在一个二维导电金属有机框架上的高度定义和密集的双金属活性位点的计算引导设计,以实现高效的H2O电合成
Zhenxin Li1, Jingjing Jia1, Zhiyuan Sang1
1Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China.
Angewandte Chemie (International ed. in English)
|August 8, 2024
概括
研究人员开发了一种新的无基质金属有机框架催化剂,用于高效的过氧化 (H2O2) 的电化学合成. 这种新的催化剂具有很高的选择性和产量,可以替代传统方法.
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:
- 通过两电子氧降解反应 (2e-ORR) 的过氧化 (H2O2) 的电化学合成,是高能耗的 antraquinone 方法的替代方案.
- 现有的2e-ORR金属宏循环催化剂通常需要导电基板,导致不活跃的部位和降低H2O2生产效率.
- 开发具有高密度活性位点的无基质催化剂对于改善H2O2电合成至关重要.
研究的目的:
- 设计和合成一个无基质的二维导电金属有机框架 (Ni-TCPP(Co)) 作为H2O2电合成的多站点催化剂.
- 在性和中性电解质中研究Ni-TCPP ((Co) 对2e-ORR的催化性能.
- 探索合成的H2O2在净水和消毒中的潜在应用.
主要方法:
- 第一个原则的预测被用来指导Ni-TCPP(Co) 催化剂的设计.
- 由CoN4位点和Ni2O8节点组成的催化剂被合成为无基质的二维导电材料.
- 在性和中性电解质中评估了电化学性能,测量了H2O2的选择性和产量.
主要成果:
- 尼-TCPP (Co) 催化剂表现出卓越的2e-ORR电催化性能.
- 实现了高的H2O2选择性 (>90%在性中,>85%在中性电解质中) 和产量 (>18.2molg-1h-1在性中,>18.0molg-1h-1在中性中).
- 催化剂的内在导电性,多孔性和精确控制的活性位点距离有助于其高效率.
结论:
- 无基质的Ni-TCPP ((Co) 金属有机框架是一种有效的多站点催化剂,用于高效的H2O2电合成.
- 该战略为设计具有高密度活性位点和精确协调的催化剂提供了一种新方法.
- 合成的H2O2显示出可用于水净化和消毒等实际应用的可行性.
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