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首页> 外文期刊>RSC Advances >Hot electron prompted highly efficient photocatalysis based on 3D graphene/non-precious metal nanoparticles
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Hot electron prompted highly efficient photocatalysis based on 3D graphene/non-precious metal nanoparticles

机译：基于3D石墨烯/非贵金属纳米粒子的热电子促进高效的光催化

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摘要

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 _(4) as the reducing agent, and the corresponding rate constant ( k ) is 1.5 × 10 ~(?2) s ~(?1) , 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.
机译：高效催化剂需要高分散性和快速电子传递。在这项工作中，已经使用来自石墨烯和金属有机框架的可伸缩水热法设计了这种材料。已经获得了用单分散的氮掺杂碳涂覆的金属CO（NC×CO）均匀尺寸为12.2nm（330nc / Co）的单分散的氮掺杂碳涂层金属Co（NC×CO）材料（3D）的交联的三维石墨烯（3D）材料。催化还原4-硝基苯酚至4-氨基酚的活性。可以将这种高催化活性分配给在光照中从35℃产生的高度高能的热/自由电子以及3DValkene和NC @ Co纳米颗粒之间的协同效应。催化反应可以用NaBH _（4）作为还原剂以240s完成，并且相应的速率常数（k）为1.5×10〜（Δ2）S〜（？1），与报告的贵族相当金属催化剂。此外，磁性35Graphene / NC @ Co材料有利于反应后与混合物分离，表现出优异的循环稳定性。

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