1. Creating Defects in the Active Site of Fe−N−C Catalyst Promotes Catalytic Performance for Oxygen Reduction Reaction.
- Author
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Yang, Kun‐Zu, Xu, Chao, Guo, Peng‐Peng, Lu, Chen, Xu, Ying, Chi, Hua‐Min, Wei, Ping‐Jie, and Liu, Jin‐Gang
- Subjects
OXYGEN reduction ,METAL catalysts ,CATALYTIC activity ,ELECTROCATALYSTS ,PRECIOUS metals ,ENERGY conversion ,IRON catalysts - Abstract
Developing efficient non‐precious metal electrocatalysts to replace Pt‐based noble metal catalysts for oxygen reduction reaction (ORR) in energy conversion devices is highly desirable. Atomically dispersed Fe−N−C catalysts are the most promising alternatives of Pt for ORR; however, enhancing their intrinsic activity via active site modulation is still a challenge. Using an iron porphyrin‐functionalized MOFs as the precursor, we prepared a defects‐rich Fe−N−C catalyst and modulated its intrinsic activity by creating defects near the Fe−Nx sites through decarboxylation reaction. Due to the synergistic effect of the improved porous structure and created defects, the prepared Defects‐FeNC exhibited excellent performance for ORR with half‐wave potential of 0.895 V vs. RHE in alkaline media. The Defects‐FeNC loaded Zn‐Air battery delivered much higher open circuit potential (OCP=1.463 V) and maximum power density (Pmax=151 mW cm−2) than the commercial 20 wt.% Pt/C (OCP=1.441 V; Pmax=119 mW cm−2) under similar experimental conditions. Defects in the catalyst could modulate the electronic structure of the Fe−Nx−C center that further promoted the catalyst catalytic activity for ORR. This work provides a facile active‐sites‐engineering approach for boosting the Fe−N−C catalyst ORR performance, which shows promising implications in energy conversion devices. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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