叠层扩散层对质子交换膜电解池性能影响的实验研究

Experimental Study on the Effects of Stacked Diffusion Layer on the Performance of Proton-Exchange Membrane Electrolysis Cells

质子交换膜电解水制氢技术的发展受到成本的约束。通过提高电流密度以提高单位质子交换膜电解池的氢产量可以降低单位应用成本,但高电流密度下电解池内部传质过电势的升高会导致制氢效率的下降。本文从降低质子交换膜电解池在高电流密度下的传质过电势入手,设计了有利于传质的“钛毡–钛网”式叠层扩散层结构,并进行对照实验分析了不同扩散层结构对电解池性能的影响规律。实验证明,钛毡叠加30目钛网的叠层扩散层结构可以使高电流密度(5 A/cm2)下的传质过电势降低至0.25 V(与钛毡或30目钛网作为扩散层相比,传质过电势分别降低了0.24 V与0.55 V),本项工作也为后续扩散层结构的优化提供了思路。

The development of hydrogen production technology by proton-exchange membrane electrolysis cells is limited by its high application cost.Increasing the current density to increase the hydrogen production of per unit device can reduce the unit application cost,but the increase of mass transport overpotential under high current density will lead to the decline of hydrogen production efficiency.In this paper,starting with reducing mass transport overpotential of proton-exchange membrane electrolysis cells under high current density,a”titanium felt-titanium mesh”stacked diffusion layer is designed to improve the mass transport performance,and the effects of different diffusion layers on the performance of electrolysis cells were analyzed by comparative experiments.Experiment results show that the mass transport overpotential under high current density (5 A/cm~2)can be reduced to 0.25 V by stacking 30 mesh titanium mesh on titanium felt (compared with single-layer titanium felt and 30 mesh titanium mesh,the mass transport overpotential was reduced by 0.24 V and 0.55 V,respectively).This work also provides ideas for the subsequent optimization of the diffusion layer.