侧组调节的放大效应通过共价有机框架的imidazolate链接,以有效减少氧气
Mengyuan Chen1,2, Zhiqiang Zhu2, Youxin Ji1
1National Engineering Research Center for Advanced Polymer Processing Technology, The Key Laboratory of Material Processing and Mold of Ministry of Education, College of Materials Science and Engineering, Zhengzhou University Zhengzhou 450002 P. R. China yxji@zzu.edu.cn.
Chemical science
|June 4, 2025
概括
无金属共价有机框架 (COFs) 对氧降解反应 (ORR) 显示出希望. 用富含电子的替代物修改侧组显著放大了催化活性,提高了ORR性能.
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:
- 无金属共价有机框架 (COF) 被探索为氧减少反应 (ORR) 的催化剂.
- 通过侧组修改调节COF催化性能是具有挑战性的,因为通过部分结合链路的电子通信有限.
研究的目的:
- 为了研究ORR催化过程中COF中微妙的侧单元修改的放大效应.
- 通过在与伊米达相关的COF上引入不同的电子效应组来建立结构-性能关系.
主要方法:
- 合成四种与伊米达结合的COF,具有不同的电子效应组 (H,F,OMe,OH).
- 对COF催化剂进行氧降解反应 (ORR) 的电化学评估.
- 理论计算以了解侧组对催化中间体的影响.
主要成果:
- 基替代COF (OH-COF) 显示出更高的ORR活性.
- OH-COF实现了0.80V的半波电位 (E1/2) 与RHE相比,以及12.43A g-1的质活性,显著超过了H替代的COF.
- 来自侧组的电子效应通过结合的COF骨架有效地传输到活性位点.
结论:
- 在COF侧单元的微小变化可以导致电催化性能大幅改善.
- 中间体的电子特性和结合能力是侧组调节的关键因素,影响ORR活动.
- 这项研究为通过有针对性的结构修改设计高性能COF电催化剂提供了宝贵的见解.
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