【摘要】：直接甲酸燃料電池作為新興的高效清潔能源技術(shù),由于其燃料甲酸具有無毒、不易燃、電化學(xué)氧化性能好、Nafion膜滲透率低等優(yōu)點(diǎn),正受到越來越多的關(guān)注。目前對于直接甲酸燃料電池的研究主要集中在陽極催化劑的制備和載體的選擇,然而,甲酸的強(qiáng)腐蝕性對雙極板性能的影響卻鮮有報(bào)道。本文探索了 316L不銹鋼作為直接甲酸燃料電池雙極板的電化學(xué)性能及恒電位極化前后的接觸電阻,同時(shí)對316L不銹鋼進(jìn)行表面改性,以提高其在直接甲酸燃料電池工作環(huán)境中的電化學(xué)性能。主要工作和結(jié)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)的模擬DFAFC陽極環(huán)境和50℃,0.05 mol/L H_2SO_4 + 2 ppm HF通入空氣模擬DFAFC陰極環(huán)境中,對316L不銹鋼進(jìn)行電化學(xué)測試,并測量恒電位極化前后的接觸電阻,316L不銹鋼的接觸電阻值達(dá)到550.2 mΩ·cm~2。2.采用等離子表面合金化技術(shù)在316L不銹鋼表面制備出了鈮和鈮氮化物的合金化滲擴(kuò)改性層。得到的改性層均勻致密,沒有微孔、裂紋等缺陷,實(shí)現(xiàn)了與基體良好的冶金結(jié)合。在模擬DFAFC環(huán)境中,上述改性層均提高了 316L不銹鋼的耐腐蝕性,降低了腐蝕電流密度和接觸電阻,表現(xiàn)出較好的穩(wěn)定性。其中鈮改性層和鈮氮化物改性層使得316L不銹鋼基體的接觸電阻分別下降到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，

本文編號：2451809