直接甲酸燃料电池316L不锈钢双极板性能研究
发布时间：2019-04-01 19:13
【摘要】：直接甲酸燃料电池作为新兴的高效清洁能源技术,由于其燃料甲酸具有无毒、不易燃、电化学氧化性能好、Nafion膜渗透率低等优点,正受到越来越多的关注。目前对于直接甲酸燃料电池的研究主要集中在阳极催化剂的制备和载体的选择,然而,甲酸的强腐蚀性对双极板性能的影响却鲜有报道。本文探索了 316L不锈钢作为直接甲酸燃料电池双极板的电化学性能及恒电位极化前后的接触电阻,同时对316L不锈钢进行表面改性,以提高其在直接甲酸燃料电池工作环境中的电化学性能。主要工作和结果如下:1.在 50℃,0.05 mol/L H_2SO_4 + 2 ppm HF + x mol/L HCOOH(x= 2,5,10,15 mol/L)的模拟DFAFC阳极环境和50℃,0.05 mol/L H_2SO_4 + 2 ppm HF通入空气模拟DFAFC阴极环境中,对316L不锈钢进行电化学测试,并测量恒电位极化前后的接触电阻,316L不锈钢的接触电阻值达到550.2 mΩ·cm~2。2.采用等离子表面合金化技术在316L不锈钢表面制备出了铌和铌氮化物的合金化渗扩改性层。得到的改性层均匀致密,没有微孔、裂纹等缺陷,实现了与基体良好的冶金结合。在模拟DFAFC环境中,上述改性层均提高了 316L不锈钢的耐腐蚀性,降低了腐蚀电流密度和接触电阻,表现出较好的稳定性。其中铌改性层和铌氮化物改性层使得316L不锈钢基体的接触电阻分别下降到25.9 mΩ·cm~2和7.2 mΩ·cm~2。
[Abstract]:As a new and efficient clean energy technology, direct formic acid fuel cell has attracted more and more attention because of its non-toxic, non-flammable, good electrochemical oxidation performance and low permeability of Nafion membrane. At present, the research of direct formic acid fuel cell mainly focuses on the preparation of anode catalyst and the choice of support. However, the effect of strong corrosion of formic acid on the performance of bipolar plate is rarely reported. The electrochemical performance of 316L stainless steel as a bipolar plate for direct formic acid fuel cell and the contact resistance before and after potentiostatic polarization were investigated. At the same time, the surface modification of 316L stainless steel was carried out. In order to improve its electrochemical performance in direct formic acid fuel cell working environment. The main work and results are as follows: 1. At 50 鈩，
本文编号：2451809
[Abstract]:As a new and efficient clean energy technology, direct formic acid fuel cell has attracted more and more attention because of its non-toxic, non-flammable, good electrochemical oxidation performance and low permeability of Nafion membrane. At present, the research of direct formic acid fuel cell mainly focuses on the preparation of anode catalyst and the choice of support. However, the effect of strong corrosion of formic acid on the performance of bipolar plate is rarely reported. The electrochemical performance of 316L stainless steel as a bipolar plate for direct formic acid fuel cell and the contact resistance before and after potentiostatic polarization were investigated. At the same time, the surface modification of 316L stainless steel was carried out. In order to improve its electrochemical performance in direct formic acid fuel cell working environment. The main work and results are as follows: 1. At 50 鈩，
本文编号：2451809
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