Hydrogen permeation in PEM electrolyzer cells operated at asymmetric pressure conditions
Hydrogen permeation in PEM electrolyzer cells operated at asymmetric pressure conditions
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DOI：
10.1149/2.0221611jes
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发表时间：
2016
影响因子：
3.9
通讯作者：
P. Trinke;B. Bensmann;S. Reichstein;R. Hanke‐Rauschenbach;K. Sundmacher
中科院分区：
文献类型：
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作者：
P. Trinke;B. Bensmann;S. Reichstein;R. Hanke‐Rauschenbach;K. Sundmacher
本论文研究了 PEM 水电解过程中氢气通过 fumea EF-40 催化剂涂层膜的渗透情况。渗透的特征在于跨膜的不同温度和不同压力梯度。测量的渗透通量显示出与压力差的二次相关性。结合扩散和对流传输的渗透模型可以定量描述实验数据。确定60℃时的扩散渗透系数K P, diff eff= 2.95× 10− 14 mol/(ms Pa) ，其温度依赖性与文献值非常吻合。提出了膜的对流渗透系数来描述二次相关性。所获得的60℃下的对流渗透系数K P, conv eff= 9.02× 10− 21 mol/(ms Pa 2) 表明与最近报道的值相比具有较高的水力渗透率。这种高水渗透率尤其可归因于所研究的膜的低当量重量。此外，操作条件被怀疑支持渗透。
The present contribution investigates the hydrogen permeation through a fumea EF-40 catalyst coated membrane during PEM water electrolysis. The permeation is characterized at different temperatures and different pressure gradients across the membrane. The measured permeation fluxes show a quadratic dependence on the pressure difference. A permeation model combining a diffusive and convective transport can describe the experimental data quantitatively. The determined diffusive permeability coefficient K P, diff eff= 2.95× 10− 14 mol/(ms Pa) at 60 C and its temperature dependence agrees very well with literature values. A convective permeability coefficient of the membrane is proposed for the description of the quadratic dependence. The obtained convective permeability coefficient K P, conv eff= 9.02× 10− 21 mol/(ms Pa 2) at 60 C indicates a high hydraulic permeability in comparison with recently reported values. This high hydraulic permeability can be attributed especially to the low equivalent weight of the investigated membrane. Additionally, the operating conditions are suspected to support permeation.