阴离子膜燃料电池阴极Co3O4/C催化剂的制备及ORR性能

为降低阴离子膜燃料电池阴极氧还原反应（oxygen reduction reaction, ORR）催化剂的成本，通过简单的超声方法制备碳担载纳米Co3O4（Co3O4/C）催化剂，通过XRD、SEM手段对其结构、形貌进行表征，并评价其催化氧还原性能.结果表明，Co3O4/C催化剂在碱性溶液中表现出良好的ORR催化活性：随着Co3O4含量增加，催化活性先增加后减小；Co3O4含量达50%时，催化性能达到最佳，此时，氧还原反应的极化电流密度为2.93 mA·cm-2（@-0.8 V），氧还原反应的电子转移数为2.51.与传统的Co3O4/C相比，本实验采用超声法制备的Co3O4/C催化剂合成方法简单、成本低，且有较高的氧还原活性，因此，在阴离子膜燃料电池阴极催化剂中有良好的应用前景.
In order to reduce the cost of oxygen reduction reaction (ORR) in Anion membrane fuel cell, carbon supported Co3O4/C was synthesized as ORR catalyst by ultrasonic method. The structure and morphology of Co3O4/C catalyst were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The catalytic activity of the Co3O4/C catalysts for ORR was evaluated. Results show that catalyst exhibites better activity for ORR in alkaline solution. With Co3O4 content increasing in Co3O4/C, the catalytic activity increases first and then decreases. Thus there is an optimal content of Co3O4 , which is 50%. At this point, the polarized current density is 2.93 mA·cm-2(@-0.8V), the electron transfer number of oxygen reduction reaction is 2.51. Compared with the traditional method of preparation of Co3O4/C catalyst, the ultrasonic method used in this experiment is simple, with the lower cost and a higher activity of oxygen reduction. Therefore, this work can provide a facile method to obtain a Co3O4/C catalyst and it will have good prospect of application in anion membrane fuel cell cathode catalysts.