Mesoporous Anatase TiO2 Nanorods as Thermally Robust Anode Materials for Li‐Ion Batteries: Detailed Insight into the Formation Mechanism

Uniformly mesoporous and thermally robust anatase nanorods were produced with quantitative yield by a simple and efficient one‐step approach. The mechanism of this process was revealed by insertion of Eu³⁺ cations from the reaction medium as luminescent probes. The obtained structure displays an unusually high porosity, an active surface area of about 300 m²g^?1 and a specific capacity of 167 mA h g^?1 at a C/3 rate, making it attractive as an anode electrode for Li‐ion batteries. An additional attractive feature is its remarkable thermal stability; heating to 400 °C results in a decrease in the active surface area to a still relatively high value of 110 m² g^?1 with conservation of open mesoporosity. Thermal treatment at 800 °C or higher, however, causes transformation into a non‐porous rutile monolith, as commonly observed with nanoscale titania.