Phosphomolybdate-modified multi-walled carbon nanotubes as effective mediating systems for electrocatalytic reduction of bromate

摘要

Electrocatalytic properties(towards reduction of bromate in 0.5 mol dm~(-3)H2SO4)of multi-walled carbon nanotubes(CNTs)modified with phosphododecamolybdate(PM012)monolayers have been diagnosed using cyclic voltammetry and amperometry.The ability of negatively charged PMo_(12)-modified CNTs to attract electrostatically ultra-thin,positively charged conducting polymer(PEDOT or polypyrrole)structures is explored to grow in controlled manner hybrid organic-inorganic network electrocatalytic films.Due to the presence of three-dimensionally distributed CNTs,the films'conductivity and porosity are improved.The hybrid systems utilizing polypyrrole,rather than PEDOT,have produced fairly higher bromate electroreduction catalytic currents.Comparison is also made to Nafion-stabilized dispersion of PMo_(12)-modified CNTs inks.The latter system is characterized by good stability and relatively the highest sensitivities with respect to bromate concentration.