Application of Nickel-Titania Cermets to Zirconia Solid Oxide Fuel Cells

镍钛金属陶瓷在氧化锆固体氧化物燃料电池中的应用

基本信息

批准号：
07650833
负责人：
TAIMATSU Hitoshi
金额：
$ 1.6万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650833/
关键词：
fuel cell cermet nickel titania anode electrical conductivity displacement reaction

项目摘要

In the first place, preparation technology for nickel/titania cermets suitable for anode in solid oxide fuel cells (SOFC), especially porosity control, has been established, and thermal expansivity, mechanical strength, electrical conductivity and gas permeability has been measured. Cermets were obtained by the displacement reaction between NiO and Ti powders, 2NiO + Ti = 2Ni + TiO_2. Microstructure of the cermets became finer with decreasing the annealing temperature. Porosity decreased with increasing the applied pressure in dieforming and the annealing temperature. Mechanical strength was related only to porosity. The strength became higher with increasing the porosity and was 100 MPa at 30 %. The electrical conductivity at a porosity of 36.8 % was 1000 Scm^<-1>. The gas permeability was sufficiently high for SOFC and was in the range 10^<-2> to 10^<-3> cm^4g^<-1>s^<-1> at a porosity of 30 to 40 %.Electrode performance of cermets obtained by the established method has been tested using the samples on which films of ZrO_2 - 8 mol % Y_2O_3 (YSZ) were plasma-sprayd. Electrode conductivity increased with increasing the temperature and the PH_2O/PH_2 ratio, and reached 150 Scm^<-2> at 1000ﾟC in a H_2 - H_2O (30ﾟC) mixture. Cermets did not react with YSZ films at 1000ﾟC.Therefore, this cermet was applicable to SOFC.

首先，已经确定了适合镍/二氧化钛Cermets的制备技术，适用于固体氧化物燃料电池中的阳极（SOFC），尤其是孔隙率控制，并且已经测量了热膨胀，机械强度，电导率和气体通透性。通过NIO和Ti粉末之间的位移反应获得Cermet，2NiO + Ti = 2Ni + TiO_2。随着退火温度的降低，Cermets的微观结构变得更加精细。孔隙率随着dieforming和退火温度的增加压力而提高。机械强度仅与孔隙率有关。随着孔隙率的增加，强度变得更高，为100 MPa，为30％。孔隙率为36.8％的电导率为1000 SCM^<-1>。 SOFC的气体渗透性足够高，在10^<-2>至10^<-3> cm^4g^4g^<-1> s^<-1>以30％至40％的孔隙率的孔隙率的孔隙率的孔隙率的30至40％。通过已建立方法获得的Cermets的电极性能，已使用Zro_2-8 mol％ways的样品进行了测试。电极电导率随着温度和pH_2O/PH_2比的增加而增加，并在H_2 -H_2 -H_2O（30 ﾟC）混合物中达到1000°C时达到150 scm^<-2>。 Cermets在1000 ﾟC中与YSZ膜没有反应。因此，此Cermet适用于SOFC。