다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

The demand for flexible power sources with high energy density and durability has increased rapidly with the development of flexible and wearable electronic devices. Metal–air batteries are considered as the most promising candidates for these applications due to their excellent theoretical energy densities. In particular, rechargeable zinc–air and lithium–air batteries have attracted much attention because of their potential to offer high energy density while maintaining a long operational life. Although significant progress has been made in enhancing the electrochemical performance of these batteries, many technical challenges still remain to achieve the mechanical flexibility required for wearable electronic devices while maintaining high performance. This article describes the most recent advances and challenges in the development of flexible zinc–air and lithium–air batteries. We start with an overview of the latest innovations in the exploration of various battery configurations to effectively accommodate stresses and strains associated with the use of flexible electronic devices. This is followed by a detailed review of the advancements made in the design of flexible battery components: the metal electrode, the electrolyte membrane, and the air electrode. Furthermore, the effects of operating conditions on battery performance characteristics and durabilities are discussed, including the effect of the operating temperature and the contaminants commonly encountered in ambient air (e.g., carbon dioxide and moisture). Finally, challenges facing the development of a new generation of flexible metal–air batteries are highlighted, together with further research directions and perspectives.

Flexible Zn– and Li–air batteries: recent advances, challenges, and future perspectives

Reactive dissolution and its effects on electrical conduction, morphological change and chemical transformation in thin films of Mg, AZ31B Mg alloy, Zn, Fe, W, and Mo in de-ionized (DI) water and simulated body fluids (Hanks’ solution pH 5–8) are systematically studied, to assess the potential for use of these metals in water-soluble, that is, physically "transient", electronics. The results indicate that the electrical dissolution rates in thin films can be much different that traditionally reported corrosion rates in corresponding bulk materials. Silicon metal oxide field effect transistors (MOSFETs) built with these metals demonstrate feasibility for use in transient electronics.

Dissolvable Metals for Transient Electronics

Confining Sulfur in Integrated Composite Scaffold with Highly Porous Carbon Fibers/Vanadium Nitride Arrays for High-Performance Lithium–Sulfur Batteries

XPS studies on surface reduction of tungsten oxide nanowire film by Ar+ bombardment

All-flexible lithium ion battery based on thermally-etched porous carbon cloth anode and cathode

Nanocrystalline CeO2−Tb2O3 composite oxides films with various morphologies were prepared by electrodeposition under different conditions. These samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy (RS), and X-ray photoelectron spectroscopy (XPS). The magnetic properties of the samples were also studied. By increasing the concentration of Tb(NO3)3 or current density, the CeO2−Tb2O3 films with nanobelt structure changed into a blossom-shaped structure with lots of wrinkles and large surface area. XRD and Raman spectroscopy showed the crystal sizes of the samples to be 4−7 nm. XPS analysis indicated that higher current density was favorable to the deposition of CeO2 and inhibited the formation of Tb2O3. The morphology and magnetic property of the samples were determined by the composition. Only the sample mainly composed of Tb2O3 showed ferromagnetism.

Hui Meng

Papers

XPS studies on surface reduction of tungsten oxide nanowire film by Ar+ bombardment

All-flexible lithium ion battery based on thermally-etched porous carbon cloth anode and cathode

Preparation and Characterization of Nanocrystalline CeO2-Tb2O3 Films Obtained by Electrochemical Deposition Method