In order to study the relationship between heat transfer and mass transport in fuel cell

a micro thin film heat flux sensor

which can simultaneously measure the temperature and heat flux inside the fuel cell

has been designed and fabricated.The results show that the self-made sensor can detect the transient temperature and heat flux on the surface of membrane electrode assembly(MEA)and the sensor is slightly affect the performance of fuel cell.The simultaneous measurement indicates that the dynamic response of temperature is slower than that of heat flux during the fuel cell discharge process.The heat flux appears to be constantly changing with respect to temperature because of the variation of heat conductivity coefficient of MEA and the effect of methanol crossover.