氧化还原介导氧进化反应:通过两步腐蚀策略在CeFeCo-UiO-66/层双氧化物中的工程氧气空缺和异质连接
Jianan Wang1, Dan Wen1, Xiujuan Li1
1College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China.
Journal of colloid and interface science
|May 4, 2025
概括
研究人员设计了具有氧空缺 (VO) 的金属有机框架 (MOF),以改善氧演化反应 (OER) 电催化. 通过氧化还原反应控制的VO生成显著增强了催化活性.
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:
- 金属有机框架 (MOF) 对电催化剂至关重要,但优化氧演化反应 (OER) 性能需要进一步修改.
- 众所周知,氧气空缺 (VO) 增强了OER,但它们的受控生成和对催化活动的确切影响仍未得到充分探索.
研究的目的:
- 在基于MOF的电催化剂中开发一种可控生成氧空缺 (VO) 的方法.
- 研究VO度与OER催化活性之间的关系.
- 阐明VO物种提高开放式资源资源表现的机制.
主要方法:
- 利用 (Co) 和 (Ce) 之间的氧化还原电位差异来诱导受控的腐蚀并产生VO.
- 将VO含量与腐蚀时间相关联,并通过电子磁共振 (EPR) 进行验证.
- 采用X射线光电子光谱 (XPS),EPR,现场拉曼和密度函数理论 (DFT) 进行机械分析.
主要成果:
- 一个CeFeCo-UiO-66/LDH催化剂表现出异常的OER活性,具有较低的超电位 (η = 273 ± 3 mV @ 100 mA cm-2).
- 证实Ce和Co之间的氧化还原相互作用产生VO,内容可通过腐蚀时间控制.
- 发现VO物种在OER期间促进了活性氧化 (CoOOH) 物种的形成.
结论:
- 该研究成功地展示了在MOF电催化剂中控制VO生成的策略.
- 这些发现强调了VO在通过促进活跃网站形成来增强开放资源活动中的关键作用.
- 这项工作为通过VO工程设计先进的电催化系统提供了宝贵的见解.
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