Pt/C改性的质子交换膜在燃料电池中的应用

氢氧燃料电池的性能与质子交换膜的性能密切相关. 在燃料电池运行过程中，反应生成的水和加湿气体所含水的扩散渗透与膜内质子拖拽共同作用实现膜中水的平衡，影响膜的欧姆电阻，进而影响电池性能. 本文通过掺杂Pt/C对质子膜进行改性，并测试了改性膜的交流阻抗、吸水特性等物理性质和单电池性能及高频阻抗，说明由膜中的Pt/C催化剂原位催化渗透到膜中的氢气和氧气反应生成水，改善了电池低湿度运行时膜的含水率，从而降低膜电阻，提升电池性能.

Pt/C Modified Proton Exchange Membrane for Improved Fuel Cell Performance

The property of proton exchange membrane greatly affects the performance of proton exchange membrane fuel cells (PEMFC). During the operation of a PEMFC, the water produced at the cathode, the water vapor from the humidified feed gas and the water migrated by electro-dragging will reach a balance in the membrane and determine the resistance of PEMFC, and thus affect the performance of PEMFC. Normally, the PEMFC performance strongly depends on the relative humidity of the feed gas, and the performance decreases at lower humidity as a result of lower proton conductivity of the membrane. In this paper, we proposed to employ a Pt/C modified proton exchange membrane by promoting the H₂ and O₂ (that diffuse into the membrane from the feed gases) reactions in the membrane to produce water locally, and consequently improving the water content in the membrane. The AC resistance and water sorption property of the membrane, the performance and high frequency resistance of the cell prepared with home-made membrane were investigated in detail. It is found that the Ohmic resistance of the membrane was decreased under the same operation conditions and the PEMFC performance was greatly improved.