“…5,6 Among these compounds, Ti 4 O 7 attracts the most attention in the fields of lithium-sulfur batteries, 7,8 photocatalysis, 9 electrocatalytic, 10,11 and thermoelectric 12,13 due to its extremely high electrical conductivity (~1995 S/cm 14 ) and excellent electrochemical properties. [15][16][17] Various studies have been conducted to prepare Ti 4 O 7 with different microstructures, including spheroid, 18 nanowires, 19 and nanotubes, 20 etc Carbothermal reduction reaction (CRR) is widely used to synthesis Ti 4 O 7 by using TiO 2 and carbon as titanium source and reducing agent, respectively, because of their advantages of low cost, abundance, and environment-friendly. 21 However, the phase evolution and microstructures during the CRR preparation process lack deep investigation, and there are seldom publications focused on the reaction mechanism of the fabrication process.…”