将电子存储皮佩拉津集成到共价有机框架中,以促进氧降解反应
Shuang Zheng1,2, Yubin Fu3,4, Xiaoyu Xu1
1CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences (CAS), Shanghai, 201210, P.R. China.
无金属共价有机框架 (COF) 具有氧化还原活性 piperazine 单元和- tautomerism 通过改善电子转移和中间结合,显示增强的氧降解反应 (ORR) 催化.
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) 是氧降解反应 (ORR) 的有希望的电催化剂.
- 低效的电子转移和弱的中间结合限制了它们的催化活性.
- 开发高效的无金属催化剂对于可持续能源技术至关重要.
研究的目的:
- 为了增强ORR无金属COF的催化活性.
- 为了克服低效的电子转移和弱中间结合的局限性.
- 为先进的催化COF建立一个新的设计策略.
主要方法:
- 将氧化还原活性皮佩拉津单元纳入COF,以促进电子存储和转移.
- 引入基 (−OH) 基组以诱导-联并增强框架极性.
- 电化学表征以评估催化性能 (半波潜力,周转频率).
- 理论计算以了解功能组对中间体的协同效应.
主要成果:
- 优化的PD-COF-OH表现出0.76V的高半波潜力和0.045s-1.1的旋转频率.
- 增强的框架极性 (双极矩为6.87德拜) 改善了中间结合.
- 氧化还原活性皮佩拉津单元加速了电子转移到催化站点.
- 理论计算证实了 ─OH 和 CO 组在稳定关键中间体 (OOH* 和 OH*) 中的协同作用.
结论:
- 与大多数报告的对应物相比,开发的无金属COF显示出优越的ORR催化活性.
- 合理的设计整合电子储存单元和极性调制通过 tautomerism 提供了一个新的范式设计高性能COFs.
- 这种方法在推进环保电化学能量转换装置方面具有重大潜力.
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