知识与财富的链接
氮掺杂碳材料是一种有应用前景的电催化氧还原催化剂。以尿素和三聚氰胺作为氮源,在氮气气氛下高温焙烧,制得两种氮掺杂科琴黑碳材料并将其用于电催化氧还原反应。使用X射线衍射仪（XRD）、X射线光电子能谱仪（XPS）、场发射扫描电子显微镜（FESEM）、比表面物理吸附分析仪等对氮掺杂前后的科琴黑的结构和形貌进行了分析。结果表明：氮掺杂之后科琴黑仍保持石墨结构,其形貌和比表面积均无明显改变。在XPS谱图上,氮掺杂后科琴黑上存在氮元素,其中以三聚氰胺为氮源比以尿素为氮源更容易得到吡啶氮。通过循环伏安法和线性扫描伏安法研究了3个样品的电催化氧还原性能。结果表明：氮掺杂能明显提高科琴黑的电催化氧还原性能,未掺杂的 科琴黑（AC）的半波电位为0.746 V,而以尿素和三聚氰胺为氮源掺杂后的科琴黑碳材料的半波电位分别提高到了 0.756 V（尿素-N/AC）和0.786 V（三聚氰胺-N/AC）。
N-doped carbon material is a kind of promising oxygen reduction reaction（ORR） electrocatalyst.Two kinds of N-doped Ketjenblacks carbon were prepared using urea and melamine as nitrogen sources by a high temperature calcination method under nitrogen atmosphere.The structure and morphology of the Ketjenblacks carbon materials being doped by N before and after were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,field emission scan ning electron microscope（FESEM） and specific surface area analysis techniques.Results showed that the N-doped Ketjen black maintained graphite structure,the morphology and BET surface area were not changed significantly.The XPS charac terization illustrated that nitrogen was introduce to the N-doped Ketjenblack carbon.Using melamine as nitrogen source could introduce more pyridinic N than that of using urea.Cyclic voltammetry and linear sweep voltammetry were used to investigate the electrocatalytic oxygen reduction performance of three samples.The results showed that doping nitrogen on Ketjenblack carbon could enhance the electrocatalytic oxygen reduction performance effectively.For the pristine Kenjenblack carbon,the halfwave potential were 0.746 V.After using urea and melamine as nitrogen sources,the halfwave potential for urea-N/AC and melamine-N/AC were enhanced to 0.756 V and 0.786 V,respectively.
