氧还原催化剂Fe-N/C的制备及催化性能

Preparation and performance of oxygen reduction reaction catalyst Fe-N/C

将乙炔黑、六次甲基四胺和六水三氯化铁混合研磨,经800℃热处理制备出氧阴极还原催化剂Fe-N/C。采用X射线衍射对催化剂结构进行表征,用电化学线性扫描法对其催化活性和稳定性进行了评价。实验考察了热处理温度和热处理时间对催化剂性能的影响。结果表明该催化剂制备的最佳催化条件为:热处理温度800℃下保温2 h。铁单质的存在和热处理温度对Fe-N/C催化剂的催化活性和稳定性影响较大,单质铁有助于催化活性位的形成。

Acetylene black,hexamethylene tetramine(HMTA) and ferric chloride were mixed and ground together,and then Fe-N/C catalyst for oxygen reduction reaction(ORR) was prepared by heat-treating the mixture at a high temperature of 800 ℃.The structure of the catalyst was characterized by X-ray diffraction method.The electrocatalytic performance to ORR was evaluated by linear sweep voltammetry.The effect of heat treatment temperature and retention time on the catalytic activity was both investigated in the work.The result shows that the best preparation condition is under heat treatment temperature of 800 ℃ for retention time of 2 h.The elemental iron and the heat treatment temperature have a great influence on catalytic activity of Fe-N/C catalyst,and the elemental iron helps the formation of the catalytic active site.