How to make Ag-doped WO3 nanopowder exhibit higher photocatalytic activity?
Experts say that the direction of the built-in electric field on the surface of Ag doped tungsten trioxide nano powder can be achieved from bottom to top. As the positive and negative applied electric field is consistent with the direction of the built-in electric field, it is more favorable for the separation of the photo-induced electrons and holes, so that the Ag doped tungsten trioxide nano particles exhibits higher photocatalytic activity.
More details, please visit:
http://www.tungsten-powder.com/tungsten-oxide.html
Experts also say that tungsten trioxide is a semiconductor material. And the photoelectrocatalysis of semiconductor is an effective method to increase the activity of photocatalysts. The method constructs an auxiliary electric field by applying an external bias voltage, so the photogenerated electrons leave the surface of the catalyst under the action of an external electric field. And therefore the "long distance" of the photogenerated electrons and the holes are separated, thereby reducing the recombination rate of electrons and holes, and improving the photocatalytic efficiency of material.
