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循环伏安实验显示,缺位磷钨杂多阴离子PW11O37-9的酸性水溶液在玻碳(GC)电极上有两对可逆的还原-氧化波.第一对波的电荷迁移数为1.4,有2个质子参与反应;第二对波的电荷迁移数为1.0,参加电极反应的质子数为1.根据峰电流与电位扫描速率平方根的关系得到PW11O37-9在0.1mol·L-1NaOAc+HOAc溶液中的扩散系数Do为3.54×10-6cm2·s-1.交流伏安和交流阻抗实验表明,PW11O37-9的电极过程包含吸附和脱附步骤,第一对波的电荷迁移阻抗较大,第二对波的较小,对应的交换电流密度i0分别为4.6×10-5和6.7×10-4A·cm-2.PW11O37-9电极过程的可逆性及其缺位特性使它对H2O2的还原有显著的电催化作用,因此有望用于有机物的氧化和降解.同时,还提出了一个相关的电催化机理.
Cyclic voltammetry showed that there were two pairs of reversible reduction-oxidation waves on the glassy carbon (GC) electrode in the acidic aqueous solution of vacancy phosphine-tungsten heteropolyanion PW11O37-9.The first charge had a charge transfer number of 1.4 and two A proton involved in the reaction; the second wave of the charge transfer number 1.0, to participate in the electrode reaction proton number 1. According to the peak current and potential scan rate square root relationship obtained PW11O37-9 in 0.1mol · L-1NaOAc + HOAc solution The diffusion coefficient Do is 3.54 × 10-6cm2 · s-1. The AC voltammetry and AC impedance experiments show that the electrode process of PW11O37-9 contains the adsorption and desorption steps, the first wave has a larger charge transfer resistance, and the second The smaller the wave, the corresponding exchange current density i0 were 4.6 × 10-5 and 6.7 × 10-4A · cm-2. PW11O37-9 electrode reversibility of the electrode process and its lack of characteristics so that it has the reduction of H2O2 A significant electrocatalytic effect, it is expected to be used for the oxidation and degradation of organic matter.At the same time, also proposed a related electrocatalytic mechanism.