本文選題：固體氧化物電解池　切入點：納米陣列　出處：《中國地質(zhì)大學(北京)》2015年碩士論文

【摘要】：固體氧化物電解池是一種新型的能源利用方式,可以將電能轉(zhuǎn)化為化學能,且具有高效、清潔的優(yōu)點�，F(xiàn)有的固體氧化物電解池多為無序化的多孔復合陶瓷結(jié)構(gòu),存在電極強電化學極化、強濃差極化、原料氣轉(zhuǎn)化率低以及短壽命的關(guān)鍵科學問題。此外,傳統(tǒng)的SOEC以YSZ為電解質(zhì)、Ni-YSZ為氫電極、LSM-YSZ為氧電極,由于LSM-YSZ氧電極的氧離子電導率過低,而具有混合電導的LSCF氧電極材料因具有更高的催化活性和更高的電導率而受到廣泛關(guān)注。本論文主要分為兩部分。第一部分為固體氧化物電解池中有序化納米電解質(zhì)材料的制備工作。本部分通過采用多種水熱、電泳、溶膠凝膠和熱壓等制備方法,借以容易除去的AAO模板,制備有序化的YSZ納米陣列。結(jié)果表明通過溶膠凝膠-模板法成功制備了高度有序化的YSZ納米陣列,為后期納米陣列電極的制備提供了良好基礎。第二部分為以LSCF-GDC(La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O1.95)為氧電極的固體氧化物電解池堆(30單元10×10 cm2的平板式電解池堆)的電解性能測試。在不同的操作溫度、氣體流量和水蒸氣含量等實驗條件下進行了電解水蒸氣研究,并在前人的基礎之上建立了電解水蒸氣的電化學模型和系統(tǒng)效率模型主要得出了以下結(jié)論:高溫有利于歐姆極化和電化學極化降低;高水蒸氣含量能明顯的降低電化學活化極化損失;氫氣極氣體的流量則對降低濃差損失作用明顯;向氧氣極通入空氣能顯著的降低電化學極化損失,但是純氮氣的通入?yún)s使電化學極化損失增加。通過計算不同實驗條件下高溫電解水蒸氣實驗的系統(tǒng)效率,結(jié)果發(fā)現(xiàn):高溫、高水蒸氣含量、高氣體流量及氧電極空氣的通入雖然能降低極化損失,減少電解所需的電能,但是同時也增加了加熱氣體所需的能量;經(jīng)對比發(fā)現(xiàn),在800℃氧氣極不通入氣體,氫氣極通入6 L·min-1濕度為90%氫氣,電流密度為0.323 A·cm-2時,系統(tǒng)效率最大為80.8%。
[Abstract]:Solid oxide electrolysis cell is a new type of energy utilization method, which can convert electric energy into chemical energy, and has the advantages of high efficiency and cleanliness. There are some key scientific problems such as strong electrochemical polarization, strong concentration polarization, low conversion of raw gas and short life. In addition, the traditional SOEC uses YSZ as electrolyte Ni-YSZ as hydrogen electrode and LSM-YSZ as oxygen electrode, because the oxygen ion conductivity of LSM-YSZ oxygen electrode is too low. However, LSCF oxygen electrode materials with mixed conductance have attracted much attention because of their higher catalytic activity and higher conductivity. This thesis is mainly divided into two parts. The first part is the ordered nanoscale electricity in the solid oxide electrolytic cell. Preparation of pyrolytic materials. Electrophoretic, sol-gel and hot-pressing methods were used to prepare the ordered YSZ nanoarrays by removing the AAO templates easily. The results showed that the highly ordered YSZ nanoarrays were successfully prepared by the sol-gel template method. In the second part, the electrolysis performance of solid oxide electrolytic cell with oxygen electrode as oxygen electrode is measured by using LSCF-GDCA La0.6Sr0.4Co0.2Fe0.8O3- 未 -Ce0.9Gd0.1O1.95 as oxygen electrode. The electrolytic water vapor was studied under the experimental conditions such as gas flow rate and water vapor content. The electrochemical model and system efficiency model of electrolytic water vapor were established on the basis of previous studies. The main conclusions are as follows: high temperature is conducive to the reduction of ohmic polarization and electrochemical polarization; High water vapor content can obviously reduce the polarization loss of electrochemical activation, while the flow rate of hydrogen gas can obviously reduce the loss of concentration, and the loss of electrochemical polarization can be significantly reduced by air flowing into the oxygen pole. However, the input of pure nitrogen increases the electrochemical polarization loss. By calculating the system efficiency of high temperature electrolytic water vapor experiment under different experimental conditions, the results show that: high temperature, high water vapor content, Although the high gas flow rate and the air flow through the oxygen electrode can reduce the polarization loss and reduce the electric energy required for electrolysis, it also increases the energy required to heat the gas. By comparison, it is found that oxygen is extremely impassable at 800 鈩，

本文編號：1666206