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以氧化石墨烯(GO)为碳载体,K3Fe(CN)6同时作为N源和Fe源,经热处理后构建了新型Fe/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,Fe元素和N元素的同时掺杂是通过氧化石墨烯与K3Fe(CN)6之间的相互作用而实现的.通过傅立叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)表征证明了这种非贵金属催化剂中N元素和Fe元素的成功掺杂,在催化剂中N元素主要是以吡啶式氮、吡咯式氮和石墨式氮的形式存在,Fe(II)和Fe(III)则与其中的吡啶式氮配位形成Fe-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:Fe/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-0.15 V,同时有着良好的稳定性和抗甲醇性能.
With the graphene oxide (GO) as carbon carrier, K3Fe (CN) 6 was also used as the N source and Fe source to form a novel oxygen reduction catalyst with Fe / N / C structure after heat treatment. Functional group dissociates to form an active center, and the simultaneous doping of Fe and N elements is achieved through the interaction between graphene oxide and K3Fe (CN) 6. By Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron energy The results of XPS indicated that N and Fe were successfully doped in this nonmetallic catalyst. In the catalyst, N was mainly existed as pyridine nitrogen, pyrrole nitrogen and graphite nitrogen, while Fe (II) And Fe (III) were coordinated with pyridine nitrogen to form Fe-Nx structure.The cyclic voltammetry (CV) and rotary disk electrode (RDE) were used to study the oxygen reduction reaction in alkaline medium ORR). The experimental results show that the Fe / N / C catalyst has good ORR electrocatalytic activity and has an initial potential of -0.15 V in alkaline solution with good stability and methanol resistance.