3。3The Distributions of temperature

Fig。 8 shows the distribution of temperature in the ASC stack and the CSC stack。 It is evident that for the ASC stack, temperature is increase along the direction of fuel flow and the lowest temperature is located at the input of channel。 Similar situation can be found in the CSC stack。

However, the highest of the CSC stack is 1027 K is larger than that of the ASC stack。 Compared with the CSC stack, as described above, the performance of the ASC is lower。 As a result, the heat produced by reaction is also lower。 Temperature is one of the most critical factors, since the stack performance rises quickly with increasing temperature。 If temperature is not considered, the advantage of the CSC stack will be underestimated。

Figure 8。 Distribution of temperature for (a) the ASC stack and (b) the CSC stack

3。4Effect of Rib Width

To gain more insight into the performance difference between the ASC stack and the CSC stack, the stack output for a fixed pitch width ( the sum of the rib and the channel width) of 3 mm is examined by varying the rib width。

Fig。 9a shows the relationship between the output current density and the anode rib width。 The output current density of the ASC stack and CSC stack for a fixed rib width of 1。5 mm are respectively 5580 and 7033 A m2, which are 6。4% and 23。5% higher than that of the ASC stack and CSC stack with an anode rib width of 2。1 mm, respectively。 Clearly, the anode rib width has a significant impact on the performance of the ASC stack and the CSC stack。 Similarly, the cell outputs of the ASC stack and CSC stack also vary notably with the cathode rib width, as shown in Fig。 9b。 Compared to the results obtained with a fixed cathode rib width of 2。1 mm, the output current increases by 12。4% and 27。3%

for the ASC stack and the CSC stack respectively with a cathode rib width set as 1。5 mm。 Therefore, a suitable choice of the rib width is very important for realizing the potential of a SOFC stack。

On the other hand, the performance difference between the ASC stack and the CSC stack depends strongly on the rib width。 It is evident that the maximum current density of the CSC stack is larger than that of the ASC stack, as given in Fig。 9a and 9b。 However, the advantage associated with the CSC stack may be greatly reduced, or even lost completely, if the rib width is not chosen appropriately。 For example, for a fixed anode rib width of 2。4 mm, the output current densities of the CSC stack is less than that of the ASC stack。

Figure 9。 The effect of rib width on the stack output current density (a) anode rib width and (b) cathode rib width

3。5Effect of Contact Resistance and Pitch Width

As discussed above, the stack performance is closely related to the anode and cathode rib width。 Thus, the optimal rib width is used in the following, which can be obtained according to the optimal rib width formulae presented in references [13, 39]。本文研究了电池的设计在固体氧化物燃料电池（SOFC）电池堆栈性能的影响。基于三维的数值模拟，它被发现堆栈的性能是强烈依赖于电池该阳极平均电流密度支撑SOFC（ASC）栈只有5580 平方米，从阴极还原20。7%支撑SOFC（CSC）7033平方米堆栈设计。这可以解释为与CSC堆栈相比，ASC栈薄阴极导致较小的有效反应区和较大的阴极电阻损耗。ASC堆栈和CSC栈之间的差异是由不同的肋宽检查，接触电阻和节宽。结果证明具有最佳的肋宽，CSC的堆栈的性能，ASC栈比任何实际的接触电阻和节宽。本文中所提供的分析，有助于理解的影响，电池设计对电池性能的堆栈层通过优化设计的堆栈发挥了充分的潜力。

关键词：固体氧化物燃料电池；阳极支撑电池；阴极支撑电池；堆模型；充氧或气体输运

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