Discharged Titanium Oxide Nanotube Arrays Coated with Ni as a High‐Performance Lithium Battery Electrode Material

Abstract

Transition metal oxides are in high demand as electrode materials for alkali metal‐ion batteries due to high theoretical capacity. However, low electron transfer kinetics and slow ion migration lead to poor cycle stability and rate performance of the transition metal oxide electrode. Herein, TiO2 nanotube arrays coated with Ni (Ni/TiO2NTs) are fabricated by using predischarge‐electrodeposition method and subsequent calcination under H2/N2. In the Ni/TiO2NTs composite, TiO2NTs and Ni nanoparticles play the role of framework and coating layer, respectively. The as‐prepared Ni/TiO2NTs composites have a high specific surface area and a unique tubular structure, which facilitates the quick penetration of the electrolyte into the tubes and reduces the lithium ions’ diffusion distance. The incorporation of Ti3+ and metallic nickel in the hydrogenated TiO2NTs also increases conductivity. Besides, the spin‐polarized surface capacitance of Ni0 nanoparticles causes the magnetic changes that generate an extra lithium‐ion storage capacity. The Ni/TiO2NTs composite electrode maintains a high capacity of 507 mA h g−1 after 100 cycles at 0.2 A g−1. Here, the predischarge‐electrodeposition provides a new route for the preparation of composite materials.

TiO2-Coated MoO3 Nanorods for Lithium/Sodium-Ion Storage

“…Additionally, the average pore size of the MoO 3 @TiO 2 -2 composite is 8.6 nm, revealing a mesoporous structure for these composites. The mesoporous structure facilitates the infiltration of electrolytes and promotes the diffusion of lithium ions. , This result indicates another reason for the enhanced performance of the MoO 3 @TiO 2 anode material. The thermogravimetric analysis (TGA) for the two based-MoO 3 composites is depicted in Figure f.…”

Enhanced photocatalytic performance of Ag nanoparticle–TiO2−X nanotube arrays obtained by a predischarge–deposition method and calcination in H2/N2

“…TiO 2 nanotubes were prepared using the twice-anodized method from previous work. 28 Using the pre-discharge electrodeposition approach, Ag nanoparticles were deposited onto the surface and interior walls of the TiO 2 nanotubes. Firstly, TiO 2 nanotube arrays were discharged to 0.01 V at a current density of 0.05 A g −1 in a detachable charge/discharge device.…”