State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology, Beijing 100029, PR China.
State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology, Beijing 100029, PR China.
J Colloid Interface Sci. 2020 Feb 15;560:330-337. doi: 10.1016/j.jcis.2019.09.101. Epub 2019 Oct 9.
In this work, oxygen reduction reaction (ORR) electrocatalysts Fe/Ni bimetal and nitrogen co-doped porous carbon fibers (Fe/Ni-NPCF), derived from electrospun nanofiber, have been prepared. In order to optimize the ORR performance of one dimension (1D) catalysts, SiO were used as template to create the hierarchical porous structure. The morphology of Fe/Ni-NPCF was investigated by scanning electron microscope (SEM) and transmission electron microscope (TEM). By adjusting the ratio of iron and nickel, the influence of the trace of secondary-metal doping in electrocatalyst on catalytic activity was deeply studied. The electrochemical measurements suggested that the trace of secondary-metal doping was good for increasing the half-wave potential of electrocatalyst. The optimized Fe/Ni-NPCF exhibited an excellent catalytic activity with an onset potential of 0.96 V and a half-wave potential of 0.88 V, which are comparable to that of the benchmark 20 wt% Pt/C. This excellent catalytic performance was derived from secondary-metal doping and abundant pore structure.
在这项工作中，我们制备了氧还原反应（ORR）电催化剂 Fe/Ni 双金属和氮共掺杂多孔碳纤维（Fe/Ni-NPCF），其来源于静电纺丝纳米纤维。为了优化一维（1D）催化剂的 ORR 性能，我们使用 SiO2 作为模板来构建分级多孔结构。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了 Fe/Ni-NPCF 的形态。通过调整铁和镍的比例，深入研究了电催化剂中痕量二次金属掺杂对催化活性的影响。电化学测量表明，痕量二次金属掺杂有利于提高电催化剂的半波电位。优化后的 Fe/Ni-NPCF 表现出优异的催化活性，起始电位为 0.96 V，半波电位为 0.88 V，可与基准 20 wt% Pt/C 相媲美。这种优异的催化性能源自于二次金属掺杂和丰富的孔结构。
