Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1.
J Am Chem Soc. 2010 Dec 8;132(48):17056-8. doi: 10.1021/ja106217u. Epub 2010 Nov 12.
In the present work, we have designed and synthesized a new highly durable iron phtalocyanine based nonprecious oxygen reduction reaction (ORR) catalyst (Fe-SPc) for polymer electrolyte membrane fuel cells (PEMFCs). The Fe-SPc, with a novel structure inspired by that of naturally occurring oxygen activation catalysts, is prepared by a nonpyrolyzing method, allowing adequate control of the atomic structure and surface properties of the material. Significantly improved ORR stability of the Fe-SPc is observed compared with the commercial Fe-Pc catalysts. The Fe-SPc has similar activity to that of the commercial Fe-Pc initially, while the Fe-SPc displays 4.6 times higher current density than that of the commercial Fe-Pc after 10 sweep potential cycles, and a current density that is 7.4 times higher after 100 cycles. This has been attributed to the incorporation of electron-donating functional groups, along with a high degree of steric hindrance maintaining active site isolation. Nonprecious Fe-SPc is promising as a potential alternative ORR electrocatalyst for PEMFCs.
在本工作中，我们设计并合成了一种新型的基于铁酞菁的高耐久性非贵金属氧还原反应（ORR）催化剂（Fe-SPc），用于聚合物电解质膜燃料电池（PEMFCs）。受天然氧激活催化剂结构启发，通过非热解方法制备了具有新颖结构的 Fe-SPc，从而能够充分控制材料的原子结构和表面特性。与商业 Fe-Pc 催化剂相比，观察到 Fe-SPc 的 ORR 稳定性显著提高。Fe-SPc 的初始活性与商业 Fe-Pc 相当，而在 10 次扫速循环后，Fe-SPc 的电流密度比商业 Fe-Pc 高 4.6 倍，在 100 次循环后，电流密度高 7.4 倍。这归因于引入了供电子的功能基团，以及高度的空间位阻，保持了活性位的隔离。非贵金属 Fe-SPc 有望成为 PEMFCs 中潜在的替代 ORR 电催化剂。
