Intensification of the Nitrate Anion Reduction on a Membrane Palladium Electrode |
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Authors: | O A Petrii Yu A Akbaeva T Ya Safonova V S Kondrasheva E N Kolosov G A Tsirlina V M Gryaznov |
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Institution: | (1) Moscow State University, Leninskie gory, Moscow, 119899, Russia;(2) Russian State Peoples' Friendship University, ul. Miklukho-Maklaya 6, Moscow, 117198, Russia |
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Abstract: | Polarization curves of electroreduction of nitrate anions in sulfuric acid aqueous solutions on a Pd/Pd palladium electrode with the opposite side kept at different constant potentials in the region of Pd–H -phase formation are compared. The reduction rate of nitrate anions is shown to be substantially higher on a membrane electrode, provided the conditions of hydrogen supply from the membrane's opposite side to the reaction zone are realized. This phenomenon is caused by the reduction of a chemisorbed intermediate (a certain N(III) form) by hydrogen diffused through the membrane. It is shown that the measurements of hydrogen diffusion currents through a membrane can be used in plotting hydrogen sorption isotherms in the Pd–H -phase. |
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