K_3[Fe(CN)_6]溶液中普鲁士蓝修饰电极的制备及其对H_2O_2的电催化还原

应用循环伏安法和微分脉冲伏安法研究了K3Fe(CN)6]溶液中普鲁士蓝(PB)修饰电极的制备及其电化学行为。结果表明,在连续循环伏安扫描的条件下,K3Fe(CN)6]会在对电极上发生解离生成Fe3+,Fe3+可以跟单室电解池三电极体系中的Fe(CN)6]3-生成在Au电极表面有较强吸附作用的PB,所获得的PB修饰电极的稳定性受介质和外加电位的影响。修饰电极上的PB在c(KCl)=0 2mol/L中性或弱酸性溶液中于-0 10 5V较稳定,而在c(H2SO4)=1 0mol/L溶液中PB会在Au电极上溶出;于-0 11 5V扫描时PB也会在Au电极上溶出。尤为重要的是,所获得的PB修饰电极对H2O2的还原既有很好的间接电催化作用,又可以降低H2O2在其上反应的活化能,对H2O2还原反应的电子传递起到促进作用。

Preparation of Prussian Blue Modified Electrode in Solution Containing K3[Fe(CN)6] and Its Electrocatalytic Property to Hydrogen Peroxide Reduction

Formation and electrochemical behavior of Prussian blue (P B) modified electrode in solution containing K3 were investigated using cyclic voltammetry and differential pulse voltammetry. The experiments sh ow that the formation of PB film on a gold electrode in a single-compartment e lectrolytic cell can be achieved by the reaction between 3- a nd Fe3+ formed by the decomposition of K3 on the counter el ectrode with the continuous process of potential sweep.The stability of PB modif ied electrode is influenced by pH and potential. In the solution containing 02 mol/L KCl, when the potential is swept in the range of -01-05 V(vs.SCE) , the peak current keeps unchanged with the increase of the scan numbers.However ,in the solution containing 10 mol/L H2SO4,within -01-05 V or -01-1 5 V,PB is dissolved from the modified electrode.An excellent electrocatalytic property to hydrogen peroxide reduction was observed at PB modified electrode.