Hydrogen production with ultrahigh efficiency under visible light by graphene well-wrapped UiO-66-NH2 octahedrons
Hydrogen production with ultrahigh efficiency under visible light by graphene well-wrapped UiO-66-NH2 octahedrons
复制标题
石墨烯包裹良好的UiO-66-NH2八面体在可见光下超高效率制氢
DOI：
10.1039/c7ta06341e
复制
发表时间：
2017-10-14
影响因子：
11.9
通讯作者：
Liu, Bo
中科院分区：
文献类型：
--
作者：
Wang, Yang;Yu, Yu;Liu, Bo
一种高效的催化体系和表面改性被视为提高基于金属 - 有机框架（MOF）的光催化性能的两条重要途径。在此，我们报道了通过上述两种途径实现的MOF在制氢效率方面的显著提高。利用新开发的高效三乙醇胺 - 铒（TEOA - ErB）体系，在氨基修饰的UiO - 66八面体上的氢气生成速率可达到21.2毫摩尔每小时每克。然后，在此体系基础上，巧妙地控制了UiO - 66 - NH₂表面与石墨烯的相互作用。所制备的被石墨烯良好包裹的UiO - 66 - NH₂八面体，其每个面都与石墨烯接触，使得氢气生成效率最高达到41.4毫摩尔每小时每克。这些发现表明，当MOF被纳入合适的体系时，有可能发展成为高效的光催化剂，并且进一步揭示了对MOF表面进行改性可能会更好地抑制制氢过程中的电子 - 空穴复合。
An efficient catalytic system and surface modification are considered as two important routes for the enhancement of MOF-based photocatalytic properties. Herein, we report a significant improvement in hydrogen production efficiency with MOFs achieved through both the abovementioned routes. With the newly developed highly efficient TEOA–ErB system, H2 generation rate on UiO-66-NH2 octahedrons could amount to 21.2 mmol h−1 g−1. Then, based on this system, the interaction of the UiO-66-NH2 surface with graphene was judiciously controlled. The prepared graphene well-wrapped UiO-66-NH2 octahedrons, in which every face was in contact with graphene, led to the highest H2 production efficiency of 41.4 mmol h−1 g−1. These findings suggest that MOFs could potentially evolve into highly efficient photocatalysts when incorporated into a proper system and further revealed that modifications on the surface of MOFs might result in a better inhibition of electron–hole recombination in H2 generation.