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增强氧进化的起源在重组的金属有机框架中,用于离子交换膜水电解

Ying Li¹, Liu Yang², Xiaolei Hao³

¹School of Physics, Harbin Institute of Technology, Harbin, 150001, P. R. China.

Angewandte Chemie (International ed. in English)

|September 13, 2024

概括

在以为基础的金属有机框架 (MOF) 中的铁兴奋剂增强了氧演化反应 (OER) 催化作用的结构演变. 这种优化的MOF催化剂在水电解中实现了高电流密度.

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:

金属有机框架 (MOF) 是氧化演化反应 (OER) 的有希望的催化剂,因为它们具有可调的结构.
了解OER期间的MOF转换对于催化剂设计至关重要,特别是在工业条件下.
在高电流OER下,MOF的结构-活动关系仍然难以阐明.

研究的目的:

在OER期间调查Fe兴奋剂对基于Ni的MOF重建对Fe兴奋剂的影响.
为了阐明Fe注诱导的结构和电子变化的机制Ni(Fe) MOFs.
评估重建的Ni(Fe) MOFs作为阳极在离子交换膜水电解中的性能.

主要方法:

用于MOF重建的受控电氧化.
现场拉曼和紫外线/可见光谱用于监测结构变化.
理论建模 (DFT) 以了解电子结构和吸附特性.
离子交换膜水电解用于性能测试.

主要成果:

铁兴奋剂加速了Ni(Fe) MOF的结构演变,由Ni-O键延长证明.
现场光谱学证实了电氧化过程中的结构变化.
理论计算显示,Fe合剂和拉力应变增强了Ni-Op杂交,优化了吸附.
重建的Ni(Fe) MOF阳极在2.2V时实现了3300 mA cm−2,并在高电流密度下表现出色的稳定性.

结论:

兴奋剂有效地重建基于Ni的MOF,增强其OER活性和稳定性.
该研究提供了对MOF催化剂重建机制的见解,以改善电化学性能.
这项工作为设计用于水电解和其他电化学应用的先进催化剂提供了途径.

关键词:

离子交换膜水电解水的电解.动态的重建重建.在现场拉曼拉曼.金属有机框架氧气进化反应反应氧气进化反应

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