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灵调节了集团-MOF的协调环境,以实现高效的电催化氧降低/进化催化

Kun Xie¹, Dongbin Wang¹, Long Lin^1,2

¹Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China.

The journal of physical chemistry letters

|April 18, 2025

概括

研究人员开发了新的2D金属有机框架 (MOFs),具有可调节的协调环境,用于高效的氧进化 (OER) 和氧减少 (ORR) 催化. 基于电子负性的描述器预测了催化性能,有助于设计先进的双功能电催化剂.

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:

具有M-N4 (金属--4) 分子的二维 (2D) 材料显示出氧化演变反应 (OER) 和氧减少反应 (ORR) 的前景.
调整这些M-N4站点的协调环境对于优化催化活动至关重要.
现有的研究重点是石墨烯和碳基支,突出显示了需要新的结构动图的需求.

研究的目的:

在金属中心 (TMA2B2) 周围构建和研究具有系统变化的协调环境的二维金属有机框架 (MOF).
阐明在这些新的2D-MOF中管理OER和ORR催化活动的结构-属性关系.
建立可靠的描述器来预测和优化双功能电催化剂的性能.

主要方法:

合成2DMOF,其中包括三烯配体和TMA2B2 (金属=Co,Rh,Ir;A/B=N,O,S,Se) 部分.
电子结构的计算分析,重点是d波段电子分布和与O2的轨道相互作用.
基于电子负性的描述器 (φ1, φ2) 的开发和应用,以将协调环境与催化活性相关联.

主要成果:

在具有多种协调环境的二维MOF中成功构建了TMA2B2部分.
证明了协调环境对金属中心的d波段电子分布有重大影响.
确定了协调原子的电子阴性和OER/ORR的催化性能之间的强烈相关性.
建立了用于预测催化活性的新描述符 (φ1, φ2).

结论:

在二维MOF中金属中心的协调环境是调整OER和ORR电催化活动的关键因素.
协调原子的电子阴性是理解和优化催化剂性能的有效描述符.
开发的结构-属性关系为设计高效的双功能电催化剂提供了一条途径,用于能源应用.

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