Cathode Catalysts

Table 2. Comparison of Oiganic Method Platinum on Carbon Black vs. Commercial Catalyst (cathode metal only)...

Fuel cell Anode catalyst Cathode catalyst... 

Certain performance losses of fuel cells during steady-state operation can be fully or partially recovered by stopping and then restarting the life test. These recoverable losses are associated to reversible phenomena, such as cathode catalyst surface oxidation, cell dehydration or incomplete water removal from the catalyst or diffusion layers [85]. Other changes are irreversible and lead to unrecoverable performance losses, such as the decrease in the ECSA of catalysts, cathode contamination with ruthenium, membrane degradation, and delamination of the catalyst layers. 

Anodic catalyst Cathodic catalyst Figure 1 Schematic diagram of a PEMFC... 

Babu SK, Chung HT, Wu G, Zelenay P, Litster S (2014) Modeling hitaarchical non-precious metal catalyst cathodes for PEFCs using multi-scale X-ray CT imaging. ECS Trans 64 281-292... 

OH -conducting, alkaline polymer free of metal ions and consisting of counter ions bound to the quaternary-ammonium containing polymer backbone has been reported with reasonable preliminary results (133-153 pm thick, 0.0092 S/cm 30°C, 100% RH) [110]. H2I Air alkaline membrane fuel cells that showed encouraging preliminary results with Pt and transition metal catalyst cathodes in CO2 free air have also been reported recently by Acta S.p.A. [111]. 

Fuel cell Pressure bar Temp. °C KOH (% cone.) Anode catalyst Cathode catalyst... 

Pressure Temp Time Anode Anode Catalyst Cathode Cathode Catalyst Dispersion... 

Design Fuel/oxidant Electrolyte Anode catalyst Cathode catalyst Channel Current collector... 

Using fenicyanide as the electron acceptor in the cathode chamber increases the power density due to the availability of a good electron acceptor at high concentrations. Ferricyanide increased power by 1.5-1.8 times compared with a Pt catalyst cathode and dissolved oxygen (H-design reactor with a Nafion CEM) [69]. The highest power densities so far reported for MFC systems have been low internal resistance systems with ferricyanide at the cathode [44,56]. While ferricyanide is an excellent catholyte in terms of system performance, it must be chemically regenerated and its use is not sustainable in practice. Thus, the use of ferricyanide is restricted to fundamental laboratory smdies. 

SizeofMEA ISinmx 18mm membrane Nafion I12 anodeeaialysi Pi- or Pd-based catalyst cathode catalyst Pi... 

F. 24 Current density-cell voltage characteristics for different catalyst in 2 M methanol/3 M KOH solution in direct alcohol alkaline fuel cell at 25°C, Anode Different Pt-based catalyst Cathode Mn02-... 

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