Transient analysis of passive vapor-feed DMFC fed with neat methanol. (2nd February 2017)

• Record Type: Journal Article
• Authors: Guo, Ting; Sun, Jing; Zhang, Junfeng; Deng, Hao; Xie, Xu; Jiao, Kui; Huang, Xuri
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 5(2017)
• Page Start: 3222
• Page End: 3239
• Publication Date: 2017-02-02
• Subjects: Passive vapor-feed direct methanol fuel cell -- Neat methanol -- Open area ratio -- Fuel efficiency -- Energy density -- Energy efficiency; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.10.122
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A transient model is presented to investigate the transport phenomena for passive vapor-feed direct methanol fuel cell (DMFC). The pervaporation membrane and vapor transport layer are considered for the formation and transport of methanol vapor, respectively. We attempt to provide insight into the transient mass transport characteristics of DMFCs by testing different operation conditions, including current density, open area ratio of the vaporizer, and membrane thickness. The results show that the methanol crossover rate and water transport from the cathode to the anode are the key factors for improving the cell performance, and indicate that fuel efficiency, energy efficiency and energy density of the DMFCs are improved by increasing current density, decreasing open ratio of the vaporizer or increasing membrane thickness due to the reduced methanol crossover rate. The cathode micro-porous layer (MPL) is useful in enhancing water recovery flux and decreasing water losses. Highlights: A transient model for passive vapor-feed DMFC is developed. Cathode water recovery is critical when neat methanol vapor is supplied. Cathode MPL is beneficial to water recovery from cathode to anode. Increasing current and membrane thickness help reduce methanol crossover. Decreasing vaporizer open ratio generally has positive impact.