Synthesis of polypyrrole-titanium dioxide brush-like nanocomposites with enhanced supercapacitive performance

摘要

In this work, a kind of polypyrrole (PPy) layer-PPy nanowire-TiO2 nanotube brush-like composite has been successfully prepared. Highly ordered and free-standing TiO2 nanotube arrays were prefabricated via an anodizing method, pyrrole was then filled and polymerized in the nanotube arrays through an electrochemical deposition route to form a nanowire-in-tube structure together with a PPy layer outside. The morphology of the as-prepared hybrid nanostructure was observed by scanning electron microscope (SEM), the PPy filling in the TiO2 nanotube was confirmed by Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. When investigated as an anode material for supercapacitors, the as-obtained PPy/TiO2 could deliver a capacity of 446 F g(-1) at a current density of 15 A g(-1) even after 1000 cycles, which is much higher than individual TiO2 nanotubes and PPy, respectively. The smart nanostructure of the PPy/TiO2 nanocomposites makes a prominent contribution to the excellent electrochemical performance.