催化作用
氧还原
氧还原反应
对偶(语法数字)
氧气
碳纤维
还原(数学)
氧原子
机制(生物学)
Atom(片上系统)
化学
镍
兴奋剂
无机化学
材料科学
物理化学
有机化学
分子
光电子学
数学
计算机科学
电化学
电极
复合材料
嵌入式系统
艺术
几何学
文学类
物理
复合数
量子力学
作者
Yaodan Zhou,Wen Yang,Wellars Utetiwabo,Yimeng Lian,Xue Yin,Lei Zhou,Peiwen Yu,Renjie Chen,Shaorui Sun
标识
DOI:10.1021/acs.jpclett.9b03771
摘要
Herein, we synthesized a Fe, Ni dual-metal embedded in porous nitrogen-doped carbon material to endow higher turnover frequency (TOF), lower H2O2 yield, and thus superior durability than for the single-atom catalyst for oxygen reduction in acid media. Quantitative X-ray absorption near edge structure (XANES) fitting and density functional theory (DFT) calculation were implemented to explore the active sites in the catalysts. The results suggest FeNi-N6 with type I (each metal atom coordinated with four nitrogen atoms) instead of type II configuration (each metal atom coordinated with three nitrogen atoms) dominates the catalytic activity of the noble-metal free catalyst (NMFC). Further, theoretical calculation reveals that the oxygen reduction reaction (ORR) activity trend of different moieties was FeNi-N6 (type I) > FeNi-N6 (type II) > Fe-N4 > Fe2-N6. Our research represents an important step for developing dual-metal doping NMFC for proton exchange membrane fuel cells (PEMFCs) by revealing its new structural configuration and correlation with catalytic activity.
科研通智能强力驱动
Strongly Powered by AbleSci AI