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PubMed Journals Articles About "Global PEMFC Proton Exchange Membrane Fuel Cells Market" RSS

10:31 EST 16th December 2018 | BioPortfolio

Global PEMFC Proton Exchange Membrane Fuel Cells Market PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Global PEMFC Proton Exchange Membrane Fuel Cells Market articles that have been published worldwide.

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Showing "Global PEMFC Proton Exchange Membrane Fuel Cells Market" PubMed Articles 1–25 of 32,000+

Numerical analysis of flow distribution behavior in a proton exchange membrane fuel cell.

The flow distribution of a proton exchange membrane fuel cell within a manifold plays an important role on its performance. This study presents a numerical analysis of the flow distribution behavior within different manifold configurations. A two-dimensional model with 75 cells was employed to study the flow behavior. The variation in the stoichiometry and number of cells was also studied. Three different flow configurations were considered with different numbers of flow inlets and outlets. The flow charact...


Extra water- and acid-stable MOF-801 with high proton conductivity and its composite membrane for proton exchange membrane.

Proton exchange membranes (PEMs), characterized by selectively permitting the transfer of proton and acting as separator in electrochemical devices, have attracted immense attention. The composite membrane fabricated from a proton conducting MOF and organic polymer combines the unique physical and chemical nature of the polymer and the high proton conductance of MOF, achieving collective properties to fabricate high-performance PEMs. In this work, we present the study of a proton conducting MOF-801, which s...

Superprotonic Conductivity in Flexible Porous Covalent Organic Framework Membranes.

Poor mechanical stability of the polymer electrolyte membranes (PEMs) remains one of the bottlenecks towards improving the performance of the proton exchange membrane (PEM) fuel cells. The present work proposes a unique way to utilize crystalline covalent organic frameworks (COFs) as a self-standing, highly flexible membrane to further boost the mechanical stability of the material without compromising its innate structural characteristics. The as-synthesized p-toluene sulfonic acid loaded covalent organic ...


Hypophosphites as eco-compatible fuel for membrane-free direct liquid fuel cells.

Crossover of liquid fuel remains a severe problem for conventional direct liquid fuel cells even when polymer electrolyte membranes are applied. Herein, we report for the first time a membrane-free direct liquid fuel cell powered by alkaline hypophosphite solution. The proof-of-concept fuel cell yields a peak power density of 32 mW cm-2 under air flow at room temperature. The removal of the polymer electrolyte membrane is attributed to the high reactivity and selectivity of Pd and α-MnO2 towards the hypoph...

Impact of Film Thickness on Defects and the Graphitization of Nanothin Carbon Coatings Used for Metallic Bipolar Plates in Proton Exchange Membrane Fuel Cells.

Metallic bipolar plates (BPPs) are considered promising alternatives to traditional graphite BPPs used in proton exchange membrane fuel cells (PEMFCs). Major auto companies, such as Toyota, GM, Ford, and BMW, are focusing on the development of metallic BPPs. Amorphous carbon (a-C) coating are widely known to be effective at enhancing the performance of metallic BPPs. However, a-C coatings prepared by sputtering are mostly micrometers thick, which can render mass production difficult due to their low deposit...

Tuning Thiol-Based Self-Assembled Monolayer Chemistry on a Gold Surface toward Synthesis of Biochemical Fuel.

A proton gradient across the lipid membrane is required for production of biochemical fuel. Much effort has been devoted to reactions involving proton production in biomimetic assembled architectures under mild conditions. Here, we explore thiol-based self-assembled monolayer chemistry on a naked gold surface for production of biochemical fuel. Protons are generated when alkane thiols self-assemble on a gold surface and the proton yield can be tuned by the choice of thiol and by variation of the procedure u...

Cross-Linked Sulfonated Poly(arylene ether sulfone) Containing a Flexible and Hydrophobic Bishydroxy Perfluoropolyether Cross-Linker for High-Performance Proton Exchange Membrane.

Here we show a simple and effective cross-linking method to prepare high performance cross-linked sulfonated poly(arylene ether sulfone) (C-SPAES) membrane using bishydroxy perfluoropolyether (PFPE) as a cross-linker for fuel cell applications. C-SPAES membrane shows much improved physicochemical stability due to the cross-linked structure and reasonably high proton conductivity than non-crosslinked SPAES membrane due to the incorporation of flexible PFPE and the effective phase-separated morphology between...

An Alkaline-Exchange Polymer Membrane Electrolyte for High Performance of All-Solid-State Electrochemical Devices.

As a potential solution to ubiquitous energy concerns, anion-exchange membranes (AEMs) have been widely used as the electrolyte in alkaline fuel cells (AFCs), and significant refinement of AEMs has been achieved in the past few decades. However, it remains unknown whether AEMs can be used as an electrolyte in a solid-state supercapacitor or zinc air battery. A low-cost alkaline exchange-membrane electrolyte comprised of chitosan (CS) and poly(diallyldimethylammonium chloride) (PDDA) that possesses a high OH...

