Study of Electrochemical Hydrogen Separation Pump using Polymer Electrolyte Membrane

测定了选择性分离压缩氢的电化学氢泵的基本分离压缩特性。除H_2浓度较低和H_2输运率较高时外，用模拟程序计算的氢泵沿流动方向的电流分布与分段电极槽的实测电流分布基本一致。由此可以确定氢泵的基本操作。分离泵在H_2浓度为1%的常压下、压缩泵在阴极压力为1 MPa时，开路电压与能斯特电位吻合较好。当电池电压为0.06-0.15 V，电流效率接近100%时，几乎100%的H2可以被分离和压缩。此外，阳极排气中氢气的含量不超过50ppm。在压力比为10、电流密度为0.1A cm^<-2>的H_2压缩试验中，考虑过电位损失的压缩机功率等于100%绝热效率的压缩机功率。在今后的研究中，我们将进一步阐明电化学氢泵在低H2浓度和高H2输运速率下的特性。

The basic separation and compression characteristics were measured for an electrochemical hydrogen pump that can selectively separate and compress hydrogen. The current distribution along the flow direction calculated by our simulation code of hydrogen pump agreed well to the measured current distribution by a segmented electrode cell, except when H_2 concentration is low and H_2 transport rate is high. We could thus confirm the basic operation of hydrogen pump. In the separation pump operated under atmospheric pressure down to H_2 concentration of 1% and the compression pump up to cathode pressure of 1 MPa, the open-circuit voltage agreed well with the Nernst potential. almost 100% of supplied H2 could be separated and compressed with a cell voltage of 0.06-0.15 V and current efficiency near 100%. Moreover, the anode exhausted gas contains no more than 50ppm of Hydrogen. In the H_2 compression test with the pressure ratio of 10 and the current density of 0.1A cm^<-2>, the compressor power considering overpotential loss was equal to an adiabatic compression power with 100% adiabatic efficiency. In the future we would like to clarify further the characteristics of electrochemical hydrogen pumps for low H_2 concentration and high H2 transport rate.