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廉价、储量丰富的非贵金属材料作为高效氧还原电催化剂是未来能量存储系统实际应用的关键.基于此,我们通过静电纺丝法并结合相应热处理制备了一维氮掺杂碳纳米纤维包覆一氧化锰(MnO-NCNFs).该材料在碱性体系中表现出良好的电化学性能,耐甲醇腐蚀性和稳定性.其优异的电催化活性主要归结于以下几点:(1)均一的一维纤维结构和导电网络能够促进反应过程中快速的电子转移;(2)过渡金属锰的引入能够促进无定型碳向石墨碳的转变,同时石墨化程度的提高意味着更好的导电性,有利于氧还原活性的提高;(3)多孔结构和高比表面积能够有效降低传质阻力并提高暴露的氧还原活性位点数量,进而提高物质利用效率.
Cheap and abundant non-precious metal materials as efficient oxygen reduction electrocatalysts are the key to the practical application of energy storage system in the future.Based on this, we prepared one-dimensional nitrogen-doped carbon nanofibers coated by electrospinning combined with the corresponding heat treatment Manganese oxide (MnO-NCNFs). This material shows good electrochemical performance, resistance to methanol corrosion and stability in alkaline system. Its excellent electrocatalytic activity is mainly due to the following points: (1) Dimensional fiber structure and conductive network can promote rapid electron transfer during the reaction; (2) the introduction of transition metal manganese can promote the amorphous carbon to graphite carbon conversion, while the degree of graphitization means better conductivity, with Which is conducive to the improvement of oxygen reduction activity; (3) The porous structure and high specific surface area can effectively reduce the mass transfer resistance and increase the number of exposed oxygen reduction active sites, thereby improving material utilization efficiency.