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Acceleration by Adsorbed Sulphur and Selenium of the Electrochemical Oxidation of Formic Acid on Platinum Catalysts

Naturevolume 214pages268269 (1967) | Download Citation



THE anodic oxidation of formic acid to carbon dioxide on platinum electrodes in acid electrolyte is strongly inhibited. This is caused by the firm adsorption of formic acid or one of its reaction products on the platinum surface1–4. At low potentials the oxidation rate (current density) decreases with time from a high initial value to a low equilibrium value. At this stage adsorbed hydrogen atoms can no longer be detected on the platinum surface. Only at potentials in excess of 300 mV does the oxidation proceed at an appreciable rate. At 70° C the polarization is approximately 100 mV smaller than at 30° C (Fig. 1).

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  1. 1

    Brummer, S. B., and Makrides, A. C., J. Phys. Chem., 68, 1448 (1964).

  2. 2

    Breiter, M. W., Electrochim. Acta, 10, 503 (1965).

  3. 3

    Vielstich, W., and Vogel, U., Ber. Bunsengesell., 68, 688 (1964).

  4. 4

    Giner, J., Electrochim. Acta, 9, 63 (1964).

  5. 5

    Binder, H., Köhling, A., Krupp, H., Richter, K., and Sandstede, G., Chem. Eng. News, 42 (May 18, 1964); J. Electrochem. Soc., 112, 355 (1965).

  6. 6

    Binder, H., Köhling, A., and Sandstede, G., Adv. Energ. Conv. (in the press).

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  1. Battelle-Institut E.V., Frankfurt am Main

    • H. BINDER
    • , A. KÖHLING
    •  & G. SANDSTEDE


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