直接甲醇燃料电池的Ir-Fe/C阴极催化剂性能

Electrocatalytic Performance of Cathodic Ir-Fe/C Catalyst in Direct Methanol Fuel Cell

合成了直接甲醇燃料电池的Ir-Fe/C阴极催化剂,用X射线衍射(XRD)谱和X射线能量色散谱(EDS)等方法对该催化剂进行表征,研究了碳载Ir-Fe(Ir-Fe/C)催化剂对氧还原的电催化活性和抗甲醇能力.研究发现,氧在碳载Ir(Ir/C)和Ir-Fe/C催化剂电极上还原的起始氧还原电位分别为0.57和0.65 V.在0.2 V下的电流密度分别为4.6和5.8 mA/cm2,表明Ir-Fe/C催化剂对氧还原的电催化性能要优于Ir/C催化剂,而且Ir-Fe/C催化剂也有很好的抗甲醇能力.

Ir-Fe/C catalyst was prepared. The electrocatalytic activity of the Ir-Fe/C catalyst for the oxygen reduction and its methanol tolerance ability were investigated,based on the characterization with X-ray diffractometer（XRD） and energy dispersive spectrometer（EDS）. The results show that the onset potentials of the oxygen reduction at the Ir/C and Ir-Fe/C catalyst electrodes are 0.57 and 0.65 V,respectively,and the current densities at 0.2 V are 4.6 and 5.8 mA/cm2,respectively.It indicates that the electrocatalytic activity of the Ir-Fe/C catalyst for the oxygen reduction is better than that of the Ir/C catalyst.In addition,the Ir-Fe/C catalyst possesses the high methanol tolerance ability.These results lay a strong basis for the use of the Ir-Fe/C cathodic catalyst in direct methanol fuel cell（DMFC）.