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Published on: October 6, 2023
Axial chlorine coordination reconstructs Fe-N4 electronic structure for efficient pH-universal oxygen reduction
Yanle Yuan1, Xia Zhang2, Feilong Qin1
1College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Chemical Power Sources, Central South University, Changsha 410083, China.
Abstract:
Current Fe single-atom catalysts suffer from active-site blockage and aggregation. This study creates 2D nanosheet catalysts with axial chlorine-coordinated Fe-N4 sites (Fe-N4Cl) via molten salt-assisted pyrolysis. This configuration tunes the electronic structure, enhancing oxygen reduction. The catalyst outperforms Pt/C in alkaline, neutral, and acidic electrolytes, with half-wave potentials of 0.921 V, 0.742 V, and 0.771 V, respectively. In Zn-air batteries, it achieves a high power density of 176.5 mW cm-2 and stability over 720 hours, showing great potential for efficient energy conversion.
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