Anchoring noble metal nanoparticles on CeO2 modified reduced graphene oxide nanosheets and their enhanced catalytic properties
Anchoring noble metal nanoparticles on CeO2 modified reduced graphene oxide nanosheets and their enhanced catalytic properties
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CeO2改性还原氧化石墨烯纳米片上锚定贵金属纳米粒子及其增强的催化性能
DOI：
10.1016/j.jcis.2014.06.045
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发表时间：
2014-10-15
影响因子：
9.9
通讯作者：
Chen, Kangmin
中科院分区：
文献类型：
--
作者：
Ji, Zhenyuan;Shen, Xiaoping;Chen, Kangmin
在结构上整合贵金属、金属氧化物和石墨烯的策略有望为石墨烯基纳米复合材料的新兴功能提供巨大的机会。在这项研究中，我们开发了一个简单的两步法分散贵金属（Pt和Au）纳米粒子的表面CeO 2功能化的还原氧化石墨烯（RGO）纳米片。结果表明，Pt和Au颗粒尺寸分别为5 nm和2 nm，在RGO/CeO 2表面分散良好。以NaBH 4还原4-硝基苯酚（4-NP）制备4-氨基苯酚（4-AP）为模型反应，对所制备的RGO/Pt/CeO 2和RGO/Au/CeO 2三元纳米复合材料的催化性能进行了定量评价。在这样的三组分催化剂中，CeO 2纳米晶体为优化贵金属Pt和Au的催化性能提供了独特和关键的作用，使它们与RGO/Pt和RGO/Au催化剂相比表现出增强的催化活性。此外，对RGO/Pt/CeO 2和RGO/Au/CeO 2三元催化剂在4-NP还原反应中的催化活性增强机理进行了探讨.我们制备的石墨烯基三组分复合材料继承了石墨烯、金属氧化物和贵金属的独特性质，有望成为催化和其他应用的有吸引力的候选者。(C)2014 Elsevier Inc. All rights reserved.
The strategy of structurally integrating noble metal, metal oxide, and graphene is expected to offer prodigious opportunities toward emerging functions of graphene-based nanocomposites. In this study, we develop a facile two-step approach to disperse noble metal (Pt and Au) nanoparticles on the surface of CeO2 functionalized reduced graphene oxide (RGO) nanosheets. It is shown that Pt and Au with particle sizes of about 5 and 2 nm are well dispersed on the surface of RGO/CeO2. The reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH4 was used as a model reaction to quantitatively evaluate the catalytic properties of the as-synthesized RGO/Pt/CeO2 and RGO/Au/CeO2 ternary nanocomposites. In such triple-component catalysts, CeO2 nanocrystals provide unique and critical roles for optimizing the catalytic performance of noble metallic Pt and Au, allowing them to express enhanced catalytic activities in comparison with RGO/Pt and RGO/Au catalysts. In addition, a possible mechanism for the enhanced catalytic activities of the RGO/Pt/CeO2 and RGO/Au/CeO2 ternary catalysts in the reduction of 4-NP is proposed. It is expected that our prepared graphene-based triple-component composites, which inherit peculiar properties of graphene, metal oxide, and noble metal, are attractive candidates for catalysis and other applications. (C) 2014 Elsevier Inc. All rights reserved.