Co-Mo-N/TiN催化剂的制备及其氧还原性能研究

Preparation of Co-Mo-N/TiN catalyst and its ORR performance

以改进的溶胶凝胶法将Co、Mo混合氧化物负载在纳米氮化钛上,经程序升温氨还原得到催化剂CoMo-N/Ti N,并使用XRD、EDS、CV、RDE等方法对催化剂的结构及氧还原性能进行测试.结果显示,热处理温度为650℃时制得的催化剂Co-Mo-N-650的氧还原催化活性最好,其氧还原起始电位为0.372 V(vs.SCE),在转速为2 000 rpm时极化电流密度达2.21 m A·cm-2,并得到了该催化剂上氧还原反应的转移电子数为2.6,说明Co-Mo-N-650催化的氧还原反应主要按二电子路径进行.

In this paper, a modified sol-gel method is used to load cobalt and molybdenum mixed oxides on nano-sized TiN, and then to obtain Co-Mo-N/TiN catalysts by temperature-programmed reduction under ammo- nia atmosphere. The physical properties and oxygen reduction reaction performance of the obtained catalysts are tested by XRD, EDS, CV, RDE measurements. The results show that catalyst Co-Mo-N-650 has the best ORR performance, and its onset potential is located at 0. 372 V while reaching up a polarization current density of 2.21 mA ·cm-2 at a rotating rate of 2 000 rpm. Besides, the number of electrons transferred on Co-Mo-N-650 catalyst is 2.6, indicating that the ORR reaction on it follows a pathway of two electrons.