以氧化石墨烯分散液为前驱体、尿素为主要氮源,经水热还原和真空抽滤后制得不同氧还原催化活性的氮掺杂石墨烯水凝胶薄膜。采用扫描电子显微镜、 X射线光电子能谱仪、激光拉曼光谱仪、循环伏安等手段对材料的形貌、结构和氧还原电催化性能进行表征。结果显示：制得的氮掺杂石墨烯水凝胶薄膜的含氮量在2.37~4.22%之间,其中氮元素主要以吡啶型和吡咯型形式存在。当氮含量为4.22%时,氮掺杂石墨烯水凝胶薄膜具有最小的氧还原起始电位,约为0.15 V,以及最大的极限电流密度,达2.75 mA/cm2,显示出较好的氧还原催化性能。
Nitrogen-doped graphene ( NG) hydrogel film was prepared by hydrothermal reduction and then vacuum filtration methods using graphene oxide dispersion as precursor and urea as the main doping agent. The nitrogen-doped graphene with various oxygen reduction reaction activities can be obtained through tuning the urea addition. The morphologies, structures and electrocatalytic activities of the as-prepared materials were investigated using scanning electron microscope, X-ray photoelectron spectroscopy, laser raman spectrometer and cyclic voltammetry methods. The results showed that the nitrogen-doped graphene hydrogel films have nitrogen contents varying from 2. 37% to 4. 22%, dominant with pyridinic N and pyrrolic N. The electrochemical tests showed, the ORR onset potential reaches the minimum of 0. 15 V when the nitrogen content is 4. 22%, with the limiting current density of about 2. 75 mA/cm2 , which shows good ORR catalytic performance.
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