Study on heat generation and temperature distribution in proton exchange membrane electrolysis cell
In view of the problem that proton exchange membrane electrolysis cell(PEMEC)is often regarded as isothermal state in numerical simulation,a steady state,three-dimensional,two-phase and non-isothermal single-channel PEMEC model was established.The influence of isothermal model and non-isothermal model on the simulation results was studied,and the law of heat generation and temperature distribution of the PEMEC were analyzed.The results show that the non-isothermal model can simulate the performance of PEMEC more accurately.Under the same operating voltage,the current density calculated by the non-isothermal model is higher than that of the isothermal model,and the higher the operating voltage,the greater the difference between the two.When the temperature is higher than 1.4 V,the total heat generation increases in a parabolic trend,and the heat generation ratio of anode catalytic layer(ACL),cathode catalytic layer(CCL)and proton exchange membrane(PEM)exceeds 98%,and the heat generation density of ACL is higher than that of PEM and CCL.Compared with supplying water only on the anode side,at 2.2 V,using cathode co-flow and counter-flow water supply reduces the temperature uniformity of the membrane electrode assembly from 0.44%to 0.16%and 0.14%,respectively,and the maximum temperature difference decreases from 12.25 K to 4.13 K and 3.69 K.
proton exchange membrane electrolysis cellhydrogen production by water electrolysisheat generationtemperature distributionnon isothermal modelhydrogen energy
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