论文部分内容阅读
以氧化石墨烯(GO)为碳载体,g-C3N4作为N源,Co(NO3)2·6H2O作为Co源,经热处理后构建了新型Co/N/C结构的氧气还原催化剂。在热处理过程中,氧化石墨烯上的官能团分解脱离形成活性中心,与结构相似的gC3N4相互作用并通过配位作用实现了Co元素和N元素的同时掺杂。使用傅立叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)对其进行结构表征证实了N元素和Co元素的成功掺杂。在催化剂中N元素主要是以腈氮、石墨式氮、吡啶式氮的形式存在,Co元素则与其中的吡啶式氮配位形成Co-Nx结构。采用循环伏安法(CV)和旋转圆盘电极(RDE)技术,研究其在碱性介质中对氧气还原反应(ORR)的电催化性能。实验结果显示,该新型Co/N/C催化剂具有良好的ORR电催化活性,在碱性溶液中的起始电位为-0.06V,同时有着良好的稳定性和抗甲醇性能。
A novel Co / N / C oxygen reduction catalyst was prepared by using GO as carbon carrier, g-C3N4 as N source and Co (NO3) 2 · 6H2O as Co source after heat treatment. During the heat treatment, the functional groups on the graphene oxide are decomposed and dissociated to form an active center, which interacts with the gC3N4 with the similar structure and achieves the simultaneous doping of the Co element and the N element through coordination. Structural characterization using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed the successful doping of N and Co elements. In the catalyst, N element mainly exists in the form of nitrile nitrogen, graphite nitrogen and pyridine nitrogen, and Co element coordinates with pyridine nitrogen to form Co-Nx structure. Cyclic voltammetry (CV) and spin disk electrode (RDE) techniques were used to investigate the electrocatalytic performance of oxygen reduction reaction (ORR) in alkaline medium. The experimental results show that the new Co / N / C catalyst has good ORR electrocatalytic activity and has an initial potential of -0.06 V in alkaline solution with good stability and methanol resistance.