Figure 2: Cyclic voltammograms scanned on a polycrystalline Pt wire electrode in alkaline (0.1 M KOH, dashed lines) solution and in admixture of formaldehyde (0.01 M (a) and 0.1 M HCHO (b), full lines) at 200 mV·s−1 sweep rate between hydrogen and oxygen potential evolving limits. Labels: (A) reversible hydrogen adsorption peak; (B) irreversible Pt surface oxide (Pt=O) desorption peak; (C, D) successive peaks of anodic aldehyde oxidation; (E) sudden sharp current jump and reverse peak of repeated HCHO oxidation; (G, F) reversible H-adatoms oxidation and desorption peaks [38].