PtFe/nitrogen-doped graphene for high-performance electrooxidation of formic acid with composition sensitive electrocatalytic activity
PtFe/nitrogen-doped graphene for high-performance electrooxidation of formic acid with composition sensitive electrocatalytic activity
复制标题
DOI：
10.1039/c5ra05769h
复制
发表时间：
2015-07
期刊：
影响因子：
3.9
通讯作者：
Yanfang Sun;Ting Zhou;Qingyan Pan;Xiao Zhang;Jinxue Guo
中科院分区：
文献类型：
--
作者：
Yanfang Sun;Ting Zhou;Qingyan Pan;Xiao Zhang;Jinxue Guo
为了寻求用于燃料电池的新型高性能电催化剂，开发了一种简单的合成策略，该策略包括水热反应和氢气固态还原，以制备一系列具有可控Pt：Fe组成的PtxFe100−x/N掺杂石墨烯纳米复合材料。利用透射电子显微镜、扫描电子显微镜、能谱、粉末X射线衍射、X射线光电子能谱和拉曼光谱系统地表征了样品的形貌、微观结构和成分。通过使用本样品作为甲酸电氧化催化剂，很好地揭示了氮掺杂和铁合金化的影响以及它们的协同相互作用对催化性能提高的影响。此外，还探讨了这些甲酸电氧化催化剂的组成敏感催化活性和稳定性，并提出了最佳 Pt: Fe 比例。最佳样品具有增强的电化学性能和减少的贵金属用量，使其成为燃料电池应用的有希望的候选者。
With the aim to pursue novel high-performance electrocatalysts for fuel cells, a simple synthesis strategy, which consists of hydrothermal reaction followed by solid state reduction by H2, is developed to prepare a series of PtxFe100−x/N-doped graphene nanocomposites with controllable Pt : Fe compositions. The morphology, microstructure, and composition of the samples are systematically characterized with transmission electron microscopy, scanning electron microscopy, energy dispersive spectroscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. The effects of nitrogen doping and alloying with Fe, as well as their synergistic interactions, on the improvement of the catalytic performance are well revealed by using the present samples as catalysts for formic acid electrooxidation. Additionally, the composition sensitive catalytic activity and stability of these catalysts for formic acid electrooxidation are probed and the optimum Pt : Fe ratio is presented. The optimum sample possesses both enhanced electrochemical performance and a reduced dosage of the noble metal, making it a promising candidate for fuel cell applications.