Functionalization of electrodes with polyoxometalates P2Mo18O626− and P2W18O626−

Synthesis of Polyoxometalate‐Protected Gold Nanoparticles by a Ligand‐Exchange Method: Application to the Electrocatalytic Reduction of Bromate

“…0.3 V for the reduction of 10 mM bromate in 0.5 M H 2 SO 4 at 50 mV s À1 was 2.2 times higher at GC j PMo 12 -AuNP than at GC j PMo 12 . Under these conditions, the mediated (by the first redox process of PMo 12 ) reduction of bromate is not diffusion-limited at the GC j PMo 12 electrode; the resulting low sensitivity the bromate reduction by the first redox process of PMo 12 when this species is directly adsorbed to an electrode is consistent with other reports [4,44]. At GC j PMo 12 -AuNP, a plot of log i p vs. log v has a slope of 0.6 from 25 -100 mV s À1 , which approaches a linear diffusion limit.…”

A Novel Sensor Based on Layer‐by‐Layer Hybridized Phosphomolybdate and Poly(ferrocenylsilane) on a Cysteamine Modified Gold Electrode

“…6b inset) with appearing potential at À 0.076 V. The parameters of chronoamperometric response are shown in Table 1. This result is coincident with previous work [42]. The catalytic reduction of IO Figure 6d inset I -C curve).…”

Electrochemical Detection of ClO$\rm{ {_{3}^{-}}}$, BrO$\rm{ {_{3}^{-}}}$, and IO$\rm{ {_{3}^{-}}}$ at a Phosphomolybdic Acid Linked 3‐Aminopropyl‐Trimethoxysilane Modified Electrode

“…4A). Other peaks (I and II) were almost unaffected by the addition of ClO This result is consistent with a previous work [20]. The catalytic reductions of BrO À 3 and IO À 3 were found to be related to the second (II) and first (I) redox pairs, respectively.…”

“…This result indicates that IO [19]. However, in that work, the catalytic reductions of ClO were observed to be associated with third and second redox processes, respectively, which are consistent with the previous results [20,21]. The different modification of the electrode using a sol -gel method might be altered the catalytic reduction of IO À 3 by second and third redox processes of PMO [19].…”

“…The entrapped heteropolyanion preserves its functional characteristics and usually does not leach out, providing a longterm operational stability. [20]. The incorporation of a heteropolyanion in a polymeric matrix often does not display the same electrochemical properties and therefore has a different electrocatalytic activity.…”