一体可再生燃料电池双功能催化剂的制备方法

Preparation Methods of Bifunctional Catalyst for Unitized Regenerative Fuel Cell

目的本文旨在探讨可再生燃料电池双功能催化剂的最优制备工艺。方法采用浸渍还原法、烧结法、共沉积法分别制备载量为20%的Pt/IrO2,对3种方法制备的催化剂进行XRD表征,并且观测其作为URFC氧极催化剂时电池的性能。结果从操作方法来看,烧结法更为优越;从XRD测试看,浸渍还原法所制得催化剂的Pt-Ir干涉峰更为强烈;从电池极化曲线上来看,浸渍还原法也占有优势。结论浸渍还原法所制得的催化剂性能更为优越,然而受实验中还原剂浓度,pH值等因素影响较大;共沉积法在离心过程中催化剂损耗较大;烧结法易于放大及批量生产,然而催化剂性能一般。

Objective To find the optimal preparation method for oxygen electrode catalyst of the proton ex- change membrranee（PEM） unitized regenerative fuel cell （URFC）. Methods Pt/IrO2 （20%） was prepared with 3 different methods including agglomerate method, dipping-deoxidation method and deposit method. The developed catalyst were characterized by XRD and the performance of cell using regenerative fuel were deter- mined. Results In the aspect ofoperation, the agglomerate method was preferable. While in the aspect of XRD and polarization curve, the catalyst prepared with the dipping-deoxidation method was outstanding. Conclusion The performance of catalyst prepared with the dipping-deoxidation method is excellent but is affected signifi- cantly by the concentration of the reducing agent and the pH value. The method of deposit can cause greater catalyst lose during the centrifugal process. The operation of agglomerate is simple, but the performance of the catalyst prepared is not satisfactory.