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A-Site Cation Deficiency in Antiperovskites for Precisely Accelerating the Volmer Step of Alkaline Hydrogen Evolution
反鈣鈦礦中的 A 位陽離子缺陷:精準加速鹼性析氫的 Volmer 步驟


Yan Chen, Zuoqing Liu, Bin Chen, Wei-Hsiang Huang, Zheng Tang, Mingkai Xu, Min-Hsin Yeh, Chih-Wen Pao, Mingjie Pu, Guangming Yang, Yufeng Guo, Zhiwei Hu, Yinlong Zhu
https://doi.org/10.1002/aenm.202503319
SEED Member: Min-Hsin Yeh, Wei-Hsiang Huang

 

Schematic illustration of catalysis mechanism for alkaline HER on the In0.9NNi3 antiperovskite.

 

Major Contributions
 

1.Introduction of A-site (In) deficiency in antiperovskite InNNi₃ optimizes electronic structure and interfacial water behavior, effectively accelerating the Volmer step by facilitating water dissociation and OH⁻ desorption. 

2.The engineered In₀.₉NNi₃ catalyst exhibits outstanding alkaline HER activity with a low overpotential of 161 mV at 10 mA cm⁻² and a Tafel slope of 55 mV dec⁻¹, surpassing the stoichiometric InNNi₃ and most reported non-noble-metal catalysts. 

3.In₀.₉NNi₃ demonstrates excellent practical applicability in an anion exchange membrane water electrolyzer, achieving 1 A cm⁻² at 1.92 V and maintaining stable operation for 100 h, outperforming commercial Raney Ni.




主要貢獻
 

1.缺陷工程優化機制:在反鈣鈦礦(Antiperovskite)InNNi3 中引入 A 位(銦,In)缺陷,能優化電子結構與界面水行為。這項調整透過促進水分子解離與 OH-(氫氧根)脫附,有效加速了 Volmer 步驟。

2.優異的電化學活性:經調控的 In0.9NNi3 催化劑展現出色的鹼性析氫反應(HER)活性。在 10 mA cm-2 電流密度下,其過電位(overpotential)僅為 161 mV,塔菲爾斜率(Tafel slope)為 55 mV dec-1,性能優於標準化學計量比的 InNNi3 及大多數已報導的非貴金屬催化劑。

3.卓越的實際應用性:In0.9NNi3 在陰離子交換膜水電解槽(AEMWE)中展現極佳的實用性,能在 1.92 V 電壓下達到 1 A cm-2 的大電流密度,並穩定運作 100 小時,性能超越商用雷尼鎳(Raney Ni)。