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在 (Ni,Fe) OOOH中识别高活性Fe位点,用于电催化水分解

Daniel Friebel¹, Mary W Louie, Michal Bajdich

¹Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Mail Stop 976, Berkeley, California 94720, United States.

Journal of the American Chemical Society

|January 7, 2015

概括

氧化演化反应 (OER) 的高活性催化剂对于高效的生产至关重要. 混合 (Ni,Fe) 氧化因特定的Fe3+) 位结构而呈现500倍的OER增强,使它们成为优越的催化剂.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

通过水分的高效气生产对于可再生能源至关重要.
光电化学装置需要高活性氧演化反应 (OER) 催化剂.
混合 (Ni,Fe) 氧化水氧化物作为先进的OER催化剂显示出希望.

研究的目的:

阐明混合 (Ni,Fe) 氧化中显著的OER活性增强的来源.
确定负责增强催化性能的活性位点.
了解推动改善开放资源活动的结构和电子因素.

主要方法:

操作X射线吸收光谱 (XAS) 具有高能分辨率光检测 (HERFD).
计算方法 (例如,密度函数理论) 来建模催化机制.
混合 (Ni,Fe) 氧化 (Ni(1-x) Fe(x) OOH) 的合成和表征.

主要成果:

混合 (Ni,Fe) 氧化水氧化物与纯的Ni和Fe化合物相比,OER活性增加了500倍.
在Ni(1-x) Fe(x) OOH中的Fe3+) 离子占据具有短Fe-O键距离的八面体位点.
计算分析揭示了Fe位点的OER中间体的最佳吸附能量,导致低的过度潜力.
在混合氧化氧化物中的位被发现对水氧化不活跃.

结论:

在Ni{1-x) Fe{-x) OOH中Fe{3+) 的结构图案是对特殊的OER活动负责的.
在这些催化剂中,Fe位点,而不是Ni位点,是氧气演化反应的活性中心.
这项工作为设计高效的OER催化剂提供了基本的见解,用于水分裂.

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