Aplicación de hidróxidos laminares de Ni, Fe y Co para la conversión de energía: Hidrólisis del agua

2020 ◽  
pp. 151-170
Author(s):  
Ariel Guzmán Vargas ◽  
◽  
Juvencio Vázquez Samperio ◽  
María de J. Martínez Ortiz ◽  
Miguel A. Oliver Tolentino ◽  
...  
Keyword(s):  
Core Shell

El avance tecnológico requiere de materiales que tengan un impacto directo en la vida cotidiana. Así, el desarrollo y aplicación de sistemas más eficientes, sustentables y por lo tanto no agresivos con el ambiente son un reto para la comunidad científica al involucrar diferentes disciplinas en la búsqueda de lograr el control de las propiedades a nivel nanométrico. En particular, los materiales multi-hidróxidos laminares, comúnmente conocidos como HDL, brindan un panorama prometedor ya que sus propiedades y composición pueden ser moduladas desde la síntesis, para una amplia gama de usos y aplicaciones. Recientemente, en áreas muy diferentes las aplicaciones de estos materiales han sido exploradas; por ejemplo: magnetismo, reacciones de producción de energía (electrocatalizadores), sensores electroquímicos, sistemas portadores-liberadores de fármacos, representan áreas de oportunidad. Por otra parte, sistemas en bajas dimensiones, la obtención de nanoláminas o nanohojas (nanosheets) a partir de la exfoliación de estos nanomateriales: nanopelículas multicapa, nanocompósitos y estructuras core-shell. La presente propuesta pretende desarrollar materiales tipo HDL multicatiónicos involucrando aspectos desde la concepción, síntesis y aplicación en la electrólisis del agua, proceso fundamental en la producción de hidrógeno, como fuente de energía renovable y una alternativa de las fuentes de energías tradicionales generadoras de contaminantes.

A crystalline–amorphous Ni–Ni(OH)2 core–shell catalyst for the alkaline hydrogen evolution reaction

2020 ◽  
Vol 8 (44) ◽  
pp. 23323-23329
Author(s):  
Jing Hu ◽  
Siwei Li ◽  
Yuzhi Li ◽  
Jing Wang ◽  
Yunchen Du ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Core Shell ◽  
Alkaline Conditions

Crystalline–amorphous Ni–Ni(OH)2 core–shell assembled nanosheets exhibit outstanding electrocatalytic activity and stability for hydrogen evolution under alkaline conditions.

Electrical Conductivity of Ni-YSZ Anode for SOFCs According to the Ni Powder Size Variations in Core-shell Structure

2015 ◽  
Vol 53 (4) ◽  
pp. 287-293
Author(s):  
Byung-Hyun Choi ◽  
Young Jin Kang ◽  
Sung-Hun Jung ◽  
Yong-Tae An ◽  
Mi-Jung Ji
Keyword(s):  
Electrical Conductivity ◽  
Shell Structure ◽  
Core Shell ◽  
Powder Size ◽  
Ni Powder ◽  
Core Shell Structure

Magnetic Properties of Fe3O4/CoFe2O4 Composite Nanoparticles with Core/Shell Architecture

2020 ◽  
Vol 65 (10) ◽  
pp. 904
Author(s):  
V. O. Zamorskyi ◽  
Ya. M. Lytvynenko ◽  
A. M. Pogorily ◽  
A. I. Tovstolytkin ◽  
S. O. Solopan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spinel Ferrite ◽  
Composite Nanoparticles ◽  
Core Shell ◽  
Cofe2o4 Nanoparticles ◽  
Core Diameter ◽  
The Core ◽  
Shell Particles ◽  
Interface Parameters ◽  
Shell Composite

Magnetic properties of the sets of Fe3O4(core)/CoFe2O4(shell) composite nanoparticles with a core diameter of about 6.3 nm and various shell thicknesses (0, 1.0, and 2.5 nm), as well as the mixtures of Fe3O4 and CoFe2O4 nanoparticles taken in the ratios corresponding to the core/shell material contents in the former case, have been studied. The results of magnetic research showed that the coating of magnetic nanoparticles with a shell gives rise to the appearance of two simultaneous effects: the modification of the core/shell interface parameters and the parameter change in both the nanoparticle’s core and shell themselves. As a result, the core/shell particles acquire new characteristics that are inherent neither to Fe3O4 nor to CoFe2O4. The obtained results open the way to the optimization and adaptation of the parameters of the core/shell spinel-ferrite-based nanoparticles for their application in various technological and biomedical domains.

Preparation of Porous Core/Shell Structure Fe$lt;inf$gt;2$lt;/inf$gt;O$lt;inf$gt;3$lt;/inf$gt;/Al Nanothermite Membrane by Template Method

2015 ◽  
Vol 30 (6) ◽  
pp. 610 ◽  
Author(s):  
ZHENG Guo-Qiang ◽  
ZHANG Wen-Chao ◽  
XU Xing ◽  
SHEN Rui-Qi ◽  
DENG Ji-Ping ◽  
...  
Keyword(s):  
Shell Structure ◽  
Template Method ◽  
Core Shell ◽  
Porous Core ◽  
Core Shell Structure

261-OR: Core-Shell Spherification: A New Microencapsulation Platform for Hyaluronic Acid and PEGDA

Diabetes ◽  
2019 ◽  
Vol 68 (Supplement 1) ◽  
pp. 261-OR
Author(s):  
FRANCIS KARANU ◽  
STEPHEN HARRINGTON ◽  
LINDSEY OTT
Keyword(s):  
Hyaluronic Acid ◽  
Core Shell

Non-Plasmonic SERS with Silicon: Is It Really Safe? New Insights into Opto-Thermics of Core/Shell Microbeads

2018 ◽  
Author(s):  
Nicolò Bontempi ◽  
Irene Vassalini ◽  
Stefano Danesi ◽  
Matteo Ferroni ◽  
Paolo Colombi ◽  
...  
Keyword(s):  
Critical Role ◽  
Raman Laser ◽  
Core Shell ◽  
Thermal Coupling ◽  
Melting Points ◽  
Experimental Proof ◽  
Weakly Coupled ◽  
Light Management ◽  
Laser Sources ◽  
First Time

<p>Here we investigate for the first time the opto-thermal behavior of SiO<sub>2</sub>/Si core/shell microbeads (Si-rex) irradiated with three common Raman laser sources (lambda=532, 633, 785 nm) under real working conditions. We obtained an experimental proof of the critical role played by bead size and aggregation in heat and light management, demonstrating that in the case of strong opto-thermal coupling the temperature can exceed that of the melting points of both core and shell components. In addition, we also show that weakly coupled beads can be utilized as stable substrates for plasmon-free SERS experiments.</p>

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