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将掺杂铁离子的聚苯胺(PANI)与碳纳米管(MWCNT)复合物在900℃加热,得到含铁的催化剂FeNC;然后将含钴盐的FeNC在不同温度下焙烧,得到复合催化剂FeCoNC。对催化剂的表观结构、比表面积、热稳定性、组成以及氧还原(ORR)电催化活性进行表征,研究了焙烧温度和氮含量等因素对其催化活性的影响。结果表明:随着焙烧温度的升高,催化剂的表面结构趋于均匀,焙烧温度为500℃的催化剂表面结构最为均匀平整,高于500℃时出现烧结;较高的氮含量能改善催化剂的ORR电活性。焙烧温度为500℃的催化剂对ORR的电催化活性最高,在酸性和碱性溶液中ORR的起始电位分别为0.63和-0.12 V(vs SCE),电流密度分别为11.67和9.83 mAmg-1@-0.3 V(vs SCE),并具有较好的热稳定性和催化活性稳定性。分步加入Fe和Co,并在加Co后在500℃焙烧得到的催化剂对ORR具有优异的电催化活性。
The ferric ion-doped polyaniline (PANI) and the carbon nanotube (MWCNT) composite are heated at 900 ° C. to obtain FeNC containing iron. The FeNC containing cobalt salt is calcined at different temperatures to obtain the composite catalyst FeCoNC. The apparent structure, surface area, thermal stability, composition and ORR electrocatalytic activity of the catalyst were characterized. The effects of calcination temperature and nitrogen content on the catalytic activity were investigated. The results show that the surface structure of the catalyst tends to be uniform with the increase of calcination temperature. The surface structure of the catalyst with the calcination temperature of 500 ℃ is the most uniform and the sintering temperature is higher than 500 ℃. Higher nitrogen content can improve the ORR Electric activity. The ORR catalyst exhibited the highest electrocatalytic activity at 500 ℃ with an initial potential of 0.63 and -0.12 V (vs. SCE) in acidic and alkaline solutions, respectively, with current densities of 11.67 and 9.83 mAmg -1, respectively -0.3 V (vs SCE), and has good thermal stability and catalytic stability. The catalyst obtained by the stepwise addition of Fe and Co and calcined at 500 ° C after addition of Co has excellent electrocatalytic activity on ORR.