We prepared a series of Nb₂O₅ polymorphs by the sol-gel method and the sol-gel hydrothermal method. Gold nanoparticles supported on Nb₂O₅ were prepared by solid grinding method. Au on pseudohexagonal (TT-phase) Nb₂O₅ containing an amorphous phase exhibited higher catalytic activity for CO oxidation than did other Au/Nb₂O₅ polymorphs. For the electrochemical properties for cathode materials of Li-ion batteries, Nb₂O₅ (TT) exhibited high capacity of 208 mA h g^-1, and the deposition of Au onto Nb₂O₅ (TT) improved the capacity to 232 mA h g^-1. Capacity and CO oxidation activity were related; the higher the catalytic activity Au/Nb₂O₅ shows, the higher is the discharging capacity. From the characterization results, Nb₂O₅ (TT) contains oxygen vacancies (Nb⁴⁺ sites), and the oxygen vacancies of Nb₂O₅ (TT) would play an important role for CO oxidation and the performance for Li-ion batteries.

我们通过溶胶-凝胶法和溶胶-凝胶水热法制备了一系列Nb ₂ O ₅多晶型物。通过固体研磨法制备了负载在Nb ₂ O ₅上的金纳米颗粒。包含无定形相的准六方（TT相）Nb ₂ O ₅上的Au表现出比其他Au / Nb ₂ O ₅多晶型物更高的CO氧化催化活性。就锂离子电池正极材料的电化学性能而言，Nb ₂ O ₅（TT）表现出208 mA hg ^-1的高容量，并且Au沉积在Nb ₂ O _5上（TT）将容量提高到232 mA hg ^-1。容量与CO氧化活性相关；Au / Nb ₂ O ₅显示的催化活性越高，放电容量越高。从表征结果来看，Nb ₂ O ₅（TT）包含氧空位（Nb ⁴⁺位），Nb ₂ O ₅（TT）的氧空位将对CO氧化和锂离子电池的性能起重要作用。