1962•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Requires access
EFFECT OF X-RADIATION ON THE ELECTROCHEMICAL OXIDATION OF FORMIC ACID ON Pt ELECTRODE
П.И. Дoлин, D.V. Kokoulina, S.A. Brusentseva, S. A. Kabakchi
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Abstract
Many electrochemical oxidation reactions are kinetically inhibited on Pt anodes and necessitate further work for the complete understanding of the inhibiting mechanism in order to eliminate it. In view of the known effect of ionizing radiation on dilute aqueous solutions, resulting in the formation of radiolytic products, such as H/sub 2/ and H/sub 2/O/sub 2/ together with short- lived atomic H and OH radical, the anodic oxidation of formic acid on a rotating Pt electrode under the influence of x radiation was polarographically investigated. Solutions containing lN H/sub 2/SO/sub 4/ and various amounts of HCOOH were used for the experiments carried out at 26 to 27 deg C at dose rates of 5.04x l0/sup 16/ and 5.02x 10/sup 17/ ev/cm/sup 3/ min. Three maxima, at 0.55, 0.9, and 1.5 v, and corresponding minima were noted on the polarogram. The first maximum was found to increase with increasing dose, reaching a stationary level at the 0.5 x l0/sup 19/ to 1.1 x l0/sup 19/ ev/cm/sup 3/ range. Saturation of the unirradiated solution with N/sub 2/ resulted in a higher value of the first maximum than saturation with air, due to the reduction of O/sub 2/ in the latter case. Upon irradiationmore » in a N/sub 2/ atmosphere, the first maximum was decreased, probably because of the poisoning of the Pt electrodc with the radiolytic formaldehyde. The increase of the third maximum upon irradiation is explained by the oxidation of the radiolytic H/sub 2/O/sub 2/; a similar effect was noted when H/sub 2/O/sub 2/ was added to unirradiated solutions. In addition to effects due to radiation, the excitation of photoconductivity of the surface oxide layer is partially responsible for the increase of the maximum. (TTT)« less