关键词: PEM燃料电池, 旋转磁场, 旋转速度, 工作性能

Abstract: Proton Exchange Membrane (PEM) fuel cell performance may be improved by application of additional magnetic fields. In this work, one square permanent magnet, made of either 16 combination cylinder magnets with homopolarity or 16 combination cylinder magnets with heteropolarity, was exerted on the fuel cell surface to produce additional magnetic field affecting PEM fuel cell performance. The influences of magnetic field status (rotating, static and none) on polarization and power density curves measured in a PEM fuel cell were investigated. The results verified the benefit of magnetic field, proving that the magnetic field distribution could improve the fuel cell output. Especially, the rotating combination magnet with heteropolarity enlarged the power density by 21.27%, which has advantage to the static magnetic field of 11.70% enhancement. Finally, the rotating speed was related to the fuel cell output power. High rotating speed was beneficial to the performance improvement, and the maximum power density was obtained at 30 r·min^-1. However, the performance became worse upon further acceleration.

Key words: PEM fuel cell, rotating magnetic field, rotating speed, performance