Method for preparing composite material of polypyrrole granules and titanium dioxide nanotube array

The invention discloses a method for preparing a composite material of polypyrrole granules and a titanium dioxide nanotube array. The method comprises the following steps of: (1) synthesizing a titanium dioxide nanotube array and roasting to obtain an anatase type titanium dioxide nanotube array; and (2) electrochemically polymerizing the roasted titanium dioxide nanotube array as a working electrode and a platinum electrode as an auxiliary electrode for 15-120 min under the condition of controlling the voltage to be 0.8-1.0V in an aqueous solution consisting of sodium dodecyl benzene sulfonate and pyrrole monomers to obtain a finished product of the composite material of the polypyrrole granules and the titanium dioxide nanotube array. In the invention, the nano polypyrrole granules are loaded on the titanium dioxide nanotube array by utilizing a constant potential, an implementation method is simple and convenient with the characteristics of low cost and is easy for operation, and the prepared composite material has important application in many high-tech fields such as high-performance catalysts, solar batteries, photoelectrocatalysis, and the like.