Fig. 2. Mass spectroscopic analysis of outlet stream under chronoamperometric measurements.

Mass spectroscopic analysis of the outlet gas stream during chronoamperometric measurements observed under various bias potentials with respect to the reference electrode: a −1.00 V, b −0.75 V, c −0.50 V, d −0.25 V, e 0.00 V, f 0.50 V, g 0.75 V, h 1.00 V, and i 1.20 V. The black and red curves indicate H₂ and H₂O, while green and blue curves indicate C₂H₄ and CO₂, respectively.