Proton transfer in SrCeO3-based oxide with internal reformation under supply of CH4 and H2O
Proton transfer in SrCeO3-based oxide with internal reformation under supply of CH4 and H2O
复制标题
在 CH4 和 H2O 供应下进行内部重整的 SrCeO3 基氧化物中的质子转移
DOI：
10.1016/j.jnucmat.2005.08.002
复制
发表时间：
2006
影响因子：
3.1
通讯作者：
Ken Onoda
中科院分区：
文献类型：
--
作者：
S. Fukada;Shigenori Suemori;Ken Onoda
实验研究了在CH 4 +H2O供给条件下，质子传导陶瓷内重整的质荷传递特性，并将其应用于聚变堆燃料冷却系统。本实验中使用的氧化物为SrCe0.95Yb0.05O3-a，电极由Ni-SiO2糊和Ni丝网构成。该系统的描述为CH 4 +H2O <$Ni <$SrCe0.95Yb0.05O3 −a <$NiO <$O2 +H2O。在不同的H2O/CH 4浓度比和温度（600-800°C）条件下，绘制了I-V特性曲线。结果表明，即使不使用任何外部CH 4重整器，该系统也能很好地工作。实验研究了多孔镍电极上、电极内以及陶瓷电解质中的传质过程。用能谱仪在扫描电镜下对多孔电极进行了全表面扫描，确定了多孔电极中碳沉积的分布。在多孔镍电极上，不同位置的CH 4/H2直接分解反应与水蒸气重整反应的比例不同。
Mass and charge transfer in a proton-conducting ceramic with internal reformation under the supply of CH4+H2O was experimentally investigated for application to a fuel detritiation system of a fusion reactor. The oxide used in the present experiment was SrCe0.95Yb0.05O3−a, and the electrodes were composed of Ni–SiO2paste and Ni wire mesh. The system was described by CH4+H2O∣Ni∣SrCe0.95Yb0.05O3−a∣NiO∣O2+H2O. Plots of the I–V (electric current density versus cell potential) characteristic curve were determined under the conditions of different H2O/CH4concentration ratios and temperatures of 600–800°C. It was found that the system could work well even without any external CH4reformer. Mass-transfer process in/on the porous Ni electrode and in the ceramic electrolyte was experimentally clarified. The distribution of carbon depositions in the porous electrode was also determined with EDX by scanning over entire surface in the scope of SEM. The ratio of CH4to H2direct decomposition to its steam-reforming reaction was found to be different from location to location in the porous Ni electrode.