同时调整异构集金属有机框架中的水稳定性和光电活性,以实现高效的光催化生产
Yu-Jia Cheng1,2, Jian-Qiang Zhao1, Xiong-Feng Ma2
1State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China.
Advanced materials (Deerfield Beach, Fla.)
|April 3, 2025
概括
具有集成铜集群的工程金属有机框架 (MOF) 显示了可持续生产的增强稳定性和可见光活性. 替代显著提高了性能,使得没有贵金属的进化率翻了一番.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 纳米技术 纳米技术
背景情况:
- 在金属有机框架 (MOF) 中实现结构稳定性和光活性对于高效的光催化 (H2) 生产至关重要.
- 当前的MOF设计面临着在不同条件下平衡稳定性的挑战,同时具有最佳的催化电子特性.
研究的目的:
- 开发具有增强结构完整性和光电化学性质的新型MOF,用于可持续的H2生成.
- 调查精确集群工程和素替代对光催化中的MOF性能的影响.
主要方法:
- 原子精确的异构群组件,以构建具有cds净的同结构3DMOF (CuSL-CuX,X = Cl,Br).
- 在MOF结构中整合了六核铜-硫 {Cu6S6} 和二核铜-素 {Cu2X2} 集群.
- 在广泛的pH范围 (1-14),可见光吸收,氧化还原潜力,电荷载体动力学和光催化H2进化速率中对MOF稳定性的表征.
主要成果:
- 两种同结构MOF,CuSL-CuCl和CuSL-CuBr,已成功合成,在pH值1到14之间表现出异常稳定性.
- 与CuSL-CuCl (26.99 mmol g-1 h-1) 相比,CuSL-CuBr表现出明显更高的H2进化率 (50.28 mmol g-1 h-1),超过了许多现有的MOF光催化剂.
- 发现替代能优化电子结构,完善轨道分布,加速电荷分离,提高光催化效率.
结论:
- 异质集群组装方法使得能够设计出具有可调节光电子性能的强大的MOF.
- 素替代,特别是,是增强MOFs用于H2生产的光催化活性的一个关键战略.
- 这项工作通过精确的集群工程为开发高性能,稳定的基于MOF的光催化剂提供了新的范式.
相关概念视频
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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