Synthesis of alpha-MnO2 nanowires modified by Co3O4 nanoparticles as a high-performance catalyst for rechargeable Li-O-2 batteries
Synthesis of alpha-MnO2 nanowires modified by Co3O4 nanoparticles as a high-performance catalyst for rechargeable Li-O-2 batteries
复制标题
Co3O4 纳米粒子修饰的 α-MnO2 纳米线的合成作为可充电 Li-O-2 电池的高性能催化剂
DOI：
10.1039/c5cp06815k
复制
发表时间：
2016
影响因子：
3.3
通讯作者：
Liu Jianjun
中科院分区：
文献类型：
--
作者：
Wang Fan;Wen Zhaoyin;Shen Chen;Wu Xiangwei;Liu Jianjun
制备了均匀包覆Co 3 O 4纳米粒子的α-MnO 2纳米线，作为可充Li-O2电池的双功能催化剂。α-MnO 2纳米线直径为5-20 nm，长度为5 ~ 10 μm。包覆后的Co 3 O 4纳米粒子直径约为5 nm。α-MnO 2/Co 3 O 4杂化物具有329.5 cm 2 g-1的高比表面积，显示出优异的催化性能。电池的充放电过电位均得到有效降低，电池可稳定工作60次以上。结果表明，α-MnO 2/Co 3 O 4杂化材料的催化性能不仅与催化剂的形貌和尺寸有关，还与二者的协同作用以及MnO 2表面产生的氧空位有关。充放电循环测试结果表明，该复合催化剂是一种很有前途的锂氧电池催化剂。
The α-MnO2 nanowires uniformly coated with Co3O4 nanoparticles were prepared as a bi-functional catalyst for rechargeable Li–O2 batteries. The α-MnO2 nanowires were 5–20 nm in diameter, ranging between 5 and 10 μm in length. And the coated Co3O4 nanoparticles were around 5 nm in diameter. The α-MnO2/Co3O4 hybrid had a high specific surface area of 329.5 cm2 g−1, and showed excellent catalytic property. Both of the charge and discharge overpotentials are effectively reduced and the batteries could stably work for more than 60 cycles. It is demonstrated that the catalytic performance of the α-MnO2/Co3O4 hybrid is not only associated with the morphology and size of the catalyst, but also with their synergetic effects and the oxygen vacancies produced at the surface of MnO2. The results of charge–discharge cycling tests demonstrate that this α-MnO2/Co3O4 hybrid catalyst is a promising candidate for the Li–O2 batteries.