1. Strengthening the oxygen reduction stability and activity of single iron active sites via a simultaneously electronic regulation and structure design strategy.
- Author
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Zhan, Yunfeng, Zhao, Tianyou, Wu, XiaoXian, Gao, Xiaoming, Huang, Ruishen, Zhang, Zehong, Li, Pingzhen, Guan, Xiongcong, Chen, Chengjie, Liu, Xiaojun, Tang, Xiufeng, Wang, Nan, and Meng, Hui
- Subjects
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ELECTRONIC structure , *IRON , *ACTIVATION energy , *METAL catalysts , *MASS transfer , *DENSITY of states , *OXYGEN reduction - Abstract
Single-atom iron-nitrogen-carbon materials have demonstrated remarkable potential in catalyzing the oxygen reduction reaction (ORR). In this study, a novel approach is proposed for regulating the microenvironment of single iron sites through the coupling of neighboring Zn with an open-mesoporous carbon plane. This structural arrangement effectively modulates the density of states and d-band center of Fe atoms, resulting in moderate adsorption and desorption of oxygen intermediates and thereby reducing the energy barrier of the ORR. Moreover, the open-mesoporous structure ensures the accessibility of the active sites and facilitates the mass transfer of reactants, intermediates, and products during the ORR. Consequently, the synthesized M-Fe-ZnNC catalyst exhibits enhanced ORR performance and excellent stability. This study serves to inspire the exploration of high-performance non-precious metal catalysts for the ORR, leveraging simultaneous electronic regulation and structure design. [Display omitted] • Dual-atomic Fe-Zn-Nx sites dispersed on an open-mesoporous carbon matrix was synthesized. • Zn atoms and the porous structure modulate the d-band center, dramatically lowering the energy barrier. • M-FeZnNC exhibits exceptional catalytic performance and remarkable stability. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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