活化极化

利用流体力学计算软件FLUENT建立平板状固体氧化物燃料电池（SOFC）三维数值模型，研究在不同操作条件和支撑形式下，活化极化、欧姆极化、浓度极化对SOFC性能的影响。

A three-dimensional model of a planar solid oxide fuel cell ( SOFC ) was developed with hydrodynamics computation software FLUENT and then used to predict the effect of activation polarization 、 ohm polarization and concentration polarization on the performance of SOFC .

实验结果表明，在800℃下阳极支撑SOFC的活化极化和欧姆极化均小于电解质支撑SOFC，输出功率密度也提高了0.05W/cm2，达到0.13W/cm2。

The experimental results show anode support SOFC has lower activation polarization and diffusing polarization than electrolyte-supported SOFC in 800 ℃ . The cell output density also increases 0.05 W / cm2 , is up to 0.13 W / cm2 .

通过电极动力学参数的比较，发现氧电化还原在合金催化剂上的交换电流密度比Pt／C催化剂上的提高了2倍，减小了氧电极的活化极化，提高了催化剂的抗烧结能力。

By the contrast of the two kinds of catalysts ' electrode kinetic parameters , we find that the exchange current density of cathode doubled .

研究不同结构设计条件下，活化极化、欧姆极化、浓差极化对SOFC性能的影响。

The effects of activation , ohmic and concentration polarization on the overall performance of SOFC were studied under different designs .

结果表明，腐蚀速率受活化极化控制，腐蚀速率和缓蚀率均随温度的升高而增加，六亚甲基四胺在A3钢表面的吸附符合Freundlich等温方程式。

The results show that corrosion rate controlled by activated polarization , both corrosion rate and inhibition rate will increase with ascension of temperature , the adsorption of hexamethylene tetramine at the surface of A 3 steel conform oneself to Freundlich 's isothermic equation .

多孔电极极化理论&Ⅱ.有欧姆极化的电极稳态的解和导电特征电流模型中考虑了造成电池输出损失的三种极化现象：欧姆极化、活化极化和浓差极化。

Theory of Polarization of Porous Electrodes The model includes all the three polarizations : ohmic , activation and concentration polarization .

其主要机制为：脉冲电化学去污主要利用了电流的脉冲张弛从而增加电极活化极化降低阳极的浓差极化。

The main mechanism bases on the characteristic of pulse power of which electrodes are activated and difference is reduced in concentration because of relaxation of current .

电池工作温度对各种极化损失尤其是阳极活化极化产生重要影响。

The working temperature has a decisive effect on the various polarization losses , especially for the anode activation polarization , which indicates that the anode surface reaction rate is a key factor .

对一个活化极化控制的腐蚀体系，其腐蚀金属电极的弱极化曲线方程式包含3个电化学动力学参数，但同时测定出这些动力学参数还是一个棘手的问题。

There are three electrochemical kinetic parameters in the weak polarization curve equation of corroding systems controlled by activation polarization , but it is difficult to estimate all these parameters at the same time .

得出结论碳钢海洋大气腐蚀的阴极过程由浓差极化和活化极化混合控制；黄铜海洋大气腐蚀由阴极氧扩散步骤控制。

The results indicated that cathodic process of carbon steel under marine atmosphere was controlled by concentration polarization and active polarization , while the corrosion process of brass was controlled by the process of cathodic oxygen diffusion .

17-4PH不锈钢的耐蚀性好，腐蚀期长，具有活化-化金属极化曲线的特征，但钝化电位范围较窄，耐点蚀性能较差。

The 17-4 PH stainless steel has good anticorrosive properties and the long corrosion period . It has an activation-passivation polarization curve , but the passivation potential range is narrow . The spot corrosion is relatively easy to occur .

活化的巨噬细胞会发生功能上极化，但是在SLE疾病过程中活化巨噬细胞的极化类型和机制并不清楚。

But the concrete phenotype and the mechanism for functional polarization of the activated macrophages during pathogenesis of SLE remains unknown .