(中南大学 化学化工学院，长沙 410083)
摘 要: 以乙酸钴(锌)、苯并咪唑为原料，采用液相法快速地合成金属沸石咪唑酯骨架(M-ZIFs)材料，通过高温裂解，得到含氮碳材料M-Nx/C，并对其氧还原性能进行研究。通过X射线衍射(XRD)，扫描电镜(SEM)，透射电镜(TEM)，X射线光电子能谱分析(XPS)和电化学测试等手段对合成催化剂的形貌、成分和电催化性能进行了表征。通过比较发现，具有较高的石墨化程度和Co-Nx活性位点的Co-Nx/C材料的催化氧还原性能远高于Zn-Nx/C的，具有较正的氧还原起始电位(0.92 V)和半波电位(0.83 V)，接近铂碳的指标；而在稳定性方面，该材料在反应10000s后仍能保持94.2%的电流密度，远高于铂碳的80.8%。
关键字: 含氮碳材料；氧还原；活性位点；电催化
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:M-Nx/C was obtained by pyrolyzing the M-ZIFs through quick liquid phase reaction of cobalt (zinc) acetate and organic ligand (Benzimidazole). Then the morphology, composition and electrocatalytic activity were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and electrochemical measurements. Compared with Zn-Nx/C, Co-Nx/C has higher eletrocatalytic activity for possessing high graphitization and CoNx active sites for oxygen reduction reaction (ORR). The onset potential and half wave potential of oxygen reduction on Co-Nx/C electrode are 0.92 V and 0.83 V, respectively, which are close to those of Pt/C. As for the stability, the Co-N/C maintains 94.2% current density after 10000 s, while the Pt/C maintains 80.8%.
Key words: N-containing carbon material; oxygen reduction; active site; eletrocatalysis
