【摘要】：過渡金屬氮摻雜碳基催化劑已成為替代鉑基氧還原反應(yīng)(ORR)電催化劑的理想選擇。本文通過靜電紡絲技術(shù)制備了高比表面、高度分散的鈷原子配位氮摻雜的碳納米纖維催化劑(Co-N/C)。X射線衍射(XRD)和高分辨率透射電鏡(HRTEM)結(jié)果證實(shí)Co元素高度分散于制備的Co-N/C催化劑中。X射線光電子能譜結(jié)果表明N元素主要以吡啶N和石墨N形式存在。該Co-N/C催化劑對ORR反應(yīng)呈現(xiàn)出較高的電催化活性,其氧還原起始和半波電位分別為0.92 V和0.80 V(相對于標(biāo)準(zhǔn)氫電極),接近于商業(yè)化Pt/C催化劑的性能。以制備的Co-N/C催化劑作為陰極,25℃下鋅空氣燃料電池的開路電位1.54 V、最大功率密度達(dá)到了190 m V·cm~(-2)表明該催化劑具有良好的應(yīng)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，

本文編號：2493546