Rational Synthesis of Coaxial MoO₃/PTh Nanowires with Improved Electrochemical Cyclability

摘要

It is of great interest to fabricate heterostructured nanowires and make full use of the synergistic effectin improving the performance of Li-ion battery electrode materials. Here we designed anddemonstrated the synthesis of MoO3/PTh coaxial nanowires via in-situ polymerization of thiophenemonomers on the surface of hydrothermally synthesized MoO3 nanowires. The resulting coaxialnanowires were characterized by X-ray Diffraction, Fourier Transform Infrared Spectroscopy, FieldEmission Scanning Electron Microscopy, Thermogravimetric Analysis and electrochemicalperformance test. The results indicate the homogeneous layer of PTh is coated on the surface of MoO3nanowires, and the coaxial nanowires exhibit a significant enhancement of capacity retention rate from49% of MoO3 nanowires to 83% of MoO3/PTh coaxial nanowires after 45 cycles. The theoreticalanalyses of a certain amount of capacity reduction after PTh coating are given.