从图中能够看出随着修饰层数的增加，修饰电极中的氧化还原峰响应电流不断增

It can be seen from the figure that as the number of modified layers increases, the redox peak response current in the modified electrode continues to increase. When the number of modified layers is 5, the modification effect is the best, and when the number of modified layers exceeds 5, the modified electrode's The redox peak response current gradually weakened, which may be due to the gradual dissolution of polyoxometalates during the modification process. Therefore, the number of modified layers is preferably 5 layers.

It can be seen from the figure that with the increase in the number of decoration layers, the redox peak response current in the modification electrode is increasing, when the number of modified layers is 5 layers when the modification effect is best, the number of decoration layers more than 5 layers, the redox peak response current of the modified electrode gradually weakened, probably due to polyoxometalates in the process of decoration gradually dissolved off. So the decoration layer number is 5 layers as good.

It can be seen from the figure that with the increase of the number of modified layers, the redox peak response current in the modified electrode is continuously enhanced. When the number of modified layers is 5, the modification effect is the best. When the number of modification layers is more than 5, the redox peak response current of the modified electrode gradually decreases, which may be caused by the dissolution and shedding of polyxmetalates in the process of modification. Therefore, the number of modified layers is 5.<br>