%0 Journal Article
%T <br>
%A 严六明
%A 周扬
%A 杨辉
%A 程庆庆
%A 邹志青
%A 黄庆红
%J 物理化学学报
%D 2017
%R 10.3866/PKU.WHXB201704131
%X 过渡金属氮掺杂碳基催化剂已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备了高比表面、高度分散的钴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元素主要以吡啶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0.92 V和0.80 V（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1.54 V、最大功率密度达到了190 mV·cm-2表明该催化剂具有良好的应用前景。<br>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 1s 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
%U http://www.whxb.pku.edu.cn/CN/Y2017/V33/I7/1429