直接甲醇燃料电池含氧空穴CaTiO_(3)阴极助催化剂研究

Study on oxygen-containing hole CaTiO_(3)cathode cocatalyst for direct methanol fuel cells

作为便携移动电源,直接甲醇燃料电池(DMFC)在高海拔、低氧浓度条件下的性能变化直接影响其实际应用效果。针对低氧浓度条件下,DMFC阴极极化损失增大问题,通过水热模板法合成CaTiO_(3)助催化剂,与商品Pt/C催化剂进行不同比例掺杂,对掺杂催化剂进行了X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)和透射电子显微镜法(TEM)等表征分析以及旋转圆盘电极(RDE)、单电池电化学测试。与商品Pt/C催化剂相比,掺杂(CaTiO_(3)与Pt/C的质量比为1∶1)催化剂的半波电位正移39 mV;当氧浓度从100%逐渐降低到10%,Pt/C膜电极峰值功率密度降低了38.62%,Pt/CCTO膜电极峰值功率密度降低15.03%。在10%低氧浓度下,Pt/C-CTO膜电极峰值功率密度较Pt/C膜电极峰值功率密度高40.54%。

As a portable mobile power source,the performance of direct methanol fuel cells(DMFC)under high altitude and low oxygen concentration conditions directly affects its practical application.In order to solve the problem of increasing cathode polarization loss of DMFC under low oxygen concentration conditions,CaTiO_(3)cocatalyst was synthesized by hydrothermal template method and doped with commercial Pt/C catalyst in different proportions.The doped catalyst was characterized by XRD,SEM and TEM,and RDE and single cell electrochemical tests were conducted.Compared with the commercial Pt/C catalyst,the half-wave potential of the doped(the ratio of CaTiO_(3)and Pt/C is 1∶1)catalyst shifts 39 mV.When the oxygen concentration gradually decreases from 100%to 10%,the peak power density of Pt/C membrane electrode decreases by 38.62%,and the peak power density of Pt/C-CTO membrane electrode decreases by 15.03%.At low oxygen concentration of 10%,the peak power density of Pt/C-CTO membrane electrode is 40.54%higher than that of Pt/C membrane electrode.