A Partial Element Stage Cut Electrochemical Hydrogen Pump Model for
Hydrogen Separation and Compression
Abstract
In this work, a partial element stage cut electrochemical hydrogen pump
(EHP) model for multiple H2-contaning gases separation and hydrogen
compression which embed real factors (anode impurity diffusion, hydrogen
back-diffusion and anode catalyst deactivation) was established to study
EHP performance accurately under full hydrogen concentration. The
accuracy and reliability of proposed model were verified from four
aspects (current density distribution, polarization curve, hydrogen
recovery and purity) under different feedstock systems and wide pressure
range. The model has good applicability and accuracy (R^2≥0.96,
simulation and experiment results comparison). Simulation results show
that high hydrogen back-diffusion ratio can cause low energy efficiency
under high cathode pressure and low feedstock hydrogen content. The
variation law of hydrogen purity under multi-operating conditions was
studied, which shows dual-effect (PEM and GDL resistance) can affect
hydrogen purity prominently through current density under low feedstock
hydrogen content and applied potential.