Calcium‐Mediated Fe─N Bond Reinforcement for Ultra‐Stable Oxygen Reduction Reaction
Abstract
ABSTRACT The practical deployment of atomically dispersed Fe–N–C catalysts for the oxygen reduction reaction (ORR) is severely hampered by the electrochemical leaching of Fe active sites. Inspired by the stabilizing role of Ca 2+ in metalloenzyme active sites, a novel Fe–Ca dual‐atom sites catalyst (Ca/Fe–N–C) is constructed on amorphous porous carbon nanosheets. The introduced Ca atom acts as an “electronic modulator” and “structural stabilizer,” which effectively lowers the oxidation state of Fe and reinforces Fe–N coordination bond. This ingenious design results in an exceptional ORR catalyst with the half‐wave potential of 0.912 V in alkaline media and unprecedented durability, exhibiting negligible decay after 80000 cycles. When integrated into Zn‐air batteries (ZABs), the Ca/Fe–N–C‐based cathode delivers a peak power density of 215 mW cm −2 and sustains operation for exceeding 1110 h, markedly superior to benchmark Pt/C. This work not only unveils the pivotal role of alkaline‐earth metals in stabilizing transition‐metal sites but also establishes a general paradigm for designing durable atomically dispersed catalysts for advanced energy conversion devices.
Article Details
Authors (16)
Xuan Xie
State Key Laboratory of Biocontrol, School of Ecology, Sun Yat-sen University
Quanyu Wen
Key Laboratory of Polymer Materials of Gansu Province Analytical Testing Center College of Chemistry and Chemical Engineering Key Laboratory of Eco‐functional Polymer Materials of the Ministry of Education College of Engineering Northwest Normal University Lanzhou P. R. China
Zhuang Wu
The Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University , Changsha 410082,
Binbin Jia
Huichao Qi
Analytical Testing Center Key Laboratory of Eco‐functional Polymer Materials of the Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 P.R. China
Xiongtao Lv
Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials College of Materials and Chemical Engineering China Three Gorges University Yichang P. R. China
Aochi Liu
Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo P. R. China
Ke Cai
School of Architectural Environment and Energy Application Engineering Hunan University Changsha P. R. China
Hui Peng
Zhe Zhang
Ziqiang Lei
Key Laboratory of Eco‐functional Polymer Materials of the Ministry of Education Key Laboratory of Polymer Materials of Gansu Province College of Geography and Environment Science College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou China
Kexin Wu
Guofu Ma
Key Laboratory of Polymer Materials of Gansu Province Analytical Testing Center College of Chemistry and Chemical Engineering Key Laboratory of Eco‐functional Polymer Materials of the Ministry of Education College of Engineering Northwest Normal University Lanzhou P. R. China
Kun Liang
Jie Lin
Department of Oncology The Second Affiliated Hospital of Kunming Medical University Kunming China
Lin Guo