ELECTROCHEMICAL REACTIONS OF ETHENE ON POLYCRYSTALLINE AU ELECTRODES IN ACID-SOLUTION STUDIED BY DIFFERENTIAL ELECTROCHEMICAL MASS-SPECTROMETRY AND ISOTOPE LABELING
E. Pastor et Vm. Schmidt, ELECTROCHEMICAL REACTIONS OF ETHENE ON POLYCRYSTALLINE AU ELECTRODES IN ACID-SOLUTION STUDIED BY DIFFERENTIAL ELECTROCHEMICAL MASS-SPECTROMETRY AND ISOTOPE LABELING, Journal of electroanalytical chemistry [1992], 383(1-2), 1995, pp. 175-180
The electro-oxidation and electroreduction of ethene on polycrystallin
e Au were studied by means of differential electrochemical mass spectr
ometry (DEMS). It was found that the electroreduction of ethene in 0.1
M HClO4 + H2O yielded ethane whereas in DClO4 + D2O deuterated ethane
C2H4D2 was detetected. The electro-oxidation of C2H4 was accompanied
by a large signal for m/z = 44 in the mass spectrometer owing to the f
ormation of both CO2 and acetaldehyde. Using C2D4 in H2O + HClO4 the p
roduction of CO2 and ethanal was distinguished. Experiments with C2H4
in DClO4 + D2O demonstrated that all hydrogen atoms in ethanal belong
to the initial C2H4 molecule, thus indicating an internal rearrangemen
t during ethene electro-oxidation.