MgMn_2O_4的制备及其对氧还原反应的电催化性能研究

Preparation and electrochemical performance of MgMn_2O_4 catalyst towards the oxygen reduction

通过水热法,以乙酸锰、乙酸镁为原料制备出纳米MgMn_2O_4作为氧还原电催化剂,利用X射线衍射仪(XRD)和场发射电子扫描仪(FESEM)对催化剂微观结构进行表征,并在碱性溶液中通过循环伏安法和旋转圆盘技术对电催化剂的氧还原活性、稳定性以及抗甲醇中毒性进行研究。结果表明,MgMn_2O_4催化剂具有较高的氧还原活性,极限电流密度与Pt/C催化剂的相接近,稳定性和抗甲醇中毒性超过Pt/C催化剂。

In this paper. The MgMn_2O_4 nanoparticles was synthetized from Mg(CH_3COO)2·4H_2O and Mn(CH_3COO)2·4H_2O by a facile solvothermal process and calcining method. The microstructure of the catalyst was characterized by X-Ray Diffraction measurements and field-emission scanning electron microscopy(FESEM). The electrocatalytic activities for oxygen reduction reaction(ORR), stability and resistance to methanol toxic were investigated by Cyclic Voltammetry(CV) and Rotating Disk Electrode(RDE) in alkaline solution. The results showed that the MgMn_2O_4 had high oxygen reduction activity, the limited current density was close to Pt/C catalyst, the stability and resistance to methanol toxic of the catalyst were outstanding than commercial Pt/C catalyst.