A new high performance, low cost heterogeneous composite bipolar plate has been developed. Unlike the well publicized carbon composite bipolar plate, in which graphite powder and plastics are mixed thoroughly, the new plate has its “ribs” made of flexible and loose carbon fiber bunches while the rest of the plate is plain plastic. This design has brought many advantages: low contact resistance acquired under very low compression force, less stack weight and volume, full electrode utilization, and thus high performance and low cost. It also eliminates the need for supplementary devices for fuel circulation among cells in a stack and makes DMFC portable.

In this study, the effects of calcination temperature on the characteristics of tungsten trioxide (WO 3 ) nanofibers over time were explored. The objective being to observe the effects of calcination temperature and time of exposure on nanofibers when the voltage, work flow rate, and the pinhead used in the process were all fixed. The results showed that when the calcination temperature was increased to 550 °C, fiber structure was damaged. The nanofibers showed the selectivity about 9% at 360 ppm of ethanol gas. The response of ethanol will increase when the concentration increase.