Synthesis and evaluation of HfO2 as a prospective filler in inorganic-organic hybrid membranes based on Nafion for PEM fuel cells.

Hybrid inorganic-organic Nafion membranes modified with metal oxides (typically TiO<sub>2</sub>, ZrO<sub>2</sub>, WO<sub>3</sub>) are a good alternative for fuel cells applications. However, one of their main limitations is associated with their relative low proton conductivity at temperatures above 80°C. In this work, we overcome this issue using HfO<sub>2</sub> as a filler. HfO<sub>2</sub> was prepared by a sol-gel method varying the HfCl<sub...

Magnetic field-oriented ferroferric oxide/poly(2,6-dimethyl-1,4-phenylene oxide) hybrid membranes for anion exchange membrane applications.

Concentrating on the ion conductivity of anion exchange membranes (AEMs), we present a magnetic-field-oriented strategy to address the insufficient ion conductivity and the lifetime problem of AEMs used in alkali membrane fuel cells (AMFCs). Magnetic ferroferric oxide (Fe3O4) is functionalized with quaternary ammonium (QA) groups to endow the QA-Fe3O4 with ion-exchange ability. A series of aligned QA-Fe3O4/poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) hybrid membranes were fabricated by doping QA-Fe3O4 in a ...

The enhancement of iron fuel cell on bio-cathode denitrification and its mechanism as well as the microbial community analysis of bio-cathode.

To address the issue of insufficient electrons during denitrification, an iron fuel cell (IFC) bioreactor using iron as abiotic anode was designed. The nitrogen removal efficiency (NRE) of IFC (2.54 ± 0.016%) was significantly lower than microbial fuel cell (MFC) (32.58 ± 0.033%) with same bio-cathode under autotrophic conditions, which was due to the permeation of acetate on proton exchange membrane (PEM) affected the process of enriching autotrophic denitrifying bacteria by MFC. When used in het...

Enhanced Performance of Sulfonated Poly (Arylene Ether Ketone) Block Copolymer Bearing Pendant Sulfonic Acid Groups for PEMFC Operating at 80% RH.

The series of sulfonated poly (arylene ether ketone) (SPAEK) block copolymers with controlled F-oligomer length bearing pendant diphenyl unit were synthesized via a polycondensation reaction. Sulfonation was verified by H NMR analysis to introduce selectively and intensively on the pendant diphenyl unit of polymer backbones. The SPAEK membranes fabricated by the solution casting approach were very transparent and flexible with the thickness of ~50㎛. Those membranes with different F-oligomer lengths was in...

Elucidating the morphological aspects and proton dynamics in a hybrid perfluorosulfonic acid membrane for medium-temperature fuel cell applications.

A perfluorosulfonic acid (PFSA) membrane, i.e. Nafion® 117, was doped with the heteropoly salts (HPS) Cs3PW12O40, Rb3PW12O40, and (NH4)3PW12O40. Also, composite membranes with CsxH3-xPW12O40 (x = 1, 2, and 3) as dopants were investigated, which were rendered insoluble by substituting protons with larger cations. Morphological assessment and a detailed analysis of the hopping events via SAXS measurement and analysis of the hydrogen bond networks were performed using classical and quantum hopping molecular d...

A surface proton antenna in carbonic anhydrase II supports lactate transport in cancer cells.

Many tumor cells produce vast amounts of lactate and acid, which have to be removed from the cell to avoid intracellular lactacidosis and suffocation of metabolism. In the present study, we show that proton-driven lactate flux is enhanced by the intracellular carbonic anhydrase CAII, which is colocalized with the monocarboxylate transporter MCT1 in MCF-7 breast cancer cells. Co-expression of MCTs with various CAII mutants in oocytes demonstrated that CAII facilitates MCT transport activity via CAII-Glu69 a...

Site-Specific Hydrogen Exchange in a Membrane Environment Analyzed by Infrared Spectroscopy.

Hydrogen exchange is a powerful method to examine macro-molecules. In membrane proteins, exchange can distinguish between solvent accessible and inaccessible residues due to shielding by the hydrophobic environment of the lipid bilayer. Herein, rather than examining which residues undergo hydrogen exchange, we employ a protocol that enables the full deuteration of all polar hydrogens in a membrane protein. We then measure the impact of hydrogen exchange on the shift of the amide I vibrational mode of indivi...

Impact of the Solid Interface on Proton Conductivity in Nafion Thin Films.

Proton conductivity of polyelectrolytes in the interfacial region with a solid is a key for the performance of polyelectrolyte-based fuel cells. The proton conductivity of Nafion thin films was examined as a function of the thickness along both directions, normal and parallel to the interface. Neutron reflectivity measurements revealed that a water-containing multilamellar structure was formed at the substrate interface. The presence of the interfacial layer, or the two-dimensional proton-conductive pathway...

