Cathodes gas diffusion

Therefore, one main drawback of the PEMFC configuration with a standard proton exchange membrane (such as Nafion) and a standard platinum gas diffusion cathode is the cathode depolarization caused by a mixed potential resulting from the methanol crossover through the mem-... 

We believe that new type of conducting polymer / expanded graphite composite electrodes as gas-diffusion cathodes will find in perspective a practical application for some types of batteries and fuel cells. 

Metal-air cells are developed with air gas-diffusion cathodes and Mg-anodes. Non-aggressive NaCl-solution is used as electrolyte. Carbon based catalysts for the oxygen reduction are selected and tested in the air gas-diffusion electrodes. Various Mg-alloys are tested as anodes. The V-A, power and discharge characteristics of the Mg-air cells are investigated. 

Hatch M, Nishiki Y, Nakamatsu (1992) A study on electrochemical ozone generator using gas diffusion cathode, Japan Electrochem Soc Meeting, April, cited in Ref [129]... 

The same holds for Silflon cathodes, which with silver loadings of 0.1 g/cm2 of electrode area exhibit an active catalyst surface of no more than 0.24 m2/m2. These Silflon electrodes are produced by chemically depositing silver on PTFE particles of 0.5 to 1 fim size and working these tiny silver-covered particles into electrodes by calendaring or pressing. Figure 22 compares the current voltage curve of typical gas diffusion cathodes in alkaline electrolyte. 

The concept had been tested at Los Alamos National Laboratory until 2005. The cell included an ion-exchange membrane, that divided the cell into an anode chamber with an anode, and a cathode chamber with an oxygen gas diffusion cathode. The design of the cell was adjusted to reduce the formation of peroxide associated with the reduction of oxygen. ... 

Bidault F, Brett DJL, Middleton PH, Brandon NP (2009) Review of gas diffusion cathodes for alkaline fuel cells. J Power Sources 187(l) 39-48... 

Gas diffusion cathode Anode Pt, BDD, or Ti/Pt Acidic media Proton exchange membrane Peroxide production and oxidation of organic sulfur Al-Shafei, (2013)... 

Large area ( 2 m ), bipolar cells O2 reduction gas diffusion cathodes... 

Figures 3 and 4 predict that coupling an oxygen gas diffusion cathode, at which the reaction occurs, in principle could drive reaction at a suitable anode, forming the basis of a fuel cell with the overall reaction ...

Figure 11.2. Schematic of photocatalytic fuel cell with two-compartment photoelectrochemical cell (1) photocatalyst layer Pt-WOs decorated Ti02 NTs (2) carbon cloth (3) electro-catalyst layer Pt-WOs (4) polymer electrolyte membrane (5) Pt/C electro-catalyst for oxygen reduction (6) wastewater chamber (7) light window (8) bifunctional anode (9) gas diffusion cathode.

The scale-up and integration of multiple air-breathing fuel cells, while ensuring sufficient oxidant access, can be complicated by geometrical restrictions. INI Power Systems (Morrisville, NC) is developing a direct methanol microfluidic fuel cell system with integrated gas diffusion cathode for commercial applications. Notably, recent improvements of electrodes and catalysts, optimization of methanol concentration and flow rates, and the addition of a gaseous flow field on the cathode side have resulted in impressive power densities on the order of 100 mW cm [42], As compared to conventional MEA-based direct methanol fuel cells, these microfluidic fuel cells are competitive. 

Sell, D., Kramer, P., Kreysa, G. (1989) Use of an oxygen gas diffusion cathode and a three-dimensional packed bed anode in a bioelectrochemical fuel cell. Applied Microbiology and Biotechnology, 31, 211-213. 

Lau C, Adkins ER, Ramasamy RP, Luckarift HR, Johnson GR, Atanassov P. Design of carbon nanombe-based gas-diffusion cathode for O2 reduction by multicopper oxidases. Adv Energy Mater 2011 2 162-168. 

Insertion MEFC with Needle Anode and Gas Diffusion Cathode... 

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