Development of a planar mu DMFC operating at room temperature

作者：D'Urso C^*; Baglio V; Antonucci V; Arico A S; Specchia S; Icardi U A; Saracco G; Spinella C; D'Arrigo G

来源：International Journal of Hydrogen Energy, 2011, 36(13): 8088-8093.

DOI：10.1016/j.ijhydene.2011.01.109

• Direct methanol fuel cells
• Planar design
• Flow field
• Methanol cross-over

A co-planar micro Direct Methanol Fuel Cell (p.DMFC) configuration was designed, developed and tested. The system geometry consisted of anodic and cathodic micro-channels arranged in the same plane. Firstly, micro-channels for a uniform distribution of oxygen and methanol were designed and realized on a polymeric substrate of polycarbonate. Then, the deposition of the catalytic elements inside the micro-channels by a spray-coating technique was carried out. Micro-channels were then covered by a catalyzed membrane containing separate anode and cathode layers. Different cell configurations were built, tested and evaluated. It was observed that the open circuit voltage varied significantly as a function of the membrane humidification degree and distance between anode and cathode channels in this planar design. In the presence of a large distance between the anode and cathode channel, the OCV reached 0.97 V. This high OCV reflected the absence of methanol cross-over due to the specific planar configuration. Regrettably, the overall cell impedance (ohmic and polarization resistance) limited the performance. A maximum power density of 1.3 mW cm(-2) (active area) was achieved at room temperature with the smallest distance between anode and cathode (0.25 mm).

• 出版日期2011-7