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Controlled Synthesis and Multifunctional Properties of FePt-Au Heterostructures

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Nano Research 2011年第9期4卷 836-848页

作者： Jiajia Wu Yanglong Hou Song Gao Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications Collegeof Chemistry and Molecular Engineering Beijing 100871 China department of advanced materials and nanotechnology College of Engineering Peking University Beijing 100871 China

In this work FePt-Au heterostructured nanocrystals （HNCs） such as tadpole-, dumbbell-, bead-, and necklace-like nanostructures were synthesized by a facile heteroepitaxial growth of Au NCs onto FePt nanorods （NRs）. A study of the growth mechanism revealed that the morphology control of the final products can be correlated with the adsorption sites of hydrogen onto the FePt NRs, which can be manipulated by the amount of the forming gas （At/7% H2） added. Not only the optical characteristic and magnetic properties of the intrinsic materials were retained in the products, but also the FePt-Au HNCs showed the tunable multifunctional properties resulted from the interactions between Au and FePt. Moreover, for methanol oxidation, the FePt-Au HNCs exhibited enhanced catalytic activity and CO tolerance on the catalyst surface compared to commercial Pt catalysts. It is worth noting that as multifunctional units, the FePt-Au HNCs also possess a heterogeneous surface, which could potentially enable their site-specific functionalization for targeting or imaging purposes in biomedical applications. More interestingly, the catalytic properties of the FePt-Au HNCs also endow this material with application potentials in nanocatalysis.

关键词： Heterostructure heteroepitaxy multifunctionality magnetism nanocatalysis

Palladium Nanoparticles Loaded on Carbon Modified TiO_2 Nanobelts for Enhanced Methanol Electrooxidation

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Nano-Micro Letters 2013年第3期5卷 202-212页

作者： Robert Liang Anming Hu John Persic Y.Norman Zhou centre for advanced materials Joining Department of Mechanical and Mechatronics Engineering University of Waterloo 200 University Waterloo Institute for nanotechnology University of Waterloo 200 University Microbonds Inc.

Carbon modified TiO_2 nanobelts(TiO_2-C) were synthesized using a hydrothermal growth method,as a support material for palladium(Pd) nanoparticles(Pd/TiO_2-C) to improve the electrocatalytic performance for methanol electrooxidation by comparison to Pd nanoparticles on bare TiO_2 nanobelts(Pd/TiO_2)and activated carbon(Pd/AC). Cyclic voltammetry characterization was conducted with respect to saturated calomel electrode(SCE) in an alkaline methanol solution, and the results indicate that the specific activity of Pd/TiO_2-C is 2.2 times that of Pd/AC and 1.5 times that of Pd/TiO_2. Chronoamperometry results revealed that the TiO_2-C support was comparable in stability to activated carbon, but possesses an enhanced current density for methanol oxidation at a potential of -0.2 V vs. SCE. The current study demonstrates the potential of Pd nanoparticle loaded on hierarchical TiO_2-C nanobelts for electrocatalytic applications such as fuel cells and batteries.

关键词： Titanium oxide nanobelts Carbon-modification Fuel cell Methanol electrooxidation Palladium nanoparticles Electrocatalysts

A novel dual-functional layer exhibiting exceptional protection and photocatalytic activity by organic functionalization of plasma electrolyzed layer

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Journal of Magnesium and Alloys 2023年第4期11卷 1247-1263页

作者： Mosab Kaseem Tehseen Zehra Burak Dikici Ali Dafali Arash Fattah-alhosseini department of nanotechnology and advanced materials Engineering Sejong UniversitySeoul 05006Republic of Korea department of Metallurgical and materials Engineering Ataturk UniversityErzurum 25240Turkey department of chemistry Faculty of Sciences OujdaMohamed the First UniversityOujdaMorocco department of materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

The formation of inorganic-organic hybrids(IOH)on the metallic substrates would play a decisive role in improving their structural and functional *** this work,the growth of organic coating(OC)consisting of coumarin-3-carboxylic acid(3-CCA)and albumin(ALB)on the inorganic layer(IC),produced by plasma electrolysis of AZ31 Mg alloy,led to enabling organically synergistic reactions on the porous inorganic surface,forming a flake-like structure sealing the structural defects of *** actions between OC and IC endow the flake-like structures with chemical protection and photocatalytic *** contact with a corrosive solution,the IOH layer possesses stable morphologies that delay the corrosive degradation of the whole *** electrochemical stability of the sample produced by immersion IC in the organic solution for 10 h(IOH2 sample)was superior to the other samples as it had the lowest corrosion current density(1.69×10^(−10)A·cm^(−2))and the highest top layer resistance(1.2×10^(7)Ω·cm^(2)).Moreover,the IOH layer can photodegrade the organic pollutants in model wastewater,where the highest photocatalytic efficiency of 99.47%was found in the IOH2 ***,computational calculations were performed to assess the relative activity of different parts of the ALB and 3-CCA structures,which provide helpful information into the formation mechanism of the IOH materials.

