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Initial ATR-FTIR spectra acquired ca. 2 s after admission of 0.1 M H2- or D2-formaldehyde solution in 0.5 M HClO4 to a film Pt electrode at: 0.0 V (a) and 0.4 V (b) at 23 and 3 °C; at 0.0, 0.1, 0.2, 0.3 and 0.4 V for 0.1 M D2- (c) or H2-formaldehyde (d) at 3 °C temperature (see figure for notations).
