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南京理工大学朱俊武/张文耀&港城大刘彬,最新JACS:氯桥接双铁原子催化剂用于高效稳定的氧还原反应

  • 2026-02-21 00:10:55
南京理工大学朱俊武/张文耀&港城大刘彬,最新JACS:氯桥接双铁原子催化剂用于高效稳定的氧还原反应

第一作者:Junjie CuiWenyao Zhang

通讯作者:朱俊武、刘彬、张文耀

通讯单位:南京理工大学、香港城市大学

研究背景和内容

原子分散的铁--碳(Fe-N-C)催化剂在氧还原反应(ORR)中具有巨大的应用潜力,但其在运行条件下的结构不稳定限制了其实际应用。

在本研究中,作者发现Fe-N-C催化剂的电化学降解源于ORR过程中Fe-N键与Fe-O键之间的动态差异,导致显著的铁去金属化现象。
研究要点

要点1.本文合成了具有明确的N3−Fe−Cl−Fe−N3结构的双铁原子催化剂。由此产生的双铁原子催化剂表现出出色的氧还原反应稳定性,铁元素流失量极低(在20000次加速耐久性循环后为16.4 μg L-1),并且在160小时的运行中电流保持率为88%。这种催化剂在锌-空气电池中实现了超过1000小时的稳定性能,且过电位增加极小。

要点2.研究表明,桥接的Cl原子诱导电荷重新分布,并降低铁d能带中心,从而调节含氧中间体的吸附和活化。在ORR过程中Fe-O键所获得的电子能量触发了N3−Fe−Cl−Fe−N3部分的动态重组,这反过来又强化了结构中的Fe-NFe-Cl键,同时减弱了高能的Fe-O作用。这种动态过程能够实现灵活的协调配合,并加快质子化反应速率,突显了双铁中心金属配位的协同效应,从而确保了电化学的稳定性。

2Fe2-NC-850催化剂的合成方法。(aFe2-NC-850AC-HAADF-STEM图像,其中放大的插图突出显示了原子特征。(b)从区域1234提取的强度分布。(cFe2-NC-850和参比样品的k3-加权FT-EXAFS;dFe2-NC-850EXAFS拟合曲线;eFe2-NC-850KXANES;fFe2-NC-850k3-加权FT-EXAFS; Fe2-NC-x的加权FT-EXAFS光谱。(g)显示Fe2-NC-850的合成方法的示意图。

3ORR性能。(aLSV曲线和(b)相应的Tafel图。(c)不同ADT循环后Fe2-NC-850Fe1-NC的ΔE1/2Fe物质摩尔溶解的变化。(dFe2-NC-850Fe1-NC、(eFe2-NC-850与参考催化剂之间的E1/2值和电流衰减速率的比较。(fFe2-NC-850与商业Pt/C作为空气阴极的恒电流放电曲线。(g)使用Fe2-NC-850Pt/CZAB的充电-放电循环性能。

参考文献:Junjie CuiWenyao ZhangYangrui Hou. et al.Geminal Cl-Bridged Dual-Fe-Atom Catalyst for Efficient and Stable Oxygen Reduction Reaction. JACS.(2025).

文献链接:

https://pubs.acs.org/doi/10.1021/jacs.5c15456

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      1. CONNECT:[ UseTime:0.001119s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001598s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000663s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000670s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001253s ]
      6. SELECT * FROM `set` [ RunTime:0.000547s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001393s ]
      8. SELECT * FROM `article` WHERE `id` = 461984 LIMIT 1 [ RunTime:0.001264s ]
      9. UPDATE `article` SET `lasttime` = 1772671016 WHERE `id` = 461984 [ RunTime:0.023794s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000746s ]
      11. SELECT * FROM `article` WHERE `id` < 461984 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001170s ]
      12. SELECT * FROM `article` WHERE `id` > 461984 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001004s ]
      13. SELECT * FROM `article` WHERE `id` < 461984 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004582s ]
      14. SELECT * FROM `article` WHERE `id` < 461984 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.017236s ]
      15. SELECT * FROM `article` WHERE `id` < 461984 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004612s ]
      0.216243s