【摘要】 燃料电池中阴极需要使用高活性的电催化剂来加速氧气还原反应(ORR)过程,目前最有效的催化剂都是地球储量稀缺且价格昂贵的贵金属催化剂,严重阻碍了燃料电池的大规模应用。因此,开发催化活性较高但价格低廉的新型催化剂是实现燃料电池大规模应用的必经之路。研究发现,过渡金属和杂原子修饰的碳材料因其较低的成本和较高的催化活性具有很大的应用潜力。采用水热和高温煅烧的方法,制备富含氮的铁掺杂多级孔碳材料。并通过SEM、TEM、XRD、XPS和Raman等手段对材料进行结构表征,利用CV、LSV和I-T等手段评价其电化学性能。结果表明制备出的富含氮的铁掺杂多级孔碳材料具有较高的比表面积和孔隙率,同时在碱性和酸性介质中均表现出了优异的ORR催化性能。更多还原

【Abstract】 The highly active catalyst is imperative to boost the cathodic reaction of oxygen reduction reaction(ORR)in full cells. Currently,the Pt is the benchmark catalyst for ORR,whereas its scarcity and high cost have greatly limited its widespread application. Accordingly,numerous efforts have been devoted to developing efficient earth-abundant materials to replace Pt based materials,such as(M-Nx/C). Herein,Fe,N co-doped hierarchically porous carbon materials were prepared by a hydrothermal synthesis and calcinating method. SEM,TEM,XRD,XPS and Raman technology were employed to characterize the morphology, composition and structure. CV, LSV and I-T were used to evaluate the electrocatalytic performance of the materials. The results suggest that the prepared materials possess a lot of virtues,such as high BET surface area,well-defined channel and highly effective active sites involved graphitic N and Fe5 C2. Accordingly,the catalyst displays good performance in both alkaline and acid media for oxygen reduction reaction.更多还原