以硝酸铁为金属离子前驱体、均苯三甲酸为有机配体,采用水热法合成了金属有机骨架MOF(Fe)催化剂,应用X射线衍射、N2吸附-脱附、透射电镜、红外光谱和热重等方法对催化剂的结构进行了表征,并采用循环伏安法测试了催化剂在碱性电解质中的氧气还原(ORR)催化性能,同时也采用旋转圆盘电极进一步研究了催化剂的ORR的动力学行为.结果表明,所制MOF(Fe)具有很好的晶型结构、大比表面积、丰富的微孔以及较高的热稳定性.且表现出很好的ORR催化活性.ORR的反应历程随电位的改变而改变:电位在-0.3到0.50 V范围内,ORR为2电子途径;随着电位从-0.50 V升至-0.95 V,ORR从2电子向4电子途径转变.另外,该催化剂在碱性电解质中也表现出较好的氧气析出(OER)催化性能,这为制备用于ORR和OER的高效非贵金属催化剂提供了新的途径.
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