[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Titanium Dioxide Nanomaterials: Synthesis, Properties, Modifications, and Applications

Polydopamine and Its Derivative Materials: Synthesis and Promising Applications in Energy, Environmental, and Biomedical Fields

The recent advances in electrocatalysis for oxygen reduction reaction (ORR) for proton exchange membrane fuel cells (PEMFCs) are thoroughly reviewed. This comprehensive Review focuses on the low- and non-platinum electrocatalysts including advanced platinum alloys, core–shell structures, palladium-based catalysts, metal oxides and chalcogenides, carbon-based non-noble metal catalysts, and metal-free catalysts. The recent development of ORR electrocatalysts with novel structures and compositions is highlighted. The understandings of the correlation between the activity and the shape, size, composition, and synthesis method are summarized. For the carbon-based materials, their performance and stability in fuel cells and comparisons with those of platinum are documented. The research directions as well as perspectives on the further development of more active and less expensive electrocatalysts are provided.

http://repository.ust.hk/ir/bitstream/1783.1-77094/1/acs.chemrev.5b00462_withlink.pdf

Recent Advances in Electrocatalysts for Oxygen Reduction Reaction

TiO(2) is one of the most studied compounds in materials science. Owing to some outstanding properties it is used for instance in photocatalysis, dye-sensitized solar cells, and biomedical devices. In 1999, first reports showed the feasibility to grow highly ordered arrays of TiO(2) nanotubes by a simple but optimized electrochemical anodization of a titanium metal sheet. This finding stimulated intense research activities that focused on growth, modification, properties, and applications of these one-dimensional nanostructures. This review attempts to cover all these aspects, including underlying principles and key functional features of TiO(2), in a comprehensive way and also indicates potential future directions of the field.

TiO2 nanotubes: synthesis and applications.

A Low Strain A-Site Deficient Perovskite Lithium Lanthanum Niobate Anode for Superior Li+ Storage

Encapsulation of a Cu core into a ZnO shell has been rarely reported by a one-pot method, which is expected to be a novel combination of a reflection core and a dielectric microwave absorber. Here, a facile one-pot strategy has been developed for assembling Cu/ZnO core/shell nanocomposites with different sizes and aspect ratios. The temperature acts as the switch for starting ZnO encapsulation in this strategy, and the sizes and aspect ratios of the resultant nanocomposites depend sensitively on the heating rate in 220–250 °C. The different morphologies and structures of the nanocomposites have been characterized comprehensively, and the relevant growth mechanism is also discussed in this paper. The microwave absorption performances in both as-synthesized Cu@ZnO products (spherical-like and rod-like shapes) are significantly enhanced by comparing with that of pure ZnO due to the enhanced interfacial scattering and dielectric interface polarization in the ZnO shell. This one-pot method can complement for rational methodology in constructing metal/semiconductor core/shell nanocomposites.

Dual-ligand mediated one-pot self-assembly of Cu/ZnO core/shell structures for enhanced microwave absorption

The coercivity mechanism of Sm 2 Co 17 -type magnet has been studied for a long time, it is generally acceptaed that domain wall pinning by the SmCo 5 cell boundary phase is the origin of large coercivity of this kind of magnet. Several works pointed out that Cu distribution around the cell boundary phase is the reason for domain wall pinning [1][2]. However, there still exists argument in whether the pinning type is attractive or repulse, whether pinning center lies in the center of SmCo 5 phase or the interface between SmCo 5 and Sm 2 Co 17 phases, and especially in the interpretation of positive temperature coefficient of coercivity of magnet quenched at different temperature. The motivation of this work is to make deep understanding of pining mechanism of Sm 2 Co 17 -type magnet by dynamic observation of domain wall motion using high resolution Lorentz transmission electron microscopy (TEM).

In Situ Observation of Domain Wall Pinning in Sm(Co,Fe,Cu,Zr) z Magnet by Lorentz Microscopy

Engineering polarization surface of hierarchical ZnO microspheres via spray-annealing strategy for wide-frequency electromagnetic wave absorption

Structurally well-defined assemblies of silver nanoparticles, including the dendritic nano-flowers (NFs), planar nano-spheres (NSs) and nano-dendrites (NDs) were obtained by a surfactant-free and ultrafast (≈15min) self-assembly process on as-purchased carbon-coated copper TEM grids. The silver nano-assemblies, especially the NFs modified TEM grids, when serving as surface-enhanced Raman spectroscopy (SERS) substrates for detecting melamine molecules, demonstrated a long-lived limit of detection (LOD) of as low as 10-11M, suggesting the potential of these silver-assemblies modified carbon-coated copper grids as novel potable and cost-effective SERS substrates for trace detection toward various food contaminants like melamine.

Renchao Che

Papers

A Low Strain A-Site Deficient Perovskite Lithium Lanthanum Niobate Anode for Superior Li+ Storage

Dual-ligand mediated one-pot self-assembly of Cu/ZnO core/shell structures for enhanced microwave absorption

In Situ Observation of Domain Wall Pinning in Sm(Co,Fe,Cu,Zr) z Magnet by Lorentz Microscopy

Engineering polarization surface of hierarchical ZnO microspheres via spray-annealing strategy for wide-frequency electromagnetic wave absorption

Ultrafast self-assembly of silver nanostructures on carbon-coated copper grids for surface-enhanced Raman scattering detection of trace melamine.