在MOF-74中构建NiCo/Fe3O4异质粒子以实现高效的氧进化反应
Xiaolu Wang1, Hai Xiao1, Ang Li2
1Department of Chemistry , Tsinghua University , Beijing 100084 , China.
Journal of the American Chemical Society
|October 25, 2018
概括
研究人员为高效的氧化演化反应 (OER) 创造了新的金属有机框架 (MOF) 衍生物. 这种新材料,NiCo/Fe3O4/MOF-74,表现出极好的稳定性和较低的OER催化潜力.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 金属有机框架 (MOF) 越来越多地被用作高级功能材料的前体.
- 氧化演化反应 (OER) 对能量转化技术至关重要,但需要高效和稳定的电催化剂.
研究的目的:
- 开发一种可控的部分热解策略,用于制造具有增强OER性能的MOF衍生物.
- 研究MOF-74中嵌入的NiCo/Fe3O4异构粒子的结构和催化特性.
主要方法:
- 使用三金属NiCoFe-MOF-74作为受控部分热解的前体.
- 在MOF-74框架内制造的NiCo/Fe3O4异构粒子.
- 描述了材料的结构,并通过电化学评估其OER性能.
- 进行密度函数理论 (DFT) 计算以了解催化机制.
主要成果:
- 合成的NiCo/Fe3O4/MOF-74表现出显著的OER活性,在10.0 mA cm-2时具有238 mV的低超电位,以及29 mV/dec的Tafel斜率.
- 部分热解保存了MOF框架,促进了基质扩散和纳米粒子形成.
- 与原始MOF和完全分解的衍生物相比,该材料表现出更高的稳定性.
- DFT的计算表明,NiCo通过稳定活性氧物种来增强Fe3O4的OER活性.
结论:
- 控制的NiCoFe-MOF-74部分热解是一种有效的策略,用于创建强大的NiCo/Fe3O4/MOF-74异构结构,以获得高效的OER.
- 和Fe3O4之间独特的纳米结构和协同效应有助于增强催化性能.
- 这种MOF衍生电催化剂在水分和其他能量转换系统中的应用具有显著的前景.
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