可逆固体氧化物电池氢电极的制备及性能

Preparation and Performance of Hydrogen Electrode for Reversible Solid Oxide Cells Application

通过调整相转化-流延过程中石墨浆料和氧化镍-氧化钇稳定氧化锆浆料的位置,获得单层直孔和双层直孔/海绵状孔两种结构氢电极,并结合浸渍涂敷、丝网印刷、高温烧结等技术制成氢电极支撑固体氧化物电池。当氢电极和氧电极分别暴露于67%CO2-33%CO (体积分数)和空气时,700℃、开路条件下2种电池的电极极化电阻分别为1.03 (单层)和1.60Ω·cm^2(双层);且前者的电解性能和输出性能均优于后者,这可能的原因是单层结构氢电极优异的气体渗透性能有利于CO2-CO混合气在电极内的传输,有效地降低了电池的气体传输电阻。

Two hydrogen electrodes were obtained via the change of the positions of graphite and NiO-yttria-stablized-zirconia slurries in a phase-inversion co-tape casting process. One hydrogen electrode is a single-layer electrode with larger straight pores, and another is a straight pores/sponge-like pores dual-layer electrode, and the corresponding hydrogen electrode supported solid oxide cells are prepared by combining dip-coating, screen-printing and high temperature sintering method. When the hydrogen electrode and the oxygen electrode of reversible solid oxide cells were exposed to 67%CO2-33%CO(volume fraction) and ambient air, respectively, the electrode polarization resistance for the single-layer electrode supported cell is 1.03Ω·cm^2, which is lower than that for the dual-layer electrode supported cell(i.e., 1.60Ω·cm^2). In addition, in both solid oxide fuel cell and solid oxide electrolysis cell modes, the electrochemical properties for the single-layer electrode supported cell is also better than the dual-layer electrode supported cell. This could be attributed to the greater gas permeability and lower diffusion resistance of CO2-CO in the single-layer electrode.