Well-dispersed Pt nanoparticles on polydopamine-coated ordered mesoporous carbons and their electrocatalytic application

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• 作者：Lijiao Yan ; Xiangjie Bo ; Dongxia Zhu ; Liping Guo
• 关键词：Ordered mesoporous carbons ; Polydopamine ; Pt nanoparticles ; Hydrogen peroxide ; Hydrazine
• 刊名：Talanta
• 出版年：March, 2014
• 年：2014
• 卷：120
• 期：Complete
• 页码：304-311
• 全文大小：1952 K

文摘

Polydopamine (PDA)-coated ordered mesoporous carbons (OMCs) are easily prepared through one-step self-polymerization of dopamine on OMCs matrix at room temperature. Pt nanoparticles (NPs) are deposited on OMCs-PDA via a simple chemical reduction. The PDA layer helps to improve the water-solubility and dispersibility of OMCs, and plays a key role in the deposition of uniform and well-distributed Pt NPs. Transmission electron microscopy images reveal that the ultra-fine Pt NPs with an average size of ~1.8 nm are well-dispersed on the surface of OMCs-PDA. The electrocatalytic behavior of OMCs-PDA/Pt modified glassy carbon (GC) electrode is investigated by cyclic voltammetry and current-time methods using hydrogen peroxide (H₂O₂) and hydrazine (N₂H₄) as redox probes. Results show that OMCs-PDA/Pt exhibits improved electrocatalytic activity towards H₂O₂ reduction and N₂H₄ oxidation compared with OMCs/Pt. The linear electro-redox responses are found for H₂O₂ and N₂H₄ in the range of 2-14324 渭M and 1-229 渭M with the detection limit (S/N=3) of 0.85 渭M and 0.51 渭M, respectively. In addition, this new nanocomposite modified electrode exhibits high sensitivity, good anti-interference ability, excellent reproducibility and long-term stability.