Fabrication of Proton Conducting Oxide Film with High Conductivity

本课题旨在构建在中温条件下工作的氢-空气燃料电池。为了降低操作温度，燃料电池由薄的质子导电氧化物电解质和透氢膜阳极构成。在这项工作中，我们首先考察了渗透氢金属膜在燃料电池阳极中的适用性。然后，我们评估了由金属膜阳极支撑的薄电解质组成的燃料电池的性能。除电压损失外，透氢金属膜阳极的性能与多孔镍阳极相似。采用脉冲激光烧蚀方法，在可透氢金属基底上制备了用于燃料电池电解液的bace_ <0.9>Y_<0.1>O_<2.95>薄膜。得到了厚度为1.5 ~ 2.0μm的电解液（BaCe_<0.9>Y_<0.1>O_<2.95>）和厚度为25 μm的透氢钯阳极（Pd阳极）在400℃下稳定工作，开路电压为0.86 V，功率密度为0.52 mW/cm^2的燃料电池。

This work aims to construct the hydrogen-air fuel cells, which operate at intermediate temperature. In order to reduce the operation temperature, the fuel cells are constructed from a thin proton conducting oxide electrolyte and a hydrogen-permeable membrane anode. In this work, we examine at first the applicability of the hydrogen-permeable metal membrane for the anode in the fuel cell. Then, we evaluated the performance of the fuel cells consisting of the thin electrolyte supported by the metal membrane anode.It is recognized that the hydrogen-permeable metal membrane anode works well similar to the porous Ni anode except the voltage loss. The voltage loss for the fuel cell with the Pd anode is lower than that for the fuel cell with the porous Ni anode.BaCe_<0.9>Y_<0.1>O_<2.95> films, which are used for the electrolyte in the fuel cells, are prepared by the pulsed laser ablation method on the hydrogen-permeable metal substrates used as the anode. The fuel cells with the BaCe_<0.9>Y_<0.1>O_<2.95> electrolyte of 1.5〜2.0μm thickness and the hydrogen-permeable Pd anode of 25 μm thickness operate stably giving an open circuit voltage of 0.86 V at 400℃ and the power density of 0.52 mW/cm^2 is derived.