关键词： Functional layer PE Albumin Coumarin Porous layer Corrosion Photocatalyst

Self-assembly of coumarin molecules on plasma electrolyzed layer for optimizing the electrochemical performance of AZ31 Mg alloy

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Journal of Magnesium and Alloys 2023年第5期11卷 1618-1628页

作者： Mosab Kaseem Burak Dikici Ali Dafali Arash Fattah-alhosseini department of nanotechnology and advanced materials Engineering Sejong UniversitySeoul 05006Republic of Korea department of Metallurgical and materials Engineering Ataturk UniversityErzurum 25240Turkey Faculty of Sciences Oujda Department of ChemistryMohamed the First UniversityOujdaMorocco department of materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

A novel inorganic-organic layer with outstanding corrosion resistance in a 3.5wt.% NaCl solution was fabricated by taking advantage of the unique interactions between coumarin (COM) molecules and the porous layer formed on Mg alloy. To achieve this aim, the AZ31 Mg alloy coated via microarc oxidation (MAO) coating was placed in an ethanolic solution of COM for 6 and 12 h at 25 ℃. By reducing the surface area exposed to the corrosive species, the donor-acceptor complexes produced by the particular interactions between the COM and MAO surface would successfully prevent the corrosion of Mg alloy substrate. The MAO layer would provide the ideal sites for the charge-transfer-induced physical and chemical locking, leading to uneven organic layer nucleation and crystal growth with a thatch-like structure. To evaluate the formation mechanism of such hybrid composites and highlight the key bonding modes between the COM and MAO, theoretical simulations were conducted.

关键词： Mg alloy Hybrid coating Coumarin Porous layer Corrosion DFT

Charge balance materials for homojunction and heterojunction OLED applications

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Frontiers of Optoelectronics 2009年第4期2卷 435-441页

作者： Louis M.LEUNG Yik-Chung LAW Michael Y.WONG Tik-Ho LEE Kin Ming LAI Lok-Yee TANG department of chemistry and centre for advanced Luminescence materials Hong Kong Baptist University

In a homojunction device, a single organic layer assumes the multiple roles of hole, electron transportation, and emitter. Its ease in processing is highly desirable from the manufacturing point of view. In this paper, we shall describe the synthesis of a range of bipolar small molecules and conductive vinyl polymers for application in homojunction and heterojunction organic light emitting diodes（OLEDs）. The bipolar materials, in general, consist of three basic building blocks: an arylamine, a 1,3,4-oxadiazole, and a polycyclic aromatic moiety. The achievement of charge balance can be validated either by direct measurement of electron/hole mobility or indirectly via optimization of device properties.A series of conductive vinyl copolymers containing hole transporting N-（4-methoxyphenyl）-N-（4-vinylphenyl）naphthalen-1-amine（4MeONPA） and electron transporting 2-phenyl-5-（4-vinylphenyl）-1,3,4-oxadiazole（OXA）at different compositions was applied for heterojunction and homojunction OLEDs. For heterojunction devices employed the copolymers as the hole transporting layer and Alq3as the electron transporting and emitting layer,a maximum luminance and current efficiency of over 23000 cd/m2and 4.2 cd/A（PL of Alq3）, respectively, were achieved at the charge balance composition. Homojunction devices for the copolymers were demonstrated by the addition of rubrene as a dopant. The single layer devices at the optimal copolymer composition has ca 1500 cd/m2and 0.74 cd/A.

关键词： homojunction devices charge balance bipolar small molecules conductive vinyl copolymers

Electrochemical performance of all-solid lithium ion batteries with a polyaniline film cathode

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Journal of Energy chemistry 2016年第1期25卷 93-100页

作者： Ji-Woo Oh Rye-Gyeong Oh Yongku Kang Kwang-Sun Ryu department of chemistry University of Ulsan advanced materials Divisions Korea Research Institute of Chemical Technology

We have prepared a high-density polyaniline（PANI） paste（50 mg/m L）, with similar physical properties to those of paints or pigments. The synthesis of PANI is confirmed by Fourier transform infrared（FT-IR） spectroscopy. The morphologies of PANI, doped PANI, and doped PANI paste are confirmed by scanning electron microscopy（SEM）. Particles of doped PANI paste are approximately 40–50 nm in diameter, with a uniform and cubic shape. The electrochemical performances of doped PANI paste using both liquid and solid polymer electrolytes have been measured by galvanostatic charge and discharge process. The cell fabricated with doped PANI paste and the solid polymer electrolyte exhibits a discharge capacity of ～87 μAh/cm2（64.0 m Ah/g） at the second cycle and～67 μAh/cm2（50.1 m Ah/g） at the 100 th cycle.

