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- Title
Disentangling the Activity‐Stability Trade‐Off of Pyrrolic N‐Coordinated Fe─N<sub>4</sub> Catalytic Sites for Long‐Life Oxygen Reduction Reaction in Acidic Medium.
- Authors
Xue, Dongping; Zhao, Shuyan; Lu, Bang‐An; Yu, Yue; Wei, Yifan; Yin, Hengbo; Hu, Jin‐Song; Zhang, Jianan
- Abstract
Fe─N─C materials with Fe─N4 sites are considered as most promising non‐precious metal‐based electrocatalysts for low‐cost proton‐exchange‐membrane fuel cells (PEMFCs). Breaking the trade‐off between activity and stability has been a long‐standing challenge in the field of acidic oxygen reduction reaction (ORR). Herein, a "top‐down" thermally‐driven strategy is developed to achieve highly active pyrrolic N‐coordinated Fe sites in a high spin state with Fe atomic cluster (Fen@Fe─Npyrr─C) and discover that the neighboring Fen cluster can synergistically stabilize such vulnerable Fe─N4 sites by inhibiting their protonation. Consequently, the Fen@Fe─Npyrr─C catalysts exhibit much enhanced ORR activity and stability, endowing PEMFCs with a high power density of 804.6 mW cm−2 (testing conditions: 80 °C, 100% RH, 2.0 bar) and over 100 h durability (at 0.5 V). These findings open up opportunities for the exploration of durable Fe─N─C ORR electrocatalysts for non‐precious metal‐based PEMFCs and other applications.
- Subjects
ATOMIC clusters; FUEL cells; ELECTROCATALYSTS; POWER density; PROTON transfer reactions; MICROCLUSTERS; CATALYSTS; OXYGEN reduction
- Publication
Advanced Energy Materials, 2024, Vol 14, Issue 12, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202303733