Crosslinked PVA/SSA proton exchange membranes: correlation between physiochemical properties and free volume determined by positron annihilation spectroscopy.

Two processes for crosslinking polyvinyl alcohol (PVA) with sulfosuccinic acid (SSA) and thermal crosslinking were used to fabricate a proton exchange membrane (PEM). Such PEMs are used in different fields involving fuel cell applications. The crosslinking reaction between PVA and SSA was confirmed using Fourier-transform infrared (FTIR) spectroscopy. The characterization of the prepared membranes, namely, ion exchange capacity (IEC), thermal analyses, water uptake, and ionic conductivity, was carried out. ...

Restoration of cellular integrity following "ballistic" pronuclear exchange during Tetrahymena conjugation.

During sexual reproduction or conjugation, ciliates form a specialized cell adhesion zone for the purpose of exchanging gametic pronuclei. Hundreds of individual membrane fusion events transform the adhesion zone into a perforated membrane curtain, the mating junction. Pronuclei from each mating partner are propelled through this fenestrated membrane junction by a web of short, cris-crossing microtubules. Pronuclear passage results in the formation of two breaches in the membrane junction. Following pronucl...

N-doped Carbon CoOx Nanohybrids: The First Precious Metal Free Cathode to Achieve 1.0 W/cm2 Peak Power and 100 h Life in Anion-Exchange Membrane Fuel Cells.

Efficient and durable nonprecious metal electrocatalysts for the oxygen reduction (ORR) are highly desirable for several electrochemical devices, including anion exchange membrane fuel cells (AEMFCs). Here, a 2D planar electrocatalyst with CoOx embedded in nitrogen-doped graphitic carbon (N-C-CoOx) was created through the direct pyrolysis of a metal organic complex with a NaCl template. The N-C-CoOx catalyst showed high ORR activity, as well as excellent half-wave (0.84 V vs. RHE) and onset (1.01 V vs. RHE)...

Systematic calorimetric studies of proton exchange associated with binding of beta-lactoglobulin with ligand.

In proteins, proton exchange is caused due to the changes in the proton affinity (pK) of ionizable groups that are engaged in conformational changes induced by the binding of a ligand. In addition, knowledge regarding the type and number of such ionizable groups is very important to understand the pH-dependent changes of the thermodynamic parameters. Therefore, in this study, we performed a comprehensive analysis of proton exchange by using beta lactoglobulin (Blg), a representative of the lipocalin family ...

Production of dynamic lipid bilayers using the reversible thiol-thioester exchange reaction.

Thiol lysolipids undergo thiol-thioester exchange with two phenyl thioester-functionalized tails to produce phospholipid structures that assemble into liposomes with differences in exchange rates, temperature sensitivity, permeability, and continued exchange behavior. This in situ formation reaction imparts dynamic characteristics into the membrane for downstream liposome functionalization and mimics native membrane remodeling.

Complete Chain of the First Global Kidney Exchange Transplant and 3-yr Follow-up.

Global Kidney Exchange (GKE) offers an opportunity to expand living renal transplantation internationally to patients without financial means. These international pairs are entered into a US kidney exchange program that provides long-term financial support in an effort to identify opportunities for suitable exchanges for both these international pairs and US citizens.

How inter-subunit contacts in the membrane domain of complex I affect proton transfer energetics.

The respiratory complex I is a redox-driven proton pump that employs the free energy released from quinone reduction to pump protons across its complete ca. 200 Å wide membrane domain. Despite recently resolved structures and molecular simulations, the exact mechanism for the proton transport process remains unclear. Here we combine large-scale molecular simulations with quantum chemical density functional theory (DFT) models to study how contacts between neighboring antiporter-like subunits in the membr...

Osteoblast Bioenergetics and Global Energy Homeostasis.

The emergence of the endochondral skeleton in terrestrial animals enabled ambulation against increased gravitational forces and provided a storage site for scarce minerals essential for life. This skeletal upgrade increased overall fuel requirements and altered global energy balance, prompting the evolution of endocrine networks to coordinate energy expenditure. Bone-forming osteoblasts require a large and constant supply of energy substrates to fuel bone matrix production and mineralization. When fuel dema...

Activationless Multiple-Site Concerted Proton-Electron Tunneling.

The transfer of protons and electrons is key to energy conversion and storage, from photosynthesis to fuel cells. Increased understanding and control of these processes are needed. A new anthracene-phenol-pyridine molecular triad was designed to undergo fast photo-induced multiple-site concerted proton-electron transfer (MS-CPET), with the phenol moiety transfer-ring an electron to the photo-excited anthracene and a proton to the pyridine. Fluorescence quenching and transient absorp-tion experiments in solu...


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