关键词： Lithium ion batteries Cathode Conducting polymer Polyaniline Flexible battery

Novel Chromogenic Chemosensors for Fluoride Anion Based on 8-Hydroxyquinoline Azo Derivatives

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Chinese Journal of chemistry 2007年第5期25卷 616-622页

作者：成云飞刘志强石梅赵强李富友易涛黄春辉 department of chemistry and Laboratory of advanced materials Fudan University Shanghai 200433 China

A series of 8-hydroxyquinoline azo derivatives with diverse conjugated structures were synthesized and studied to chromogenicaUy detect anions. All the dyes allowed selective detection for fluoride anion in CH3CN via instant deprotonation of the compounds, which was affirmed by UV-Vis absorption and 1H NMR spectra. The chromogenically responding ability increases as the substituent changes from phenyl to naphthyl or anthryl. This result is likely to be related to the enhancement of intramolecular charge transfer （ICT） induced by extension of conjugated structure.

关键词： 8-hydroxyquinoline azo derivative anion chromogenic sensor

Controlled fabrication and microwave absorbing mechanism of hollow Fe3O4@C microspheres

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Science China chemistry 2017年第6期60卷 740-747页

作者： Yanhui Hou Huili Yuan Hang Chen Junhai Shen Liangchao Li Key Laboratory of the Ministry of Education for advanced Catalysis materials Department of Chemistry Zhejiang Normal University

Uniform core-shell SiO2@Fe_3O_4@C microspheres were prepared by a one-step hydrothermal method with SiO_2 microspheres as the template, and the hollow Fe_3O_4@C(HFC) microspheres were achieved via etching SiO_2 template. By changing the sizes of SiO_2 microspheres, a series of HFC microspheres with variable cavity sizes were obtained to study the relationship between cavity size and microwave absorbing(MA) performance for the first time. The morphology and structure of samples were characterized in detail. The results showed that the MA performance of HFC sample depended on its cavity size. In particular, the hollow structure was good for improving MA performance and could make MA move to the high-frequency region. More importantly, as the cavity size increases, the resonance frequency of HFC-i(i=1,2, 3, 4) samples moved to a low frequency, and the optimal matching thickness of HFC-i samples was increasing. Among all HFC-i samples, HFC-3 showed the most excellent MA performance,which could be mainly explained by the quarter-wavelength matching model, intrinsical magnetic and dielectric loss. Furthermore,the MA performance of HFC mixture blended by the equal mass fraction of HFC-2, HFC-3 and HFC-4 was the comprehensive results of three HFC-i samples. All the above suggested that the cavity size in HFC sample had a great influence on the MA performance.

关键词： microwave absorbing Fe_3O_4@C cavity size

Recent Progress in Polyanionic Anode materials for Li(Na)‑Ion Batteries

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Electrochemical Energy Reviews 2021年第3期4卷 447-472页

作者： Yao Liu Wei Li Yongyao Xia department of chemistry Laboratory of Advanced MaterialsFudan UniversityShanghai 200433China

In recent years,rechargeable lithium-ion batteries(LIBs)have become widely used in everyday applications such as portable electronic devices,electric vehicles and energy storage *** this,the electrochemical performance of LIBs cannot meet the energy demands of rapidly growing technological *** although significant progress has been made in the development of corresponding anodes based primarily on carbon,oxide and silicon materials,these materials still possess shortcomings in current LIB *** example,graphite exhibits safety concerns due to an operating potential close to that of lithium(Li)metal plating whereas Li4Ti5O12 possesses low energy density for high operation potential and silicon experiences limited cyclability for large volume expansion during charging/***,polyanionic compounds such as(PO_(4))^(3–),(SiO_(4))^(4–),(SO_(4))^(2–)and(BO_(3))^(3−)as electrode materials have gained increasing attention in recent years due to their ability to stabilize structures,adjust redox couples and provide migration channels for"guest"ions,resulting in corresponding electrode materials with long-term cycling,high energy density and outstanding rate *** on these advantages and combined with recent findings in terms of silicate anodes,this review will summarize the recent progress in the development of polyanion-based anode materials for LIBs and sodium-ion ***,this review will present our latest research based on polyanion groups such as(GeO_(4))^(4–)to compensate for the lack of available studies and to provide our perspective on these materials.

关键词： Lithium-ion battery Sodium-ion battery Anode Polyanionic materials