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首页> 外文期刊>International Journal of Electrochemical Science >Effect of a Rigid Gas Diffusion Media Applied as Distributor of Reagents in a PEMFC in Operation, Part II: Wet Gases.
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Effect of a Rigid Gas Diffusion Media Applied as Distributor of Reagents in a PEMFC in Operation, Part II: Wet Gases.

机译：在操作中，在PEMFC中用作试剂分配器的刚性气体扩散介质的作用，第二部分：湿气。

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Several mass transport phenomena occur during the operation of a PEMFC each one generates aresistance implying limitations during operation. The humidity in the reactive gas flows promotes theconductivity of the electrolyte membrane but increases the transport limitations at high currentdensities. The reactive gases are distributed in a conventional PEMFC by distributors with serpentine- shaped channel, transversely covering the surface of the electrodes. This paper applies and compares arigid gas diffusion media as gas distributor, its porosity comprises mostly of macropores, their functionis improve the gases reaction distribution with the aim of reducing resistance to mass transport, in turncollects (in the anode) or distributes (on the cathode) electrons generated in the reaction sites. Theresults determine a complex mass transport processes in the porous media when the reagents aremoistened, however at pressures greater than 10 psig, the functionality of the PEMFC is increasedsignificantly to moisture conditions in the reagents flow and it is very favorable for the case ofconventional PEMFC design. The combined effect Pressure - Humidity reduces ohmic limitations tomedium current densities, while the flow rate allows a reduction in transport resistance at high currentdensities. The presence of heavy metals in the structure of the commercial electrodes may generateover-potentials in the cell with capacity to affect the functionality of PEMFC..
机译：PEMFC在运行过程中会发生多种传质现象，每一种都会产生电阻，这意味着在运行过程中会受到限制。反应气流中的湿度促进了电解质膜的导电性，但增加了高电流密度下的传输限制。反应气体在传统的PEMFC中通过带有蛇形通道的分布器分布，横向分布在电极表面。本文应用并比较了刚性气体扩散介质作为气体分配器的情况，其孔隙率主要由大孔组成，它们的作用是改善气体反应分布，从而降低对物质传输的阻力，进而在阳极收集或分布（在阴极） ）在反应位点产生的电子。结果确定了当试剂被润湿时多孔介质中的复杂的传质过程，但是在大于10 psig的压力下，PEMFC的功能性随试剂流动中的水分条件而显着增加，这对于常规的PEMFC设计非常有利。压力-湿度的综合作用降低了对中等电流密度的欧姆限制，而流速允许在高电流密度下降低运输阻力。商业电极结构中重金属的存在可能会在电池中产生过电势，从而影响PEMFC的功能。

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