نتایج جستجو برای: catalyst layer cl

تعداد نتایج: 362601  

Journal: :Organic & biomolecular chemistry 2014
Mathieu Lesieur Alexandra M Z Slawin Catherine S J Cazin

The new well-defined catalyst [Pd(μ-Cl)Cl(IPr*)]2 enables the efficient Grignard reagent cross-coupling for the synthesis of tetra-ortho-substituted biaryls. The high reactivity of the complex is associated with the important bulkiness of the IPr* ligand. The dimer represents the most efficient catalyst reported to date for this challenging transformation.

Journal: :Advanced Energy Materials 2021

Polymer electrolyte fuel cells (PEFCs) are a promising replacement for the fossil fuel–dependent automotive and energy sectors. They have become increasingly commercialized in last decade; however, significant limitations on durability performance limit their commercial uptake. Catalyst layer (CL) design is commonly reported to impact device power density durability; although, consensus rarely ...

Journal: :Energies 2021

To decrease the cost of fuel cell manufacturing, amount platinum (Pt) in catalyst layer needs to be reduced. In this study, ionomer gradient membrane electrode assemblies (MEAs) were designed reduce Pt loading without sacrificing performance and lifetime. A two-layer stratification cathode was achieved with varying ratios 28 wt. % inner layer, on membrane, 24 outer coated onto layer. study MEA ...

2017
Noor Al-Rifai Peter J. Miedziak Moataz Morad Meenakshisundaram Sankar Conor Waldron Stefano Cattaneo Enhong Cao Samuel Pattisson David Morgan Donald Bethell Graham J. Hutchings Asterios Gavriilidis

Highly active, supported Au−Pd catalysts have been tested for catalyzing benzyl alcohol oxidation in a siliconglass micropacked bed reactor. The effects of Au−Pd composition and anion content during catalyst preparation on catalyst deactivation were studied, and a relationship between the deactivation rate and the amount of Cl− and Au used in the catalyst formulation was found. While Au aids in...

Journal: :Computation 2016
Chao-Zhong Qin S. Majid Hassanizadeh Lucas M. Van Oosterhout

In the cathode side of a polymer electrolyte fuel cell (PEFC), a micro porous layer (MPL) added between the catalyst layer (CL) and the gas diffusion layer (GDL) plays an important role in water management. In this work, by using both quasi-static and dynamic pore-network models, water and vapor transport in the MPL and GDL has been investigated. We illustrated how the MPL improved water manage...

Journal: :Journal of the American Chemical Society 2013
James D Blakemore Ayush Gupta Jeffrey J Warren Bruce S Brunschwig Harry B Gray

We show that molecular catalysts for fuel-forming reactions can be immobilized on graphitic carbon electrode surfaces via noncovalent interactions. A pyrene-appended bipyridine ligand (P) serves as the linker between each complex and the surface. Immobilization of a rhodium proton-reduction catalyst, [Cp*Rh(P)Cl]Cl (1), and a rhenium CO2-reduction catalyst, Re(P)(CO)3Cl (2), afford electrocatal...

Ali Reza Sardarian Habib Firouzabadi Shahram Tangestaninejad Zohreh Khayat

Metalloporphirins; Cu(TPP), Mn(TPP)Cl, CO(TPP), Fe(TPP)Cl, zn(TPP) and Mn(OBP)Cl catalyze region and chemoselective silylation of hydroxyl groups with HMDS. Fe(TPP)Cl is the most effective catalyst and silylation occurs immediately in its presence at room temperature.

Journal: :Journal of the American Chemical Society 2005
Nathan C Gianneschi SonBinh T Nguyen Chad A Mirkin

The design of a supramolecular allosteric catalyst system for catalytic signal amplification and detection is presented. The catalyst was switched "on" by the introduction of an analyte that also behaves as an allosteric activator. Concentrations of Cl- ions as low as 800 nM were catalytically amplified and detected. The signal was transduced via a pH-sensitive fluorescent probe and observed vi...

2014
Petri Kanninen Tanja Kallio

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Petri Kanninen Name of the doctoral dissertation Characterization of nanostructured catalysts and silicon microstructures in polymer electrolyte membrane fuel cells Publisher School of Chemical Technology Unit Department of Chemistry Series Aalto University publication series DOCTORAL DISSERTATIONS 76/2014 Field of research Ph...

Journal: :Energies 2022

Optimization of the structure cathode catalyst layers (CCLs) for promoting transfer reactants and products in polymer electrolyte fuel cells (PEFCs) is important improving cell performance. In this study, using theoretical equations, we confirmed that shortened proton conduction path ionomer layer (IL) with a 3D-patterned structure, compared to IL flat-patterned can improve We experimentally in...

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