通过双协调设计在MOF中创建丰富的开放金属位点,以增强电催化活性
Danyu Guo1, Jieting Ding1, Chenghong Hu1
1Guangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China.
Angewandte Chemie (International ed. in English)
|September 2, 2025
概括
研究人员通过去除特定的结合物来创建有缺陷的金属有机框架 (MOF). 这些缺陷的MOF在保持结构完整的同时显著提高了氧化反应的电催化性能.
科学领域:
- 材料科学
- 催化剂
- 电化学
背景情况:
- 由于其定义的晶体结构,金属有机框架 (MOF) 对于研究结构属性关系非常有价值.
- 在MOF中,有限的金属位置阻碍了催化活性.
- 现有的创建开放金属位点的方法往往会损害MOF的结构完整性,阻碍机械研究.
研究的目的:
- 开发一种在不损害结构完整性的情况下在MOF中创建不和金属位点的方法.
- 通过增加可访问的金属位点来提高电催化性能.
- 在电催化中进行详细的结构性质关系研究.
主要方法:
- 使用 Zn-N 和 Zn-O 键将单协调的 MOF (Zn-N ZIF-L) 转换为双协调的 MOF (B-MOF).
- 在500°C时对B-MOF进行火,以选择性地切割较弱的Zn-O键,产生具有开放Zn位点的缺陷MOF (dB-MOF).
- 使用材料科学技术和理论计算进行表征.
- 在碳布上对dB-MOF进行电催化测试,以检测氧化反应 (HzOR).
主要成果:
- 成功合成有缺陷的MOF (dB-MOF),具有丰富的开放Zn位点和保存的晶体结构.
- 与原始的B-MOF相比,dB-MOF对氧化反应 (HzOR) 的电催化性能显著提高.
- 材料的特性和理论计算证实了由于Zn-O键的去除而产生缺电子的Zn位点.
- 这些缺电子位点有效地增强反应中间体的吸附,并降低HzOR的能量障碍.
结论:
- 在双协调的MOF中选择性结合裂变是一种有效的策略,用于产生具有催化活性的不和金属位点.
- 开发的dB-MOF为高性能电催化和深入结构性质调查提供了强大的平台.
- 这种方法为设计具有定制活性位的先进MOF催化剂提供了途径.
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