微波—微乳法制備燃料電池催化劑的研究
發(fā)布時(shí)間：2018-12-21 16:00
【摘要】： 現(xiàn)在新型制備方法的研究對于燃料電池催化劑的性能的提升變得十分重要。本文利用微波多元醇的方法合成了高分散的Pt/C催化劑并研究了不同制備條件對催化劑性能的影響。接著以碳納米管作為催化劑載體,用微波加熱法合成了Pt和Pt-Ru二元金屬催化劑。初步探討了將微波和微乳相結(jié)合的方法用于制備Pt-Ru二元合金催化劑。得到了如下結(jié)論: 1.本論文通過加入醋酸鈉,調(diào)節(jié)溶液pH值,改變催化劑的鉑碳質(zhì)量比,對碳載體進(jìn)行預(yù)處理制備了Pt/C催化劑。利用XRD,TEM,SEM-EDS,CV等手段對制備的納米粒子的粒徑,表面形貌,元素比例以及電催化性能進(jìn)行了分析表征。實(shí)驗(yàn)結(jié)果證明添加0.6ml醋酸鈉,調(diào)節(jié)pH值至10,硝酸處理碳載體,鉑質(zhì)量含量為40%的條件下所制備的催化劑具有最均勻的Pt納米粒子粒徑分布和最佳催化性能。 2.本論文以改性后的碳納米管(CNTs)作為載體制備了催化劑。通過XRD,FTIR以及CV等手段進(jìn)行了表征。結(jié)果證明,以碳納米管作為載體要優(yōu)于碳粉。碳納米管經(jīng)過酸處理改性后,紅外測試證明其表面接枝了許多羥基和羧基官能團(tuán)。酰胺化處理使其表面接枝上了酰胺基團(tuán)。負(fù)載Pt催化劑后其甲醇峰電流密度分別達(dá)到580Ag-1Pt和600Ag-1Pt。XRD測試證明Pt-Ru合金納米粒子的平均粒徑為5.2nm。SEM-EDS測試表明Pt與Ru的元素物質(zhì)的量之比與理論值相符合。催化劑的甲醇氧化電流峰值達(dá)到6.15mA,其氧化峰的起始電位比一元Pt催化劑的更低。 3.將微波法和微乳法相結(jié)合制備Pt-Ru二元催化劑。催化劑經(jīng)170℃,250℃,600℃處理后粒徑在5.2nm,5.5nm和7.1nm左右。TEM測試表明,制備的催化劑納米粒子具有良好的分散性。經(jīng)250℃熱處理后,納米粒子的粒徑大概在5nm左右。通過SEM-EDS測試了Pt:Ru的物質(zhì)的量之比,結(jié)果與理論值相符。通過控制加料順序使納米粒子中的成分得到很好的控制。循環(huán)伏安測試表明,不同的溫度下,250℃熱處理的催化劑催化性能最好,而在triton-100/異丙醇/環(huán)己烷/乙二醇的微乳體系中制備的Pt-Ru催化劑具有最佳的電催化性能。
[Abstract]:The research of new preparation methods is very important for improving the performance of fuel cell catalysts. In this paper, the highly dispersed Pt/C catalyst was synthesized by microwave polyol method and the effect of different preparation conditions on the catalyst performance was studied. Then Pt and Pt-Ru binary metal catalysts were synthesized by microwave heating using carbon nanotubes as catalyst carrier. The method of microwave and microemulsion was used to prepare Pt-Ru binary alloy catalyst. The conclusions are as follows: 1. In this paper, the Pt/C catalyst was prepared by adding sodium acetate, adjusting the pH value of the solution and changing the platinum / carbon mass ratio of the catalyst. The particle size, surface morphology, elemental ratio and electrocatalytic properties of the prepared nanoparticles were characterized by XRD,TEM,SEM-EDS,CV. The experimental results show that the catalyst prepared by adding 0.6ml sodium acetate, adjusting pH to 10, treating carbon carrier with nitric acid and platinum content of 40% has the most uniform particle size distribution and the best catalytic performance of Pt nanoparticles. 2. In this thesis, the modified carbon nanotube (CNTs) was used as the support to prepare the catalyst. It was characterized by XRD,FTIR and CV. The results show that carbon nanotubes are better than carbon powder. After modified by acid treatment, the surface of carbon nanotubes was grafted with many hydroxyl and carboxyl functional groups. The amide group was grafted on the surface by amidation. The methanol peak current density of the supported Pt catalyst reached 580Ag-1Pt and 600Ag-1Pt.XRD respectively. The average particle size of the Pt-Ru alloy nanoparticles was 5.2nm.SEM-EDS. The results showed that the ratio of the content of Pt to the element substance of Ru was higher than that of Pt. In accordance with the theoretical values. The peak value of methanol oxidation current of the catalyst is 6.15mA.The initial potential of the oxidation peak of the catalyst is lower than that of the monolithic Pt catalyst. 3. Pt-Ru binary catalyst was prepared by microwave method and microemulsion method. The catalyst was treated at 170 鈩，
本文編號(hào)：2389132
[Abstract]:The research of new preparation methods is very important for improving the performance of fuel cell catalysts. In this paper, the highly dispersed Pt/C catalyst was synthesized by microwave polyol method and the effect of different preparation conditions on the catalyst performance was studied. Then Pt and Pt-Ru binary metal catalysts were synthesized by microwave heating using carbon nanotubes as catalyst carrier. The method of microwave and microemulsion was used to prepare Pt-Ru binary alloy catalyst. The conclusions are as follows: 1. In this paper, the Pt/C catalyst was prepared by adding sodium acetate, adjusting the pH value of the solution and changing the platinum / carbon mass ratio of the catalyst. The particle size, surface morphology, elemental ratio and electrocatalytic properties of the prepared nanoparticles were characterized by XRD,TEM,SEM-EDS,CV. The experimental results show that the catalyst prepared by adding 0.6ml sodium acetate, adjusting pH to 10, treating carbon carrier with nitric acid and platinum content of 40% has the most uniform particle size distribution and the best catalytic performance of Pt nanoparticles. 2. In this thesis, the modified carbon nanotube (CNTs) was used as the support to prepare the catalyst. It was characterized by XRD,FTIR and CV. The results show that carbon nanotubes are better than carbon powder. After modified by acid treatment, the surface of carbon nanotubes was grafted with many hydroxyl and carboxyl functional groups. The amide group was grafted on the surface by amidation. The methanol peak current density of the supported Pt catalyst reached 580Ag-1Pt and 600Ag-1Pt.XRD respectively. The average particle size of the Pt-Ru alloy nanoparticles was 5.2nm.SEM-EDS. The results showed that the ratio of the content of Pt to the element substance of Ru was higher than that of Pt. In accordance with the theoretical values. The peak value of methanol oxidation current of the catalyst is 6.15mA.The initial potential of the oxidation peak of the catalyst is lower than that of the monolithic Pt catalyst. 3. Pt-Ru binary catalyst was prepared by microwave method and microemulsion method. The catalyst was treated at 170 鈩，
本文編號(hào)：2389132
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