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首页> 外文期刊>Journal of Catalysis >Surface Properties and Physicochemical Characterizations of a New Type of Anode Material, La_(1-x)Sr_xCr_(1-y)O_(3-delta), for a Solid Oxide Fuel Cell under Methane at Intermediate Temperature
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Surface Properties and Physicochemical Characterizations of a New Type of Anode Material, La_(1-x)Sr_xCr_(1-y)O_(3-delta), for a Solid Oxide Fuel Cell under Methane at Intermediate Temperature

机译：甲烷中温下固体氧化物燃料电池新型阳极材料La_（1-x）Sr_xCr_（1-y）O_（3-delta）的表面性质和理化特性

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摘要

In order to develop a new anodic material for a solid oxide fuel cell (SOFC) operated under methane, we studied lanthanum chromites doped with stronium and ruthenium. Ruthenium is an excellent catalyst for methane steam reforming but its use is limited by its cost and evaporation as RuO_x at high temperature. To stabilize the ruthenium, we inserted it into the perovskite to form La_(1-x)Sr_xCr_(1-y)Ru_yO_3. XRD, SEM, TPR, and EDX analyses revealed the stability of ruthenium in the perovskite, in the tetravalent state. The composition was homogeneous in the entire volume of the electrode. Nevetheless, XPS analyses indicated a strontium segregation for a thickness lower than 5 nm. The EDX analyses also showed a strontium concentration gradient near the subsurface. The main result was that no loss of ruthenium was detected even after treatments under air at 1100 deg C. The strontium doping allows the stabilization of the ruthenium in the perovskite in the tetravalent state.
机译：为了开发用于在甲烷下运行的固体氧化物燃料电池（SOFC）的新型阳极材料，我们研究了掺有锶和钌的亚铬酸镧。钌是甲烷蒸汽重整的极佳催化剂，但其使用受到成本和高温下RuO_x蒸发的限制。为了稳定钌，我们将其插入钙钛矿中以形成La_（1-x）Sr_xCr_（1-y）Ru_yO_3。 XRD，SEM，TPR和EDX分析表明，钌在钙钛矿中的稳定性处于四价状态。该组合物在电极的整个体积中是均匀的。但是，XPS分析表明锶的偏析厚度小于5 nm。 EDX分析还显示了地下附近的锶浓度梯度。主要结果是，即使在1100摄氏度的空气中进行处理后，也未检测到钌的损失。锶的掺杂使钙钛矿中的钌稳定在四价态。

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