Electrochemical formation of ion-conducting oxo-phosphate-molybdate polymer on aluminium
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The state of theelectrochemical behavior of the Al electrode in aqueous solutions containing Na2MoO4 + H3PO4 + chitosan was investigated by methods of currentless chronopotentiometry, chronoamperometry, optical and scanning electron microscopy.The modification of the surface polymolybdate phosphate layers was carried out in a potentiostatic mode in the potentials rangefrom –1 to –3 V and polarization time (15…90 min). The elemental compositionof the surface layer of the metal before and after cathodic polarization are investigated.The electrochemical formation of matrix polymeric structures from ion-conducting (H+, Na+) heteronuclear polymolybdate and polyphosphate-molybdate complexes of double salts Na6AlnMo7–nO24and Na2yAl2(MoO4)y(PO4)3–ywas established.The rate of hydrogen and sodium intercalationinto the structure of the polyoxophosphate-molybdate layer increases sharply with an increase of the potential range from –1.3 V to –3.0 V. The addition of chitosan into the solution enhances the film-forming effect of surface ion-conducting oxo-phosphate – molybdate polymeric layer .
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