Synthesis of MOF‐525 Derived Nanoporous Carbons with Different Particle Sizes for Supercapacitor Application

Nanoporous carbon (NC) materials have attracted great research interest for supercapacitor applications, because of their excellent electrochemical and mechanical stability, good electrical conductivity, and high surface area. Although there are many reports on metal–organic framework (MOF)‐derived carbon materials, previous synthetic studies have been hindered by imperfect control of particle sizes and shapes. Here, we show precise control of the particle sizes of MOF‐525 from 100 nm to 750 nm. After conversion of MOF‐525 to NC, the effects of variation of the particle size on the electrochemical performance have been carefully investigated. The results demonstrate that our NC is a potential candidate for practical supercapacitor applications.     

MOF-74及其复合物:多样合成与广泛应用

MOF-74具有高密度裸露的金属位点、可调的一维孔道及高热稳定性等优点,引起了科研工作者的广泛关注与深入探索。本综述主要从以下三个方面对MOF-74的发展状况进行概括:(1)着重介绍了MOF-74及其异构体的结构及组装方法(溶剂热法、常温法、微波辅助法、干凝胶法等),此外还讨论了反应溶剂、辅助配体、调节剂等因素对目标化合物的影响;(2)考虑到复合材料之间的协同作用,还对MOF-74基复合材料的发展现状进行概括,包括材料的构筑类型及典型的合成方法;(3)进一步讨论了MOF-74具有的特殊属性如孔道性、路易斯酸碱位点、结构稳定性以及复合材料的协同性能,以及MOF-74基材料在催化、分离、检测、吸附、能量储存等各个领域广泛的应用前景。最后还对新型MOF-74异构体材料的构建提出了合理的想法。     

Tuning the Properties of MOF-808 via Defect Engineering and Metal Nanoparticle Encapsulation

Defect engineering and metal encapsulation are considered as valuable approaches to fine-tune the reactivity of metal–organic frameworks. In this work, various MOF-808 (Zr) samples are synthesized and characterized with the final aim to understand how defects and/or platinum nanoparticle encapsulation act on the intrinsic and reactive properties of these MOFs. The reactivity of the pristine, defective and Pt encapsulated MOF-808 is quantified with water adsorption and CO₂ adsorption calorimetry. The results reveal strong competitive effects between crystal morphology and missing linker defects which in turn affect the crystal morphology, porosity, stability, and reactivity. In spite of leading to a loss in porosity, the introduction of defects (missing linkers or Pt nanoparticles) is beneficial to the stability of the MOF-808 towards water and could also be advantageously used to tune adsorption properties of this MOF family.     

MOF-808/Bi2MoO6复合材料的构筑及其光催化性能

采用简单的两步水热法制备出了锆基金属有机骨架和钼酸铋的复合材料MOF-808/Bi₂MoO₆。通过X射线粉末衍射、傅里叶红外光谱、扫描电子显微镜、透射电子显微镜、X射线光电子能谱、紫外可见漫反射光谱、N₂吸附-脱附测试和电化学测试对所制备材料的组成、微观结构、光学性质以及光生载流子的复合效率进行了分析。与纯Bi₂MoO₆和MOF-808相比,0.5%-MOF-808/Bi₂MoO₆复合材料展示出了较高的光催化活性,在可见光照射120 min时对抗生素环丙沙星(CIP)的降解率达89.7%。通过自由基捕获实验,证明了·O₂^-是主要活性物种,基于此我们提出了可能的光催化降解机理。