advanced Fe-N based electrocatalysts.
- Subjects
ELECTROCATALYSTS; OXYGEN reduction; ELECTROLYTES; PHENYLENEDIAMINES; ELECTRON microscopy
- Publication
Angewandte Chemie International Edition, 2014, Vol 53, Issue 40, p10673
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201405314