【摘要】 质子交换膜燃料电池(PEMFC)广泛采用重整气为燃料,其存在的主要问题是重整气中含有一定浓度的CO(5×10-5～10-2),CO在Pt表面具有强烈的吸附作用,使电催化剂“中毒”。通过对提高质子交换膜燃料电池抗CO问题进行研究,在阳极扩散层流场侧担载催化剂(Pt、PtRu)的方法对电极进行修饰,在注入较少量氧化剂(体积百分比为2%的空气)的条件下使电池抗CO性能显著增强,且可以避免电极局部温度过高及可能带来的安全性问题。更多还原

【Abstract】 Proton exchange membrane fuel cells use reforming gas as fuel widely, which always may contain certain amount of carbon monoxide(5×10-5-10-2). CO can strongly adsorb on the Pt catalyst surface and cause consider- able cell performance losses. In order to improve PEMFC CO tolerance, a novel PEMFC anode configuration was proposed. A layer of catalyst was placed on the gas diffusion layer, close to the anode flow field. With a small amount of air (2%) injection, this novel anode configuration can enhance PEMFC CO tolerance, and avoid local high temperature that may damage fuel cell membranes and reduce life.更多还原