Evaluation of hydrogen purity in hydrogen storage material by gas chromatography

Hydrogen is a clean, renewable energy source with low pollution. For its practical application, hydrogen storage material has been studied extensively, and the purity analysis for hydrogen in and released from the storage material has become very important. Here, a purity analysis method for hydrogen after storing in hydrogen storage material is developed. The results show that the common gaseous trace impurities in hydrogen except H2O can be detected with good sensitivity and repeatability; the impurities with a concentration of 0.02 mu mol/mol can be detected, and Relative Standard Deviation (RSD) < 5% can be obtained for a small peak area of lower than 40 pA.min. Additionally, the impact of matrix hydrogen to the final results also can be decreased significantly.