以葡萄糖为碳源、硝酸铁为铁源,六次甲基四胺为氮源或沉淀剂,水热法合成铁/碳微球氧还原催化剂前驱体,再在氨气气氛中热处理制备出氧还原催化剂。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱分析仪(XPS)、旋转圆盘电极(RDE)对催化剂进行表征,并探讨了热处理温度对催化剂性能的影响。结果表明:不同温度热处理形成不同的铁氮化合物结构,催化剂中存在4种型态氮的化合物。热处理温度为800℃制得的催化剂氧还原起始电位为0.55V(vs Ag/AgCl),氧还原反应途径为四电子路径。
Used glucose as a carbon source,ferric nitrate as an iron source,and hexamethylenetetramine as a nitrogen source and precipitant,iron/carbon microsphere catalyst precursor of oxygen reduction was synthesis by hydrothermal method,followed by heat treatment in an ammonia gas atmosphere to prepare oxygen reduction catalyst.The effect of heat treatment temperature on the performance of catalyst was discussed.The catalyst was characterized by X-ray diffractomete (XRD),scanning electron microscopy (SEM),X-ray photoelectron spectroscopy(XPS) and rotating disc electrode(RDE).The results showed that the catalyst with four kinds of nitrogen compounds had different structures of iron nitrogen in heat treatment at different temperature.The as-prepared catalyst at the heat treatment temperature 800℃ exhibited the initial potential of 0.55V (vs Ag/AgCl) in oxygen reduction and the path of oxygen reduction reaction was a four-electron mechanism.
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基金资助
广州市属高校羊城学者项目(1201541563)
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