Fabrication of Poly(chlorotrifluoroethylene)/Precious Metal Composite Electrodes

The design and synthesis of non-precious metal composite catalysts with yolk-shell structure and diverse composition are challenges in material science for energy conversion. In this work, we established a facile...

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Progress on the Precious Metals Used in High-Temperature Protective Coatings

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.665.49 ◽

2014 ◽

Vol 665 ◽

pp. 49-55 ◽

Cited By ~ 1

Author(s):

Yan Wei ◽

Li Chen ◽

Hong Zhong Cai ◽

Xiao Hong Qi ◽

Xu Zheng ◽

...

Keyword(s):

High Temperature ◽

Precious Metal ◽

Protective Coatings ◽

Composite Coatings ◽

Precious Metals ◽

Niobium Alloy ◽

Limiting Factors ◽

Metal Composite ◽

Reinforced Composite ◽

Materials Used

Nickel-based super alloy, niobium alloy, refractory metal and carbon fiber reinforced composite are the most common structural materials used in aviation and spaceflight fields. Reduced oxidation and corrosion resistance at high temperature are limiting factors to the application of theses materials. Adapted protective coatings such as pure precious metal coatings, precious metal alloy and precious metal composite coatings can be applied on the surface of theses materials. New advances of oxidation protective coating in recent years are reviewed in this paper, combined with some research on the preparation of iridium

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Screen-Printed NiO-YSZ Thin Film Electrode for Solid Oxide Electrochemical Cell and Subsequent Reduction to Ni-YSZ

Materials Science Forum ◽

10.4028/www.scientific.net/msf.950.123 ◽

2019 ◽

Vol 950 ◽

pp. 123-127

Author(s):

Agnes L. Manalo ◽

Rinlee Butch M. Cervera

Keyword(s):

Thin Film ◽

Electronic Conductivity ◽

Combustion Process ◽

Solid Oxide ◽

Metal Composite ◽

Composite Electrodes ◽

X Ray Diffraction ◽

Xrd Patterns ◽

Screen Print ◽

Glycine Nitrate Combustion

Nickel and yttria-stabilized zirconia (Ni-YSZ) ceramic-metal composite electrodes are commonly used for solid oxide electrochemical cells because of their good ionic and electronic conductivity. In this study, a thin film of NiO-YSZ was prepared via screen-print method and subsequently reduced to Ni-YSZ. The precursor powder for screen-printing was prepared via glycine-nitrate combustion process. The effect of precursor particle size and of the use of PVP as binder on film uniformity and quality were investigated. For the NiO-YSZ film, scanning electron microscopy (SEM) micrographs and X-ray diffraction (XRD) patterns confirmed that size reduction and the use of binder both improved the quality and uniformity of the deposit without changing the composition of the sintered film. SEM with energy-dispersive spectroscopy (EDS) showed elemental mapping of unreduced and reduced films, revealing micro grain size faceted particles of NiO and Ni, while smooth and much larger YSZ grains were also observed. XRD of reduced Ni-YSZ film revealed that the NiO peaks had been replaced by Ni.

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Preparation and structure of Na2Ag5Fe3(P2O7)4 -Ag metal composite: Insights on electrochemistry

MRS Advances ◽

10.1557/adv.2017.56 ◽

2017 ◽

Vol 2 (7) ◽

pp. 395-400 ◽

Cited By ~ 2

Author(s):

Yiman Zhang ◽

Amy C. Marschilok ◽

Esther S. Takeuchi ◽

Kenneth J. Takeuchi

Keyword(s):

Chemical Reduction ◽

Rate Capability ◽

Rietveld Analysis ◽

Partial Replacement ◽

Metal Composite ◽

Composite Electrodes ◽

Ion Conductor ◽

Fast Ion Conductor ◽

Fast Ion

ABSTRACTAg7Fe3(P2O7)4 is a 3D structured material which has been recently studied as a possible cathode material for lithium batteries. Notably, Na7Fe3(P2O7)4 is reported to be a fast-ion conductor, yet poor electrical conductor. Here, partial replacement of Na+ for Ag+ yielded Na2Ag5Fe3(P2O7)4 pyrophosphate framework where the formation of Ag metal is proposed to increase the intrinsic low electrical conductivity of this polyanion electrode. Specifically, the Ag5Na2Fe3(P2O7)4 -Ag composite is synthesized via chemical reduction of Ag7Fe3(P2O7)4 using NaBH4. The occupancy of Ag+ and Na+ in each site was determined via Rietveld analysis of the diffraction pattern. Electrochemistry of the Ag5Na2Fe3(P2O7)4 -Ag metal composite was explored with voltammetry and galvanostatic charge/discharge cycling. The Ag5Na2Fe3(P2O7)4 -Ag metal composite electrodes displayed good rate capability assisted by the presence of Ag metal from the chemical reduction and in-situ electrochemical formation of a Ag conductive network.

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