0引言
金刚石是自然界中硬度最高的材料.1985年,美国Berkeley大学Marvin L. Cohen教授根据一个对物质的弹性模量具有普遍意义的半经验公式,推断碳氮化合物硬度可能超过金刚石,这种共价化合物的晶体结构类似于氮硅共价化合物β-Si3N4,被...0引言
金刚石是自然界中硬度最高的材料.1985年,美国Berkeley大学Marvin L. Cohen教授根据一个对物质的弹性模量具有普遍意义的半经验公式,推断碳氮化合物硬度可能超过金刚石,这种共价化合物的晶体结构类似于氮硅共价化合物β-Si3N4,被称为β-C3N4[1].展开更多
Although metallic interconnects have many advantages,the formation of Cr2O3 scale and the evaporation of Cr(Ⅵ)species from alloys will greatly degrade the solid oxide fuel cell(SOFC)performance.In this paper,the elec...Although metallic interconnects have many advantages,the formation of Cr2O3 scale and the evaporation of Cr(Ⅵ)species from alloys will greatly degrade the solid oxide fuel cell(SOFC)performance.In this paper,the electrochemical impedance spectroscopy(EIS)and the cathode polarization method of galvanostatic current interruption were employed to investigate the deposition mechanism of chromium with the electrochemical behavior of LSM cathode in the presence of chromia-forming alloys.The results show that the dissociative adsorption and the diffusion of oxygen on the LSM surface were inhibited by the gaseous chromium species and the migration processes of oxygen ions into YSZ electrolyte were inhibited by the solid chromium species deposited on the YSZ surface.展开更多
文摘Although metallic interconnects have many advantages,the formation of Cr2O3 scale and the evaporation of Cr(Ⅵ)species from alloys will greatly degrade the solid oxide fuel cell(SOFC)performance.In this paper,the electrochemical impedance spectroscopy(EIS)and the cathode polarization method of galvanostatic current interruption were employed to investigate the deposition mechanism of chromium with the electrochemical behavior of LSM cathode in the presence of chromia-forming alloys.The results show that the dissociative adsorption and the diffusion of oxygen on the LSM surface were inhibited by the gaseous chromium species and the migration processes of oxygen ions into YSZ electrolyte were inhibited by the solid chromium species deposited on the YSZ surface.
