Ammonia is an important indicator of controlling impurities in hydrogen for proton exchange membrane fuel cell,but there are still some defects in current detection methods such as high detection limit or cumbersome pretreatment.To improve the detection sensitivity and efficiency,the method of cavity ring down spectroscopy was used to determine the trace ammonia in hydrogen for proton exchange membrane fuel cell.Results show that the test result was slightly affected by dead volume of pipeline and injection pressure,while the equilibration time was obviously affected by dead volume of pipeline and injection flow rate.This method exhibits excellent accuracy when the ammonia mole fraction is ranging from 0.01 to 10.20 μmol/mol,and is not interfered by conventional impurities such as water,hydrogen sulfide and carbon monoxide.As a simple,sensitive and accurate method for detection of ammonia,it is of certain significance in improving the hydrogen quality management system of fuel cell vehicles.
cavity ring down spectroscopyproton exchange membrane fuel cellhydrogenammoniatrace
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