نتایج جستجو برای: cathode catalyst layer
تعداد نتایج: 337726 فیلتر نتایج به سال:
The cathode catalyst layer (CL) in direct methanol fuel cells (DMFCs) has been optimized through a balance of ionomer and porosity distributions, oth playing important roles in affecting proton conduction and oxygen transport through a thick CL of DMFC. The effects of fabrication rocedure, ionomer content, and Pt distribution on the microstructure and performance of a cathode CL under low air f...
To approach this goal, we develop a detailed 1D model to describe the DMFC on the electrode and cell level, based on the in-house modeling framework DENIS. A two-phase flow model is implemented for the transport in gas diffusion layer (GDL) and catalyst layer (CL) at the anode side, whereas we consider only the gas phase at the cathode side. Electrochemistry is described by multistep mechanisms...
Proton exchange membrane fuel cells (PEMFC) are highly efficient power generators, being used recently in a clean hybrid power supply system. Comsol Multiphysics, a commercial solver based on the Finite Element Method (FEM) was used for developing a three dimensional model of a high temperature PEMFC in order to study operation mode and performance of the fuel cell. Cathode gas flow velocity in...
The development of rechargeable zinc–air batteries is hindered by the low energy- conversion efficiency and short cycle life, which are partly due to the unsatisfactory performance oxygen electrocatalysts on air-cathode. The low catalysts partially complexity gas- involving multiphase interface required for cataly sis reactions, it is often acquired only a fraction loaded catalyst that in ...
Pt-Pd catalyst supported on nitrogen-doped carbon nanofiber (N-CNF) was prepared and evaluated as a cathode electrode of the direct methanol fuel cell (DMFC). The N-CNF, which was directly synthesized by the catalytic chemical vapor deposition from acetonitrile at 640 °C, was verified as having a change of electrochemical surface properties such as oxygen reduction reaction (ORR) activities and...
a r t i c l e i n f o High-performance microbial fuel cell (MFC) air cathodes were constructed using a combination of inexpensive materials for the oxygen reduction cathode catalyst and the electrode separator. A poly(vinyl alcohol) (PVA)-based electrode separator enabled high coulombic efficiencies (CEs) in MFCs with activated carbon (AC) cathodes without significantly decreasing power output....
The performance and efficiency of an open-cathode PEM fuel cell system in dead-ended anode (DEA) configuration and hydrogen purges is analyzed in this work. Excess water and crossed-over nitrogen in the anode decrease the hydrogen concentration at the catalyst surface, which in turn causes performance losses. Purging the anode with hydrogen removes water and nitrogen and thus recovers the perfo...
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