高分散钴氮共掺杂碳纳米纤维氧还原催化剂
发布时间：2019-06-05 12:59
【摘要】：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 m V·cm~(-2)表明该催化剂具有良好的应用前景。
[Abstract]:Transition metal nitrogen-doped carbon-based catalyst has become an ideal alternative to (ORR) electrocatalyst for platinum-based oxygen reduction reaction. In this paper, the high specific surface area was prepared by electrospinning technology. Highly dispersed carbon nanofiber catalysts (Co-N/C) were highly dispersed by coordination nitrogen of cobalt atoms. X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM) results confirmed that Co elements were highly dispersed in the prepared Co-N/C. The results of X-ray photoelectron spectroscopy show that N mainly exists in the form of pyridine N and graphite N. The Co-N/C catalyst has high electrocatalytic activity for ORR reaction, and its oxygen reduction initiation and half-wave potentials are 0.92V and 0.80V, respectively (compared with the standard hydrogen electrode), which is close to the performance of commercial Pt/C catalyst. Using the prepared Co-N/C catalyst as cathode, the open circuit potential of zinc air fuel cell at 25 鈩，
本文编号：2493546
[Abstract]:Transition metal nitrogen-doped carbon-based catalyst has become an ideal alternative to (ORR) electrocatalyst for platinum-based oxygen reduction reaction. In this paper, the high specific surface area was prepared by electrospinning technology. Highly dispersed carbon nanofiber catalysts (Co-N/C) were highly dispersed by coordination nitrogen of cobalt atoms. X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM) results confirmed that Co elements were highly dispersed in the prepared Co-N/C. The results of X-ray photoelectron spectroscopy show that N mainly exists in the form of pyridine N and graphite N. The Co-N/C catalyst has high electrocatalytic activity for ORR reaction, and its oxygen reduction initiation and half-wave potentials are 0.92V and 0.80V, respectively (compared with the standard hydrogen electrode), which is close to the performance of commercial Pt/C catalyst. Using the prepared Co-N/C catalyst as cathode, the open circuit potential of zinc air fuel cell at 25 鈩，
本文编号：2493546
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