J0802-3-3 プロトン伝導体添加SOFC燃料極に関する研究([J0802-3]SOFC(2))

Abstract

A new anode with proton conductor BCY (BaCe_<0.8>Y_<0.2>O_<3-α>) was proposed for a high power solid oxide fuel cell (SOFC). The most striking feature is that, the anode overpotential is reduced to a half of the conventional one, which is Ni/GDC (Gd_2O_3-doped CeO_2), by addition of only a 10% of BCY into GDC. In this case, since the BCY particles could not make a network structure, the BCY particle itself might play an important role on enhancement of reaction and/or hydrogen-adsorption compared with the GDC particle in the anode. In the current study, we focus on adsorption effect of BCY. The amount of absorbed hydrogen and oxygen atom molecule on the different samples (Ni, GDC, YSZ and BCY, which are the general materials of the SOFC anode) was measured by using a Thermal Desorption Spectrometer (TDS). It was disclosed that the BCY particles could adsorb large amount of hydrogen and oxygen on the surface compared with the other materials of anode. It plays an important role in the anodic reaction.