Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 87: Surface chemical reactions

O 87.1: Vortrag

Freitag, 30. März 2012, 10:30–10:45, MA 042

Detection of carbon monoxide in a hydrogen-rich atmosphere with Kelvin Probe measurements. — •Stefan Simon¹, Christoph Senft¹, Roniyus Marjunus^1,2 und Walter Hansch¹ — ¹Universität der Bundeswehr, München, Germany — ²University of Lampung, Bandar Lampung, Indonesia

For fuel cell applications, it is necessary to have a CO free hydrogen gas, because CO containments lead to a lower efficiency of fuel cells. It is possible to remove this carbon monoxide from the hydrogen gas by mechanisms called water gas shift reaction (WGS) or preferential oxidation catalyst (PROX). For these methods it is important, that the amount of CO has to be known. Therefore, a sensor which can detect CO in hydrogen and regulate these CO adsorption mechanisms would be a great advantage. A problem is that CO and H2 are both reducing gases. So the reaction for the two gases on top of the surface is in principle the same. In this talk a sensitive layer based on modified platinum is presented, which can detect carbon monoxide in a hydrogen-rich atmosphere. The detection mechanism is based on changing the work function by the gases, which is then measured with a kelvin probe system.