Materials Literature
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The influence of Lithium adatom and edge modification on the electronic structure and the transport properties of zigzag-edged graphene nanoribbons (ZGNRs) were studied using ab initio density functional theory in combination with the nonequilibrium green’s function methods. We find that lithium adatoms adsorb prefere…
The air maldistribution through different individual cells is frequently encountered in direct methanol fuel cell (DMFC) stacks since most stacks utilize parallel flow configuration. This air maldistribution has been recognized as one of the most important causes for the performance loss and even durability loss of DM…
The present work deals with the study of uptake behaviour of Cd(II), Pb(II), and Zn(II) ions by Electrochemically synthesized Poly-(ortho-phenylenediamine) (POPD) using batch equilibration technique with both single and binary mixtures. The effect of the various parameters such as electrochemically synthesis method, p…
Membrane electrode assemblies (MEAs) for an intermediate temperature fuel cell were prepared and evaluated as direct ethanol fuel cell (DEFC) and as hydrogen fuel cell. As proton conductor, a temperature stable electrolyte for intermediate temperatures with superior ionic conductivity was prepared from ammonium polyph…
Linear and nonlinear (in both steady and transient shear flows) rheological properties of polyamide 6/acrylonitrile–butadiene–styrene (PA6/ABS) nanocomposite blends have been investigated. Characterization of nanocomposite samples morphology by scanning electron microscopy revealed that with increasing nanoclay loadin…
An emergency shutdown of an SOFC system gives rise to an increase of the anode-side partial pressure of oxygen (p(O2),a). This leads to electrolyte breakdown due to the anode strain caused by Ni-zirconia cermet reoxidation. We determined the open circuit voltage recovery and drop conditions at various (p(O2),a)’s and…
Anode supported solid oxide fuel cells (SOFCs) utilizing apatite-type Mg-doped lanthanum silicate (MDLS) electrolytes obtained from nano-sized printable paste coated on NiO-MDLS substrates were fabricated. With optimizing fabrication conditions of MDLS films, anode and cathode materials, the performance was largely im…
Two novel nickel(II) salens modified with a side alkanethiol chain containing either six or eight methylene groups (Ni(II)L-(CH2)6SH or Ni(II)L-(CH2)8SH) were obtained by a multistep synthetic route. The catalysts were used to coat the gold electrode via self-assembly with the formation of a compact monolayer. Cyclic…
Cathode-supported SOFCs are attractive for the potential utilization of hydrocarbons as fuels to generate electricity because Cu-based anodes can be used to deal with coke formation in the Ni-base anodes. However, Cu-based anodes cannot be used in anode-supported SOFCs because the high sintering temperatures (above 13…
Neodymium-doped ceria (Nd0.2Ce0.8O1.9, NDC)-based composite electrolytes with (Li/0.5Na)2CO3 have a higher conductivity than pure NDC in the intermediate temperature range (500-700°C). This may be attributed to protons that contributes to an improvement in the ionic conductivity across grain boundaries or phase interf…
Electrochemical Impedance Spectroscopy (EIS) is a powerful tool to get a deeper insight on the performance of high-temperature electrolysis cells. Indeed, when used in particular conditions, this technique allows distinguishing different phenomena contributing to electrochemical reactions and degradation mechanisms. B…
A hydrothermal route was used to synthesize gadolinia-doped ceria with highly dispersed Ni particles. The microstructural and electrical properties of the cermet revealed that Ni attained percolation at relatively low volume fraction. The cermet was used as a catalytic layer deposited onto the standard Ni-based anode…
In the frame of an activity oriented on the development and characterization of cells and stacks for the integration in a micro-CHP system, synthesis, formulation and optimization of manganese cobalt spinel for the deposition of protective coatings on interconnector plates have been performed. A description of the pro…
Highly porous carbon has been modified on the surface with several different elements, including boron, nitrogen, sulfur, and copper. Surface modification is shown to affect the pore structure, pyrolysis and activation processes, and wetting behavior of the underlying porous carbon. When tested for energy storage appl…
Quaternary Cu2ZnSnS4 (CZTS) films were successfully obtained on Mo/(soda lime glass) substrates by one-step electro-deposition. The process was more efficient than other electro-deposit processes. Electrolytic aqueous was prepared using CuSO4, ZnSO4, SnSO4 and Na2S2O3 mixing solution. A galvanostat was applied for the…
This proceedings manuscript describes representative results of thin film micro-solid oxide fuel cells (micro-SOFCs) utilizing nano-porous ruthenium (Ru) and Ru – gadolinia doped ceria (CGO) nano-composite anodes, investigated for operation with various fuels. 8 mol% yttria-stabilized zirconia (8YSZ) and compositional…
Novel thin film fuel cell based on the 100 nm-thick electrolyte of amorphous ZrP2.5O x , working at 400°C, was demonstrated. The hydrogen permeable membrane fuel cell (HMFC) using a Pd foil as a nonporous solid anode was fabricated. Ni interlayer of several hundreds nm thickness was introduced between the Pd anode and…
In this paper, SWNTs synthesized by an improved arc discharge method were chemically purified, and then sonically dispersed in an aqueous cosurfactant solution of sodium deoxycholate and sodium dodecyl sulfate. Density gradient ultracentrifugation showed that the separation of such chemically purified SWNTs by diamete…
The conversion of fuel into hydrogen-rich gas is necessary for fuel cells. This can be achieved either indirectly in fuel processing systems, in which the hydrocarbon feed is converted in an external catalytic steam reformer, or directly in the fuel cell. In this paper, the unit module of solid oxide fuel cell was ass…
A high-pressure dual-chamber SOFC testing facility is established to measure AC impedance spectra of a planar anode-supported single-cell stack using flow distributors, with emphasis on the effect of pressurization to the anodic concentration polarization. Measurements show that the high frequency arcs of impedance sp…