Electrochemical gas sensor, liquid electrolyte and use of a liquid electrolyte in an electrochemical gas sensor

A liquid electrolyte for an electrochemical gas sensor comprising a housing, a working electrode, a counterelectrode, a reference electrode, wherein the housing has an electrolyte reservoir, a gas inlet opening and at least one gas outlet opening, a liquid electrolyte in the electrolyte reservoir and a counterelectrode carrier, the counterelectrode being suspended on the counterelectrode carrier such that the counterelectrode is suspended in the electrolyte reservoir and the electrolyte flows around the counterelectrode on all sides, wherein the electrolyte contains at least one conductive salt, a solvent and an organic mediator, wherein the electrolyte contains, furthermore, a buffer, said buffer being a compound according to

• R1—(CR2R3)n—SO3H, Formula I
• in which one of:
• n=1, 2, 3, 4 or 5, preferably n=2 or n=3, wherein R2 and R3 are selected, independently from one another, from among H, NH and OH, and wherein R1 is selected from the group containing piperazinyl, substituted piperazinyl, N-morpholino, cycloalkyl, tris-(hydroxyalkyl)alkyl;
• and
• n=2 or n=3, wherein all R2 and R3 are selected, independently from one another, from among H, NH and OH, and wherein R1 is selected from the group containing [4-(2-hydroxyethyl)-1]-piperazinyl, (N-morpholino)-, N-cyclohexyl-, tris-(hydroxymethyl)methyl, wherein the conductive salt contains an ionic liquid and wherein the solvent is selected from among water, propylene carbonate, ethylene carbonate or mixtures thereof.