Analysis of effective surface area for electrochemical reaction derived from mass transport property
Analysis of effective surface area for electrochemical reaction derived from mass transport property
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DOI：
10.1016/j.jelechem.2014.09.023
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发表时间：
2014-11-15
影响因子：
4.5
通讯作者：
Kucernak, Anthony R.
中科院分区：
文献类型：
--
作者：
Iden, Hiroshi;Kucernak, Anthony R.
以传质性能为探针，分析了铂电极上电化学反应的有效表面积S-Ef。这个参数不同于所谓的电化学表面积(ECA)，后者通常由欠潜在沉积的质子数量H-UPD或通过CO剥离获得。分析采用了实验和数值两种方法。在实验中，使用了旋转圆盘电极(RDE)，在铂表面可以部分被铂氧化物或CO覆盖的条件下。在数值分析中，采用了基于扩散、对流和对流扩散的三种传质模型。结果发现，在高转速下，可以通过Koutecky-Levich斜率的变化来估计自旋。分析表明，从相对较低的电势(约0.4V)开始，SEff确实显著下降，尽管在测量电流中并不明显，因为这种影响被低的质量输运率所掩盖。分析还表明，不同的方法，即从铂氧化物的量估计和从传质性质得出的分析，对SEF有很大的不同。(C)2014爱思唯尔B.V.保留所有权利。
The effective surface area, S-eff, for electrochemical reaction at a Pt electrode was analyzed using mass transport property as a probe. This parameter is different to the so-called electrochemical surface area (ECA), which is usually obtained from the amount of protons which are underpotentially deposited, H-UPD, or by CO stripping. The analysis was done using both experimental and numerical methods. In experiments, a rotating disk electrode (RDE) was used under the conditions where the Pt surface can be partially covered by Pt oxides or CO. For numerical analysis, three mass transport models based on diffusion, convection and convective-diffusion were used. As a result, it was found that it is possible to estimate Self from the change in Koutecky-Levich slope at high rotation speeds. The analysis suggests that Seff does decrease notably from relatively low potential (around 0.4 V), even though it is not obvious in measured currents as the effect is masked by the low rates of mass transport. The analysis also suggests that there is a large difference in Seff with different methods, namely, estimation from the amount of Pt oxides and the analysis derived from mass transport property. (C) 2014 Elsevier B.V. All rights reserved.