Gold Nanoparticles Supported on Nb2O5 for Low-Temperature CO Oxidation and as Cathode Materials for Li-ion Batteries
Gold Nanoparticles Supported on Nb2O5 for Low-Temperature CO Oxidation and as Cathode Materials for Li-ion Batteries
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DOI：
10.1016/j.apcata.2020.117747
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发表时间：
2020-08-05
影响因子：
5.5
通讯作者：
Ishida, Tamao
中科院分区：
文献类型：
--
作者：
Dien, Luong Xuan;Truong, Quang Duc;Ishida, Tamao
采用溶胶-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。采用固相研磨法制备了以Nb 2 O 5为载体的金纳米粒子。Au/Nb_2 O_5（含非晶相）催化剂对CO氧化的催化活性高于其它Au/Nb_2 O_5多晶型催化剂。对于锂离子电池正极材料的电化学性能，Nb 2 O 5（TT）表现出208 mA h g（-1）的高容量，而在Nb 2 O 5（TT）上沉积Au使容量提高到232 mA h g（-1）。容量与CO氧化活性相关，Au/Nb 2 O 5催化活性越高，放电容量越大。从表征结果来看，Nb 2 O 5（TT）中含有氧空位（Nb 4+位），其氧空位对CO的氧化和锂离子电池的性能起着重要的作用。
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.