中文摘要：

过渡金属氮掺杂碳基催化剂己成为替代铂基氧还原反应（ORR）电催化剂的理想选择。本文通过静电纺丝技术制各了高比表面、高度分散的钻原子配位氮掺杂的碳纳米纤维催化剂（Co．N／C）。X射线衍射（XRD）和高分辨率透射电镜（HRTEM）结果证实Co元素高度分散于制备的Co．N／C催化剂中。X射线光电子能谱结果表明N元素主以吡啶N和石墨N形式存在。该Co．N／C催化剂对ORR反应呈现出较高的电催化活性，其氧还原起始和半波电位分别为0．92V和0．80V（相对于标准氢电极），接近于商业化Pt／C催化剂的性能。以制备的Co—N／C催化剂作为阴极，25℃下锌空气燃料电池的开路电位1．54V、最大功率密度达到了190mV-cm-2表明该催化剂具有良好的应用前景。

英文摘要：

Transition metal-nitrogen doped carbon-based catalysts have become promising alternatives to precious metal catalysts for the oxygen reduction reaction （ORR）. Here, we report a nitrogen-doped carbon nanofiber electrocatalyst coordinated with highly dispersed cobalt atoms （Co-N/C） with a high specific surface area prepared by an electrospinning method. X-ray diffraction （XRD） and high-resolution transmission electron microscopy （HR-TEM） results confirmed that Co was highly dispersed within the prepared Co-N/C catalyst. X-ray photoelectron spectroscopy for N ls spectra showed that the N species mainly existed in the forms of pyridinic N and graphitic N. This Co-N/C catalyst exhibited considerable ORR performance with onset and half-wave potentials at 0.92 and 0.80 V （relative to the reversible hydrogen electrode （RHE））, which are comparable to those of commercial Pt/C. With the prepared Co-N/C catalyst as the cathode, a Zn-air battery displayed an open-circuit potential of 1.54 V and a peak power density of 190 mW-cm-2 at 25 ℃, which suggest a promising application.