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Revealing and modulating catalyst reconstruction for highly efficient electrosynthesis of ammonia
揭示與調控催化劑重構以實現高效氨電合成


Xinyue Shi, Wei-Hsiang Huang , Ju Rong , Minghui Xie, Qingbo Wa, Ping Zhang, Hainan Wei, Huangyu Zhou, Min-Hsin Yeh, Chih-Wen Pao, Jie Wang, Zhiwei Hu, Xiaohua Yu*, Jiwei Ma* & Hongfei Cheng*
https://doi.org/10.1038/s41467-025-61075-8
SEED Member: Wei-Hsiang Huang, Min-Hsin Yeh

 

Structural characterizations and of Co6Ni4.

 

Major Contributions
 

1.A series of CoxNi10–x heterostructured catalysts was developed, with Co6Ni4 achieving exceptional NO3RR performance—requiring only −0.276 V to reach 1 A cm⁻², delivering up to 99.21% Faradaic efficiency for NH₃, and maintaining stability for over 120 h (and 240 h in MEA operation). 

2.Ni incorporation modulates Co’s electronic structure, enhances electron transport, and creates abundant Co/Ni interfaces that preferentially adsorb NO₃⁻/NO₂⁻ on Ni sites, keeping Co in an electron-rich state and effectively suppressing Co reconstruction and Co(OH)₂ accumulation. 

3.Operando XAS, in situ Raman, ATR-FTIR, and DFT reveal that Co6Ni4 resolves the electron-adsorbate imbalance by accelerating electron delivery and optimizing adsorption pathways, enabling highly efficient, stable, and wide-potential-range NO3RR suitable for industrial-grade ammonia synthesis.




主要貢獻
 

1.異質結構展現卓越性能:開發了一系列 CoxNi10–x異質結構催化劑,其中 Co6Ni4 表現出極為優異的硝酸鹽還原(NO₃RR)性能。

2.低電壓大電流:僅需 -0.276 V 即可達到 1 A cm-2 的工業級電流密度。

3.高效率與長壽命:氨(NH3)的法拉第效率高達 99.21%,並在一般測試中保持超過 120 小時的穩定性(在膜電極組 MEA 運行中更長達 240 小時)。

4.鎳引入調控電子結構與抑制重構:
鎳(Ni)的引入調節了鈷(Co)的電子結構,增強了電子傳輸,並創造了豐富的 Co/Ni 界面。這些界面優先將 NO₃⁻/NO₂⁻吸附在 Ni 位點上,使 Co 保持在富電子狀態(electron-rich state),從而有效抑制了 Co 的表面重構以及氫氧化鈷(Co(OH)2)的堆積。

5.解決電子-吸附質不平衡:
透過 Operando XAS、原位拉曼(In-situ Raman)、ATR-FTIR 及 DFT 計算揭示:Co6Ni4 透過加速電子傳遞與優化吸附路徑,解決了「電子-吸附質不平衡」的問題。這實現了高效、穩定且寬電位範圍的 NO₃RR,適用於工業級氨合成。