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The immobilization of SiW_(12)O_(40)~(4-)in poly(4-aminoazobenzene)filmwas done by electrochemical method.According to the continuous cyclicvoltammograms of the modified electrode,it can be determined that SiW_(12)O_(40)~(4-)in the polymer is very stable.The paper reports the elecctrochemical pro-perties of the modified electrode,Moreover,it was found that the modifiedelectrode exhibits electrocatalysis for the reaction of oxygen.