首页> 外文会议>5th International Symposium on Carbonate Fuel Cell Technology, 5th, Oct 18-19, 1999, Honolulu, HL >Investigations to the rate determining step of the Oxygen Reduction Reaction of MCFC-Cathodes
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Investigations to the rate determining step of the Oxygen Reduction Reaction of MCFC-Cathodes

机译:MCFC-阴极氧还原反应速率确定步骤的研究

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The main problem of MCFC-performance results from the oxygen-reduction reaction at the Cathode. This reaction takes place in 3-6 stages and at this moment it is unknown, which stage is realy the rate determining step (r.d.s.).However, the knowledge of the r.d.s gives some possibilities to construct Cathodes with lower polarisation resistance for MCFC with higher performance. We investigate standard NiO-Cathodes, NiO/LiCoO_2-Double-Layer-Cathodes (DLC) and a modified DLC by stationary U-i-treatment and by impedance-measurement. Furthermore, we determined the reaction order for O_2 and CO_2 in dependence of the temperature and the filling stage of carbonate melt. For standard NiO-Cathodes, we were able to verify the results of Yuh and Selman. For the DLC we pointed out a new path for the Oxygen reduction reaction, parallel to the "Superoxide (Peroxide)-Path". To enhance this reaction path, we have modificated the DLC. For these cathodes we obtain a new r.d.s. for the generation of O~(2-)-ions as precursor of the carbonate-ions.
机译:MCFC性能的主要问题是由阴极处的氧还原反应引起的。该反应分3-6个阶段进行,目前尚不清楚,哪个阶段是速率确定步骤(rds)。然而,rds的知识为构建具有较高极化强度的MCFC的阴极提供了一些可能性性能。我们研究了标准的NiO阴极,NiO / LiCoO_2-双层阴极(DLC)和通过固定U-i处理和通过阻抗测量的改良DLC。此外,我们根据温度和碳酸盐熔体的填充阶段确定了O_2和CO_2的反应顺序。对于标准的NiO阴极,我们能够验证Yuh和Selman的结果。对于DLC,我们指出了氧还原反应的新路径,与“超氧化物(过氧化物)路径”平行。为了增强此反应路径,我们修改了DLC。对于这些阴极,我们获得了一个新的r.d.s.用于产生作为碳酸根离子前体的O〜(2-)离子。

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