A composite film electrode PW

11

Fe/CS/CNTs/C was prepared by the integration of adsorption method and solgel method using chitosan as both an adsorbent and film-forming agent

Keggin type Fe(Ⅲ) substituted heteropolyanion PW

11

O

39

Fe(Ⅲ)(H

2

O)

4-

(PW

11

Fe) as an electrocatalyst

carbon nano tubes (CNTs) as a conductivity improver in this paper. The electrochemical behavior and its influence factors of the asprepared electrode were investigated by using the electrochemical method. The electrocatalytic activity towards H

2

O

2

reduction and the possibility also used to be an electrochemical sensor detecting H

2

O

2

were evaluated. The results showed that the PW

11

Fe/CS/CNTs/C composite film electrode possessed a similar electrochemical behavior with PW

11

Fe and a high electrocatalytic activity towards H

2

O

2

reduction. For detecting H

2

O

2

reduction. Applied to detect H

2

O

2

the electrode exhibits a high sensitivity of 0.30 mA·cm

-2

·(μmol/L)

-1

and a detection limit of 7.3 μmol/L (S/N=3).