Activity and degradation study of an Fe-N-C catalyst for ORR in Direct Methanol Fuel Cell (DMFC)
Activity and degradation study of an Fe-N-C catalyst for ORR in Direct Methanol Fuel Cell (DMFC)
复制标题
DOI：
10.1016/j.apcatb.2019.118217
复制
发表时间：
2020-03-01
影响因子：
22.1
通讯作者：
Kramm, Ulrike I.
中科院分区：
文献类型：
--
作者：
Martinaiou, Ioanna;Videla, Alessandro H. A. Monteverde;Kramm, Ulrike I.
本文报道了一种非贵金属Fe-N- C型催化剂在酸性介质中的活性和稳定性。以聚苯胺、双氰胺和醋酸铁为前驱体制备了催化剂。采用变温圆盘电极法测定了催化剂的活化能。此外，负载循环耐久性测试表明，甲醇的加入并没有引起催化剂的失活。在直接甲醇燃料电池（DMFCs）中，与其它Fe-N-C催化剂相比，我们的催化剂表现出类似的良好性能。拉曼和穆斯堡尔光谱提供了有关催化剂耐久性和稳定性测试引起的结构组成和化学变化的有价值的信息。虽然DMFC运行期间的最大功率密度下降了85%，铁位点的定性分布可能表明铁和氧化铁簇的形成作为与FeN 4位点的分解相关的分解产物。
In this work a comprehensive study of the activity and stability of a non-precious metal catalyst of type Fe- N- C in acidic media is reported. The catalyst was prepared from polyaniline, dicyandiamide and iron acetate as precursors. Temperature-dependent rotating-disk electrode experiments were performed to determine the activation energy of the catalyst. Besides, load cycle durability tests with and without the addition of methanol show that there is no additional deactivation caused by methanol addition.In a Direct Methanol Fuel Cell (DMFCs) our catalyst performed similarly good in comparison to other Fe-N-C catalysts. Raman and Mossbauer spectroscopy provide valuable information on the structural composition and chemical changes induced by durability and stability testing of the catalyst. While the maximum power density during DMFC operation decreases by 85%, the qualitative distribution of iron sites might indicate the formation of iron and iron oxide clusters as decomposition product associated with the disintegration of FeN4 sites.