Doped Samarium Ferrite Perovskites as Carbon and Sulfur Resistant Anodes for Low Temperature Solid Oxide Fuel Cells
Doped Samarium Ferrite Perovskites as Carbon and Sulfur Resistant Anodes for Low Temperature Solid Oxide Fuel Cells
复制标题
DOI：
10.1149/05701.1507ecst
复制
发表时间：
2013-10
期刊：
影响因子：
--
通讯作者：
Syed M. Bukhari;William D. Penwell;J. B. Giorgi
中科院分区：
文献类型：
--
作者：
Syed M. Bukhari;William D. Penwell;J. B. Giorgi
固体氧化物燃料电池（SOFC）具有将燃料的化学能转化为电能的能力。该技术提供了一个现实的替代清洁能源，因为它的高效率和低污染（1-4）。然而，由于目前的高温要求导致高制造成本，它们的商业应用受到限制。固体氧化物燃料电池的一大优点是，它们可以与各种燃料一起工作，因为电解质可以传输氧离子。燃料多功能性的核心是阳极材料的反应性和稳定性。因此，理想的阳极必须在低温下有效地操作，并且能够抵抗高度还原的环境以及在烃燃料下的焦炭和硫的中毒。钙钛矿型氧化物（ABO 3）为解决SOFC的这些当前问题打开了一扇新的大门（5，6）ABO 3钙钛矿材料的一大优点是，通过在A-和B-位点引入取代，它们的性质可以根据所需的应用容易地定制（7）。此外，晶格氧在碳清洁机制中起重要作用，其中氧根据需要被输送到适当的位置，利用钙钛矿材料的混合离子电子传导性性质（8，9）。钐铁氧体（SmFeO 3）最初被报道为有效的氧导体和氧化气体的传感器（10，11），但它们也是在还原气氛中不稳定的p型导体。通过在SmFeO 3中的A位添加Ce作为掺杂剂，我们不仅能够解决还原条件下的还原不稳定性问题，而且还能够通过从p型导电性向n型导电性的转变来改善还原条件下钙钛矿的导电性
Solid oxide fuel cells (SOFCs) have the ability to convert chemical energy of fuels into electrical energy. The technology provides a realistic alternative toward clean energy because of its high efficiency and low pollution (1-4). However, their commercial applicability has been limited due to the current high temperature requirements which result in high fabrication costs. One of the great advantages of SOFCs is that they may operate with a wide range of fuels because the electrolyte transports oxygen ions. At the heart of fuel versatility is the reactivity and stability of the anode material. The ideal anode must therefore operate efficiently at low temperatures and be resistant to the highly reducing environment and poisoning from coke and sulphur under hydrocarbon fuels. Perovskite type oxides (ABO3) have opened a new door to solve these current issues of SOFCs (5, 6).One of the great advantages of ABO3 perovskite materials is that their properties can be easily tailored according to the desired applications, by introducing substitutions at A-and B-sites (7). Additionally, lattice oxygen plays an important role in carbon cleaning mechanisms, where the oxygen is transported to the appropriate sites as required, taking advantage of the mixed ion electron conductivity nature of the perovskite material (8, 9). Samarium ferrites (SmFeO3) were originally reported as efficient oxygen conductors and sensors for oxidizing gases (10, 11), but they are also p-type conductors unstable in reducing atmospheres. By adding Ce as a doping agent at the A-site in SmFeO3 we have been able to not only solve the reduction instability issue under reducing conditions, but also improve the electrical conductivity of the perovskite under reducing conditions by a transformation from p-type conductivity to n-type conductivity