Catalyst layer composite

Optimization of the catalyst layer composition and thickness in PEFCs for maximum catalyst utilization in operation on air and on impure hydrogen feed streams [Wilson, 1993 Springer et al., 1993]. 

The most recent improvements in Pt catalyst utilization U by optimization of catalyst layer composition and stmcture have led to catalyst utilizations as high as 80%, or more, determined as the ratio between measured ORR current per geometric square centimeter of electrode area and the current expected from the total measured Pt surface area per geometric square centimeter of the electrode, i.e.,... 

Louh, R. R, Ghang, A. C. C., Chen, V., and Wong, D. Design of electrophoretically deposited microporous layer/catalysts layer composite structure for power generation of fuel cells. International Journal of Hydrogen Energy 2008 33 5199-5204. 

The macrohomogeneous model was exploited in optimization studies of the catalyst layer composition. The theory of composifion-dependent performance reproduces experimental findings very well. - The value of the mass fraction of ionomer that gives the highest voltage efficiency for a CCL with uniform composition depends on the current density range. At intermediate current densities, 0.5 A cm < jo < 1.2 A cm , the best performance is obtained with 35 wt%. The effect of fhe Nation weight fraction on performance predicted by the model is consistent with the experimental trends observed by Passalacqua et al. ... 

F. Uribe and T. Zawodzinski, "A Study of Polymer Electrolyte Fuel Cell Performance at High Voltages. Dependence on Cathode Catalyst Layer Composition and on Voltage Conditioning". Accepted in Electrochimica Acta. (2002). 

The macroscopic catalyst layer composition is specified in terms of the volume portions of solid Pt/C (A ptc) and membrane electrolyte (Tei). The remaining volume is occupied by pores with total porosity Xp = I — Zptc — Xe. For modeling purposes, it is expedient to utilize a bimodal log-normal psd, as distributions of this type are often found experimentally [24]... 

Friedmann R, Nguyena TV. Optimization of the cathode catalyst layer composition using a novel 2-step preparation method. ECS Trans 2008 16(2) 2021-9. 

Olson TS, Chapman K, Atanassov P (2008) Non-platinum cathode catalyst layer composition for single membrane electrode assembly proton exchange membrane fuel cell. J Power Density 183 557-563... 

Uribe FA, Zawodzinski TA (2002) A study of polymer electrolyte fuel cell performance at high voltages. Dependence on cathode catalyst layer composition and on voltage conditioning. Electrochim Acta 47(22-23) 3799-3806... 

Optimization of HT-PEMFC catalyst and catalyst layer composition and structure through iimovative design, evaluation, as well as fundamental understanding. 

Membrane and catalyst layer composition Defined as model constants, parameters, and functions Difficult to get for conunercially available products. Experimental investigations needed... 

---