Stainless steel bipolar plates (BPs) fabricated using innovative additive manufacturing techniques can improve fuel cell performance and reduce costs. A high current density can be obtained using a low-cost membrane electrode assembly (MEA) with low platinum (Pt) loading at the anode, along with BPs with rectangular micro channels. Three types of BPs of serpentine flow field are designed after varying the width of the rectangular channel. Two types of MEAs are used. First is 0.12 mg cm⁻² Pt loading at anode, and the second is 0.50 mg cm⁻². Wherein MEA with Pt loading at 0.12 mg cm⁻² is used, a high current density is obtained as the channel width decreases. The BP with 300 µm channels has a current density of 1.205 A cm⁻², which is higher by 31.4% than that of BP with 500 µm channels and higher by 70.2% than that of the BP with 940 µm channels. However, when the MEA with Pt loading at 0.50 mg cm⁻² is applied to the test, the opposite results are obtained: As the channel width becomes narrow, the current density decreases. In the long-term operation, a similar trend in the current density as that of the short-term operation is observed.

中文翻译：

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通过增材制造具有矩形微通道的不锈钢双极板：通道宽度对燃料电池性能的影响

使用创新增材制造技术制造的不锈钢双极板 (BP) 可以提高燃料电池性能并降低成本。使用阳极铂 (Pt) 负载量低的低成本膜电极组件 (MEA) 以及具有矩形微通道的 BP 可以获得高电流密度。改变矩形通道宽度后，设计了三种类型的蛇形流场BP。使用两种类型的 MEA。第一个是阳极负载0.12 mg cm ^{-2 的Pt，第二个是0.50 mg cm -2}。其中使用Pt负载量为0.12mg cm ^-2的MEA ，随着沟道宽度减小，获得高电流密度。300μm通道的BP的电流密度为1.205A cm ^-2，比500μm通道的BP高31.4%，比940μm通道的BP高70.2%。^{然而，当将Pt负载量为0.50 mg cm -2}的MEA应用于测试时，得到相反的结果：随着沟道宽度变窄，电流密度降低。在长期操作中，观察到与短期操作类似的电流密度趋势。