Abstract
A monolayer of Keggin-type heteropolyanion [SiNi(H 2O)W 11O 39] 6− was fabricated by electrodepositing [SiNi(H 2O)W 11O 39] 6− on cysteamine modified gold electrode. The monolayer of [SiNi(H 2O)W 11O 39] 6− modified gold electrode was characterized by atomic force microscopy (AFM) and electrochemical method. AFM results showed the [SiNi(H 2O)W 11O 39] 6− uniformly deposited on the electrode surface and formed a porous monolayer. Cyclic voltammetry exhibited one oxidation peak and two reduction peaks in 1.0 M H 2SO 4 in the potential range of −0.2 to 0.7 V. The constructed electrode could exist in a large pH (0–7.6) range and showed good catalytic activity towards the reduction of bromate anion (BrO 3 −) and nitrite (NO 2 −), and oxidation of ascorbic acid (AA) in acidic solution. The well catalytic active of the electrode was ascribed to the porous structure of the [SiNi(H 2O)W 11O 39]6 − monolayer.
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