Study on distribution characteristics of proton exchange membrane electrolytic cell
The distribution characteristics of water electrolysis have a significant impact on the performance of the electrolytic cell and its service life.Using partitioned printed circuit boards,the current density distribution and temperature distribution of the steady-state and dynamic processes of water electrolysis were in situ characterized,and the effect of mass transfer polarization on multiple physical fields under the influence of water flow and actual current density was analyzed.The results show that the current density distribution and temperature distribution are more uniform and stable when the electrolytic cell is in the control region of electrochemical polarization and ohmic polarization.When the cell is during the mass transfer limitations,the current density distribution is significantly different.The more severe the mass transfer limitations,the greater the difference in local current density distribution.The high temperature area of the corresponding temperature distribution gradually shifts from the inlet side to the outlet side with the increase of the water flow rate.In addition,the normalized current density distribution is used to analyze the variation of current density distribution in the dynamic process.The results show that the main reason for the change of distribution uniformity of the electrolytic cell is mass transfer polarization.During the occurrence of mass transfer polarization,the low current density region near the downstream outlet area gradually increases,and finally forms the distribution characteristics of stable mass transfer polarization.
proton exchange membrane electrolytic cellcurrent density distributiontemperature distributionhydrogen productionmass transfer
万方数据
维普
