催化作用
氧气
反键分子轨道
金属
材料科学
氮气
自旋态
碳纤维
氧还原反应
化学
氧还原
化学工程
纳米技术
过渡金属
无机化学
物理化学
原子轨道
电子
有机化学
电化学
冶金
物理
电极
量子力学
复合数
复合材料
工程类
作者
Gege Yang,Jiawei Zhu,Pengfei Yuan,Yongfeng Hu,Gan Qu,Bang‐An Lu,Xiaoyi Xue,Yin Hengbo,Wenzheng Cheng,Junqi Cheng,Wenjing Xu,Jin Li,Jin‐Song Hu,Shichun Mu,Jianan Zhang
标识
DOI:10.1038/s41467-021-21919-5
摘要
Abstract As low-cost electrocatalysts for oxygen reduction reaction applied to fuel cells and metal-air batteries, atomic-dispersed transition metal-nitrogen-carbon materials are emerging, but the genuine mechanism thereof is still arguable. Herein, by rational design and synthesis of dual-metal atomically dispersed Fe,Mn/N-C catalyst as model object, we unravel that the O 2 reduction preferentially takes place on Fe III in the FeN 4 /C system with intermediate spin state which possesses one e g electron (t 2g 4e g 1) readily penetrating the antibonding π-orbital of oxygen. Both magnetic measurements and theoretical calculation reveal that the adjacent atomically dispersed Mn-N moieties can effectively activate the Fe III sites by both spin-state transition and electronic modulation, rendering the excellent ORR performances of Fe,Mn/N-C in both alkaline and acidic media (halfwave positionals are 0.928 V in 0.1 M KOH, and 0.804 V in 0.1 M HClO 4 ), and good durability, which outperforms and has almost the same activity of commercial Pt/C, respectively. In addition, it presents a superior power density of 160.8 mW cm −2 and long-term durability in reversible zinc–air batteries. The work brings new insight into the oxygen reduction reaction process on the metal-nitrogen-carbon active sites, undoubtedly leading the exploration towards high effective low-cost non-precious catalysts.
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