摘要
模拟了质子交换膜燃料电池(PEMFC)的膜中水传递、反应气体传质和电化学反应过程,研究了液态水对阴极氧气传输阻力和燃料电池电化学性能的影响。计算结果表明,催化层,尤其是催化层中气相和电解质相界面是影响氧气传质阻力的重要因素。液态水膜会由于氧气极低的溶解度而显著增加氧气传质阻力,降低燃料电池的电化学性能,并且,其影响会随水膜厚度和对孔隙覆盖度的增加而明显增强。
A numerical model of a proton exchange membrane fuel cell(PEMFC) was developed to simulate the transport of water and reactant gases within the gas channels and the membrane electrode assembly as well as the electrochemical reaction. Effects of liquid water in cathode on oxygen transport and electrochemical performance of the fuel cell were modeled and evaluated. Results indicate that the significant obstacle of liquid water film to oxygen transport, which resulting in the obvious degradation in performance of the fuel cell is ascribed to the extremely low solubility of oxygen in liquid water. The increasing effects of liquid water on fuel cell performance are detected as water film becomes thicker and covers more gas pores.
出处
《电源技术》
CAS
CSCD
北大核心
2004年第5期295-299,共5页
Chinese Journal of Power Sources
