Differential Electrochemical Mass Spectrometer
Wei Li and the Differential Electrochemical Mass Spectrometer (DEMS). Mass flow controllers feed oxygen and hydrogen to a PEM fuel cell. The fuel cell is controlled by a sophisticated potentiostat that can measure the voltage as a function of current. The cathode exhaust is connected to a Hiden mass spectrometer to identify and quantify the gasses evolving from the fuel cell reactions.