Zhang Suling, Lu Yanhong, Wan Xingchen, Duan Yaxin, Gao Junlin, Ge Zhen, Wei Lei, Chen Yu, Ma Yanfeng, Chen Yongsheng
School of Chemistry & Material Science, Langfang Normal University Langfang 065000 China
The Centre of Nanoscale Science and Technology, Key Laboratory of Functional Polymer Materials, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
RSC Adv. 2020 Nov 18;10(69):42054-42061. doi: 10.1039/d0ra07146c. eCollection 2020 Nov 17.
High dispersibility and rapid electron transfer are required for a highly efficient catalyst. In this work, such materials have been designed using a scalable hydrothermal method from graphene oxide and a metal-organic framework. A cross-linked three-dimensional graphene (3DGraphene) material loaded with mono-dispersed nitrogen-doped carbon-coated metallic Co (NC@Co) nanoparticles with uniform size of 12.2 nm (3DGraphene/NC@Co) has been obtained and exhibits excellent activity for catalytic reduction of 4-nitrophenol to 4-aminophenol. Such high catalytic activity can be assigned to the highly energetic hot/free electrons arising from 3DGraphene under light illumination and the synergistic effect between 3DGraphene and NC@Co nanoparticles. The catalytic reaction can be finished in 240 s with NaBH as the reducing agent, and the corresponding rate constant () is 1.5 × 10 s, comparable to that of reported noble metal catalysts. Furthermore, the magnetic 3DGraphene/NC@Co materials are beneficial for the separation from the mixture after reaction and exhibit excellent cycling stability.
高效催化剂需要具有高分散性和快速电子转移能力。在这项工作中，通过一种可扩展的水热法，以氧化石墨烯和金属有机框架为原料设计出了此类材料。制备出了一种负载有尺寸均匀为12.2 nm的单分散氮掺杂碳包覆金属钴（NC@Co）纳米颗粒的交联三维石墨烯（3DGraphene）材料（3DGraphene/NC@Co），该材料对将4-硝基苯酚催化还原为4-氨基苯酚表现出优异的活性。这种高催化活性可归因于光照下3DGraphene产生的高能热/自由电子以及3DGraphene与NC@Co纳米颗粒之间的协同效应。以硼氢化钠为还原剂时，催化反应可在240 s内完成，相应的速率常数（）为1.5×10 s，与已报道的贵金属催化剂相当。此外，磁性的3DGraphene/NC@Co材料有利于反应后从混合物中分离出来，并表现出优异的循环稳定性。
