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jiaxe2003鐵蟲 (小有名氣)
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[交流]
俞書宏課題組最新ACCOUNTS OF CHEMICAL RESEARCH綜述2篇 已有2人參與
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俞書宏課題組主要研究方向包括：(1) 仿生高性能納米復(fù)合結(jié)構(gòu)材料、自組裝及應(yīng)用；(2)聚合物控制晶化與模擬生物礦化；(3)多功能納米材料的模板誘導(dǎo)合成和組裝技術(shù)；(4)新型無機-有機雜化材料的制備、性能與組裝體功能；(5)面向能源、環(huán)境領(lǐng)域應(yīng)用的新型碳材料的制備和能量存儲；(6)納米材料的光、電、磁性能調(diào)控（光電和光熱轉(zhuǎn)換、光催化等）和納米催化效應(yīng)等。 Paper1 Title：Engineering Interface and Surface of Noble Metal Nanoparticle Nanotubes toward Enhanced Catalytic Activity for Fuel Cell Applications Abstract：In order for fuel cells to have commercial viability as alternative fuel sources, researchers need to develop highly active and robust fuel cell electrocatalysts. In recent years, the focus has been on the design and synthesis of novel catalytic materials with controlled interface and surface structures. Another goal is to uncover potential catalytic activity and selectivity, as well as understand their fundamental catalytic mechanisms. Scientists have achieved great progress in the experimental and theoretical investigation due to the urgent demand for broad commercialization of fuel cells in automotive applications. However, there are still three main problems: cost, performance, and stability. To meet these targets, the catalyst needs to have multisynergic functions. In addition, the composition and structure changes of the catalysts during the reactions still need to be explored. Activity in catalytic nanomaterials is generally controlled by the size, shape, composition, and interface and surface engineering. As such, one-dimensional nanostructures such as nanowires and nanotubes are of special interest. However, these structures tend to lose the nanoparticle morphology and inhibit the use of catalysts in both fuel cell anodes and cathodes. In 2003, Rubinstein and co-workers proposed the idea of nanoparticle nanotubes (NNs), which combine the geometry of nanotubes and the morphology of nanoparticles. This concept gives both the high surface-to-volume ratio and the size effect, which are both appealing in electrocatalyst design. In this Account, we describe our developments in the construction of highly active NNs with unique surface and heterogeneous interface structures. We try to clarify enhanced activity and stability in catalytic systems by taking into account the activity impact factors. We briefly introduce material structural effects on the electrocatalytic reactivity including metal oxide/metal and metal/metal interfaces, dealloyed pure Pt, and mixed Pt/Pd surfaces. In addition, we discuss the geometric structure and surface composition changes and evolutions on the activity, selectivity, and stability under fuel cell operation conditions. We expect that these nanostructured materials with particular nanostructured characteristics, physical and chemical properties, and remarkable structure changes will offer new opportunities for wide scientific communities. Paper2 Title：Multiplex Templating Process in One-Dimensional Nanoscale: Controllable Synthesis, Macroscopic Assemblies, and Applications Abstract:：Since their detection 20 years ago, carbon nanotubes (CNTs) have captured the interest of scientists, because one-dimensional (1D) nanostructures (nanowires, nanotubes, and nanoribbons) have fascinating physical properties and many potential technological applications. These are materials with structural features limited to the range of 1100 nm in one dimension, and unlimited in the others. When their size goes down to certain characteristic lengths, such as the Bohr radius, the wavelength of incandescent light, and the phonon mean-free path, quantum mechanical effects can occur. This results in novel optical, magnetic, and electronic characteristics. These physical properties, along with unique transport features in the longitudinal direction and large surface-to-volume ratio, make 1D nanostructures attract extensive attention in both fundamental research and engineering applications. From a synthetic point of view, it is highly desirable to develop a simple route for fabricating 1D nanostructures in large scale at low cost. On the other hand, in order to transfer the intrinsic features of individual 1D nanostructures into macroscopic scale and realize practical applications, we need to explore highly efficient and scalable assembly methods to integrate 1D nanostructures into functional macroscopic architectures. In 2006, our group developed a simple hydrothermal method for synthesizing ultrathin Te nanowires (TeNWs) using conventional chemicals. As we found through systematic study over the past several years, we can use the ultrathin TeNWs as a versatile templating material to fabricate a series of high-quality 1D nanostructures by taking the unique advantages of TeNWs, such as large-scale synthesis, high processability, and high reactivity. The obtained 1D products inherit the dimensional (high aspect ratio) andmechanical (high flexibility) features of the originalTeNW templates, thus allowing us to constructmacroscopic architectures by using them as nanoscale building blocks. In this Account, we describe on our recent developments in the multiplex templating synthesis of 1D nanostructures, their macroscopic assemblies, and applications. We first introduce ultrathin TeNWs and their advantages as a templating material. Through the multiplex templating process, we can prepare a family of 1D nanostructures that covers a wide range of materials, including noble metals, metal oxides, semiconductors, carbon, polymers, and their binary and multiple hybrids.We emphasize the reactivity of templating materials and the versatility of templating processes in this Account. On the basis of the templated 1D products, we then describe a series of macroscopic assemblies of 1D nanostructures, including free-standing membranes, films, hydrogels, and aerogels. These exhibit enormous potential for attractive applications, such as liquid filtration and separation, continuous-flow catalysis, electrocatalysis, polymer-based nanocomposites, and superadsorbents, and elastomeric conductors.We believe that the great versatility of templating synthesis, a scalable assembling process, and large-scale synthesis can significantly enhance the application reliability of the 1D nanostructures. 1.gif 2.gif [ Last edited by jiaxe2003 on 2013-3-8 at 01:11 ] |
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2013-03-05 21:20:30, 2.36 M
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4樓2015-06-25 06:55:15
jiaxe2003
鐵蟲 (小有名氣)
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3樓2013-03-09 19:08:51
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