Green synthesis of Pt-Au dendrimer-like nanoparticles supported on polydopamine-functionalized graphene and their high performance toward 4-nitrophenol reduction
Green synthesis of Pt-Au dendrimer-like nanoparticles supported on polydopamine-functionalized graphene and their high performance toward 4-nitrophenol reduction
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DOI：
10.1016/j.apcatb.2015.08.013
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发表时间：
2016-02
影响因子：
22.1
通讯作者：
Weichun Ye;Jing Yu;Yaxin Zhou;D. Gao;Daoai Wang;Chunming Wang;D. Xue
中科院分区：
文献类型：
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作者：
Weichun Ye;Jing Yu;Yaxin Zhou;D. Gao;Daoai Wang;Chunming Wang;D. Xue
采用抗坏血酸还原H2 PtCl 6和HAuCl 4，在聚多巴胺（PDA）包裹的还原氧化石墨烯（RGO）表面合成了Pt-Au树枝状纳米粒子。详细考察了载体材料和化学组成对4-硝基苯酚（4-NP）还原催化活性的影响。与沉积在原始石墨烯片上的Pt纳米颗粒（Pt-RGO）和商业Pt/C催化剂相比，负载在PDA/RGO上的Pt纳米颗粒（Pt-PDA/RGO）表现出显著更高的催化活性。此外，化学组成严重影响催化剂的催化能力。当Pt与Au的摩尔比为3/1和1/1时，观察到显著增强的催化活性，优于用每个单一组分修饰的载体。Pt-Au-PDA/RGO催化剂的高活性可以通过两种类型的电子转移来解释：（1）从PDA涂层到Au和Pt原子的电子转移;（2）从Au到Pt原子的电子转移。此外，Pt 3Au 1-PDA/RGO复合物在六个连续的还原反应循环中保持约100%的稳定转化效率。通过“过滤-催化”实验装置，Pt 3Au 1- PDA/RGO样品对含4-NP的水表现出上级净化效率。在8秒内，水变成无色。
A facile, environmentally friendly route is demonstrated for the synthesis of Pt–Au dendrimer-like nanoparticles on the surface of polydopamine (PDA)-wrapped reduced graphene oxide (RGO), in which Pt–Au alloy nanoparticles are synthesized by the reduction of H2PtCl6and HAuCl4with ascorbic acid. The effects of support material and chemical composition on the catalytic activity for the reduction of 4-nitrophenol (4-NP) are investigated in detail. Pt nanoparticles supported on PDA/RGO (Pt-PDA/RGO) exhibit significantly higher catalytic activity as compared to those exhibited by Pt nanoparticles deposited on pristine graphene sheets (Pt-RGO) and commercial Pt/C catalyst. Furthermore, the chemical composition seriously affects the catalytic ability of the catalysts. With Pt-to-Au molar ratios of 3/1 and 1/1, significantly enhanced catalytic activities are observed, outperforming the support decorated with each single constituent. The high activity of Pt-Au-PDA/RGO can be explained by electronic effect involving in two types of electron transfers: (1) from the PDA coating to both Au and Pt atoms; (2) from Au to Pt atoms. Moreover, the Pt3Au1-PDA/RGO composite keeps a stable conversion efficiency of around 100% over six successive reduction reaction cycles. Through an experimental device of “filtering and catalyzing,” the Pt3Au1- PDA/RGO sample exhibits superior efficiency for the purification of water containing 4-NP. Within 8 s, the water becomes colorless.