| abstract |
A new electrochemical sensor for determining hydrogen peroxide concentration having a mixed-valence metal oxide of M x O y deposited on an electrode surface thereof is disclosed, wherein M is a transition metal and has two or more than two valences. M x O y , for example, is M 3 O 4 where M is Mn, Fe, Co or Pb, Tb 4 O 7 or Pr 6 O 11 . Further, this invention also discloses an electrochemical sensor for determining a concentration of a hydrogen peroxide precursor, wherein a catalyst is immobilized in the matrix or on the surface of the mixed-valence metal oxide on the electrode. In a typical biochemical system, the catalyst can be a glucose oxidase and blood glucose is catalyzed to form hydrogen peroxide, so that the concentration of blood glucose is determined. |