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通过热氧化诱导的微孔扩大,增强ZIF衍生的催化剂中的氧降解反应活性

Yu Joong Kim¹, Ki Hwan Koh², Hyeong Jun Kim¹

¹Department of Organic and Nano Engineering, Human-Tech Convergence Program, Hanyang University, Seoul 04763, Republic of Korea. than@hanyang.ac.kr.

|March 17, 2026

概括

研究人员改进了氧降解反应 (ORR) 催化剂,通过在热性伊米达酸框架 (ZIFs) 中改造孔隙结构. 控制的氧化将微孔转化为半孔,提高质量活性 (MA) 和能量转换的稳定性.

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 (MOFs),特别是热性伊米达酸框架 (ZIFs),被探索为氧降解反应 (ORR) 的非贵金属电催化剂.
由ZIF衍生的催化剂固有的微孔性阻碍了反应剂的质量传输,限制了它们的质量活性 (MA) 和能量转化系统的整体效率.

研究的目的:

开发一种新的策略来增强ZIF衍生电催化剂的质量活性 (MA).
为了克服由ZIF衍生材料微孔结构造成的质量运输限制.

主要方法:

在热解之前,对Zn,Co-ZIF前体进行了受控的热氧化预处理.
这种氧化引入了氧物种和晶格菌株,作为现场蚀刻剂,在热解过程中将微孔转化为中孔.
由此产生的催化剂被标记为Co/N-C_3.

主要成果:

氧化预处理成功将微孔转化为中孔,增加中孔体积和外表面积.
优化的Co/N-C_3催化剂实现了205.98Ag-1的卓越MA,显著超过商业Pt/C (56.24Ag-1).
催化剂表现出极好的稳定性,在48小时内保持近100%的活性.

结论:

氧化诱导孔隙工程是优化ZIF衍生电催化剂中的质量传输的关键策略.
这种方法显著提高了高性能能量转换技术的催化剂的性能和稳定性.
这些发现为在可再生能源应用中使用先进的ZIF衍生催化剂铺平了道路.

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